您当前的位置:首页?>?期刊摘要?>?中英文摘要

2016年第9期

时间:2016-09-13 10:30:11??来源:??作者:

?ed7ag8879环亚手机|首页主页

宋汉戈1,刘世光1,2
1.天津大学计算机科学与技术学院,天津 3003502.天津市认知计算与应用重点实验室,天津 300350
摘要:三维流场可视化主要通过计算机图形学方法来描述复杂的流场结构,揭示流体内部规律和物理特征,在航空、气象、医学等领域具有重要意义。由于三维空间维度和数据量的影响,目前三维流场可视化中尚存在不少问题亟待解决。对三维流场可视化研究现状和方法进行了分类描述,从基于线的可视化、基于面的可视化、基于体绘制的可视化以及基于纹理的可视化等4个方面对当前的研究现状加以分析总结,介绍了各方面的研究进展和存在的问题。总结了三维流场可视化中的主要问题,并对未来工作提出了一些建议。
关键词:流场可视化;流线可视化;流面可视化;体绘制;纹理可视化
中图分类号:TP391.9????? 文献标识码:A??? ???文章编号:1004-731X (2016) 09-1929-08
review of 3D flow visualization
Song Hange1, Liu Shiguang1,2
(1. School of Computer Science and Technology, Tianjin University, Tianjin 300350, China;ed7ag8879环亚手机|首页主页
?2. Tianjin Key Laboratory of Cognitive Computing and Application, Tianjin 300350, China)
Abstract:3D flow visualization describes the complex flow structure by computer graphics methods, reveals the internal laws and physical characteristics of the fluid, and has an important role in the aviation, atmosphere, and medicine and so on. There are many problems to be solved in the 3D flow visualization because of the dimension and the data scale of the 3D space. The classification of the 3D flow visualization was showed by the research status and methods, which could be divided the line-based visualization, surface-based visualization, volume rendering and texture-based visualization. The progress and problems in the above aspects were analyzed. Some main problems in 3D flow visualization were showed and some advice for future work was provided.
Keywords: flow visualization; streamline visualization; surface visualization; volume rendering; texture-based visualization
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
基于产品装配模型的虚拟样机快速建模方法
王瑀,姚寿文,刘吉林,黄德智,张清华,伊然
(北京理工大学机械与车辆学院,北京 100081)
摘要:研究了装配形式与动力学约束的关系,提出了一种基于装配模型的虚拟样机建模方法。通过装配形式与动力学约束的一一映射,将各个约束模型搭建成整体虚拟样机模型。分析了基于装配的虚拟样机建模原理,研究了Pro/E中几种装配约束与动力学约束模块的对应关系,以及齿轮传动模型的建模方法。利用Simulink下面向机构分析的SimMechanics对一个自建的简单机构进行了概念验证。验证结果表明基于装配模型的虚拟样机建模的方法可行,此方法为研究装配对样机性能的影响奠定了技术基础。
关键词:装配;虚拟样机;概念验证;动力学仿真
中图分类号:TP391.9????? 文献标识码:A??? ???文章编号:1004-731X (2016) 09-1937-08
Fast Implementation of Virtual Prototyping Modeling Based on Assembly Model
Wang Yu, Yao Shouwen, Liu Jilin, Huang Dezhi, Zhang Qinghua, Yi Ran
(School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China)
Abstract: A new method of virtual prototyping modeling was proposed based on assembly model, concerning the relation between assembly forms and dynamic constrains. With the transformation of assembly forms and dynamic constrains, a virtual prototyping model was built by the use of constrain models. Analysis of principle of modeling virtual prototype based on assembly was carried out, and the corresponding relationship between the assembly constraints in Pro/E and constraint block was studied and the method of modeling gear transmission was researched. With the utility of SimMechanics, a model library facing mechanism analysis under Simulink, a concept verification of a simple self-built machine was executed. The result shows that the method of virtual prototyping modeling based on assembly model is feasible, and this method provides technological base for researching the prototype performance influenced by assembly.
Keywords: assembly; virtual prototype; concept verification; dynamic simulation
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
船用柔性绳索的仿真研究
梁民仓,尹勇
(大连海事大学航海动态仿真和控制交通部重点实验室,大连 116026)
摘要:针对仿真系统中船用柔性绳索模拟存在实时性差、逼真度不够及易发散等问题,提出了一种基于质点-弹簧模型的结构-弯曲弹簧模型,该模型通过添加弯曲弹簧以限制绳子质点处的不正常弯曲现象,并可通过设置两种弹簧不同的弹性、阻尼系数以模拟不同硬度的绳索。为了保证模型运行稳定性及精度,采用改进的Euler法进行数值解算,同时运用位置调整法、速度调整法解决柔性绳索仿真时的超弹性问题,并通过仿真实验对该模型进行了验证。
关键词:柔性绳索;质点-弹簧模型;结构-弯曲弹簧模型;超弹性问题
中图分类号:TP391.9??? ????文献标识码:A???????? 文章编号:1004-731X (2016) 09-1945-06
Research on Simulation of Flexible Rope for Ship
Liang Mincang, Yin Yong
(Key Lab. of Marine Simulation & Control, Dalian Maritime University, Dalian 116026, China)
Abstract: In view of the problems on unreal-time, less realistic and the instability of the marine flexible rope simulation system, one kind of structure-bending spring model was proposed based on the traditional mass-spring model. Bending springs were added in the model to limit the abnormal bending phenomenon in the particle of model by setting different elasticity and damping coefficient for two kinds of spring to simulate the ropes with different rigidity. In order to guarantee the stability and accuracy of the model, improved Euler method was adopted for numerical solution. At the same time, position adjustment method and speed adjustment method were used to solve the problem of super elasticity in the simulation of flexible rope, and verify the feasibility of the model by simulation experiments.
Keywords: flexible rope; mass-spring model; structure-bending spring mode; problem of super elasticity
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
虚实运动一致性对虚拟现实晕动症的影响
蔡力1,2,翁冬冬1,2,张振亮1,2,余兴尧1,2
(1. 北京理工大学光电学院,北京 100081;2. 北京市混合显示与新型显示工程技术研究中心,北京 100081)
摘要:晕动症是制约虚拟现实技术发展的重要因素之一,目前关于虚拟现实晕动症的研究大多基于静态或者运动仿真平台,极少在真实运动状态下进行研究。为了研究真实运动状态下的晕动症,设计了一套虚拟现实系统并对虚拟现实晕动症进行评测。系统使用头盔显示器和一辆可以实时采集运动状态的车辆,让参与者在实验过程中看到与真实运动状态一致的虚拟场景。通过主观和客观的对比实验对参与者在视觉和前庭感知冲突的条件下产生的晕动症程度进行了评价。实验结果表明,运动状态与视觉状态是否一致对虚拟现实晕动症有很大的影响,用户在使用系统时的晕动症程度会随着真实运动状态与视觉一致性的减小而提升,在极端条件下可产生用户无法承受的生理不适状况。
关键词:虚拟现实晕动症;真实运动状态;视觉前庭冲突;头盔显示
中图分类号:TP391.9????? 文献标识码:A??? ???文章编号:1004-731X (2016) 09-1950-07
Impact of Consistencyed7ag8879环亚手机|首页主页
Between Visually Perceived Movement and Real Movement on Cybersickness
Cai Li1,2, Weng Dongdong1,2, Zhang Zhenliang1,2, Yu Xingyao1,2
(1.School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China;ed7ag8879环亚手机|首页主页
2.Beijing Engineering Research Center for Mixed Reality and Advanced Display Technology, Beijing 100081, China)
Abstract: The cybersickness is still a huge obstacle for virtual reality (VR) system. Current researches on cybersickness are mostly based on static or dynamic simulators, while studies in the real movement state is rare. An evaluating system which employed a head-mounted display (HMD) with a running vehicle was proposed to study the cybersickness in the real movement state. In this system, users sitting in the vehicle could see virtual scenes which was consistent with the real motion through the HMD. Subjective and objective evaluating experiments were proposed to analyze the different levels of the cybersickness caused by visual-vestibular conflict. The results show that the consistency of real movement and visually perceived movement have a great impact on cybersickness. Cybersickness gets worse when the consistency decreases. Serious cybersickness may lead to extreme situation where the discomfort may not be afforded by users.
Keywords: cybersickness; real movement; visual-vestibular conflict; head-mounted display
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
基于CGAL的船舶浮态计算
王智洲,孙霄峰,尹勇,刘春雷
(大连海事大学 航海动态仿真和控制交通部重点实验室,大连 116026)
摘要:为提高船舶浮态计算精度,提出一种基于CGAL(Computational Geometry Algorithms Library)的船舶浮态计算方法。利用CGAL中的切片模块按肋位纵向切割船体型表面,得到每个肋位处横剖面型值数据;对横剖面型值数据进行简化和等距偏移,得到各肋位处的外板数据;通过水线面和外板数据求交计算得到雅克比矩阵系数;通过牛顿迭代法求解船舶浮态方程组计算出船舶浮态。以散货船“SHANDONG REN HE”为例,对10个典型载况进行了实例计算,与装载手册给定值相比,浮态计算结果误差较小。结果表明:相比于传统方法,本文所提出方法适用于船舶任意浮态,计算精度较高,实时性较好,具有一定的工程应用价值。
关键词:船舶工程;船舶浮态;牛顿迭代;几何算法库
中图分类号:U661.21????? 文献标识码:A??? ???文章编号:1004-731X (2016) 09-1957-08
Ship Floating Calculation Based on CGAL
Wang Zhizhou, Sun Xiaofeng, Yin Yong, Liu Chunlei
(Key Lab. of Marine Simulation & Control, Dalian Maritime University, Dalian 116026, China)
Abstract: To improve the computational accuracy of ship floating condition, a method of ship floating calculation was proposed based on CGAL (Computational Geometry Algorithms Library). By using the slicing module in CGAL, the offset table was obtained through longitudinally slicing 3D design surface; The shell data were gained by simplification and equidistant offsetting; The Jacobi matrix coefficients were achieved by intersecting water plane and shell data; Ship floating condition equations were solved by Newton iteration method. Taking Bulk carrier "SHANDONG REN HE" as an example, ship floating calculations under ten typical loading conditions were carried out. The computational error between calculated results and those given by the loading manual was relatively small. Compared with traditional methods, the method can be used to calculate arbitrary floating conditions in real-time with high precision and has a certain engineering application value.
Keywords: ship engineering; ship floatation; Newton iteration method; CGAL
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
动态人群情绪感染并行仿真算法
向南1,张明敏2,朱凌云1
(1. 重庆理工大学计算机学院,重庆 400054;2. 浙江大学计算机学院,杭州 310058)
摘要:由于动态人群的个体位置是动态变化的,因此情绪传染过程的计算成为一个难题。现有算法在人群仿真中通常需要计算每两物体之间的反应而无法达到实时要求。为了解决这个问题,提出一种基于GPU加速和社会力的感染力并行计算方法。将个人的情感影响范围投射到二维网格上,并用相同大小九宫格表示;并行计算个体与最近邻之间的相互作用力以便确定个体的运动位置;接着计算个体相互之间的情绪感染力向量并渲染仿真结果。整个算法通过GPU并行处理。实验显示,本算法有效提高较大规模动态人群情绪感染仿真的精确性与计算速度。
关键词:情感计算;情绪感染;社会力;GPU加速
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2016) 09-1964-06
Paralleled Dynamic Crowd Emotion Contagion Algorithm
Xiang Nan1, Zhang Mingmin2, Zhu Lingyun1
(1. School of Computer Science and Engineering, Chongqing University of Technology, Chongqing 400054, China;ed7ag8879环亚手机|首页主页
2. School of Computer Science and Technology, Zhejiang University, Hangzhou 310058, China)
Abstract: As the positions of crowd usually change dynamically, then computing the contagion process becomes a challenge. There current algorithms were too time consuming to be adopted as they needed to calculate the reactions between every two objects. In order to solve this problem, a social force based contagion computing algorithm with GPU acceleration was provided. Individuals’ affection fields were projected onto two dimensional mesh grid and represented by the nine-box diary; The social force reactions between individual and nearest neighbors were computed to get the moving position; The contagion results from nearest neighbors were calculated. All of these steps were paralleled processing by GPU. Experiments show that the algorithm can efficiently increase the accuracy and speed of emotion contagion.
Keywords: affective computing; emotion contagion; social force; GPU acceleration
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
变形统计地图构建方法综述
陈谊,赵云芳,杜晓敏
(北京工商大学计算机与信息工程学院食品安全大数据技术北京市重点实验室,北京 100048)
摘要:变形统计地图是一种可视化表达统计数据地理分布的有效方法,在很多领域都有应用。介绍了变形统计地图(Cartogram)的概念、分类和生成方法。归纳总结了连续型和非连续型、规则型和非规则型变形统计地图的构建算法,从统计失真、地理失真和算法效率三个方面,给出了变形统计地图构建算法的3个评价指标,即面积-属性匹配度、区域形状扭曲度和算法执行时间。根据这3个指标对各类构建算法进行了对比分析,并对未来变形统计地图的发展前景进行了展望。
关键词:变形统计地图;地图连续性;地理失真;统计失真;形状扭曲
中图分类号:TP391??? ?????文献标识码:A??? ??????文章编号:1004-731X (2016) 09-1970-09
Overview of Cartogram Algorithm
Chen Yi, Zhao Yunfang, Du Xiaomin
(Beijing Key Laboratory of Big Data Technology for Food Safety, School of Computer and Information Engineering,ed7ag8879环亚手机|首页主页
?Beijing Technology and Business University, Beijing 100048, China)
Abstract: Cartogram is a type of visualization method for effectively presenting the geographical information distribution of the statistical data, which has a wide range of usage in many fields. The concepts, classifications and generation methods of the Cartogram were described. Different generation algorithms of it were summarized, considering the continuity and regularity features. Besides, from the two aspects of both statistical and geographical distortions, three evaluation indexes were proposed: an index that evaluated whether the area sizes represented the true attribute values; and one which represented the degree of the regional shape distortions; and last but not the least, the algorithm execution time; after that the comparison of different Cartogram generation algorithms were generally given and the future of Cartogram was prospected.
Keywords: Cartogram; map continuity; geographical distortion; statistical distortion; shape distortion
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
实时修正的烟幕随机游走仿真模型
孙逊1,2,王玄玉2,王献1,刘顺华1
(1.防化学院研究生管理大队,北京 102205;2.防化学院防化装备系,北京 102205)
摘要:烟幕的高斯扩散模式不适合复杂大气条件,随机游走模式不易精确求得微粒的统计性质,这两种模式实用性均受到限制。针对上面所说的问题,提出了利用数学形态学算法实时检测视频中烟幕边缘数据,根据此数据实时修正的随机游走烟幕仿真模型的方法。试验结果表明,修正后的模型适合实际的复杂大气条件下烟幕建模仿真,所生成的仿真烟幕精度可控,比较接近真实的烟幕,实现了烟幕的精确化仿真。解决了随机游走和高斯烟幕仿真模型不太实用的问题。
关键词:烟幕;数学形态学;边缘检测;随机游走;仿真
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2016) 09-1979-06
Random-walk Smokescreen Simulation Model of Real-time Correction
Sun Xun1,2, Wang Xuanyu2, Wang Xian1, Liu Shunhua1
(1. Department of graduate management of Institute of NBC Defence, Beijing 102205, China;ed7ag8879环亚手机|首页主页
2. Department of chemical defence equipment of Institute of NBC Defence, Beijing 102205, China)
Abstract: Gaussian diffusion mode of smokescreen is not suitable for complex atmospheric conditions and it is not easy to accurately obtain statistical properties of particles by utilizing random-walk mode, so the practicability of these two kinds of modes is limited. In view of the problems mentioned above, the revised random-walk smokescreen simulation model method was put forward, in the method, mathematical morphology algorithm was utilized to detect the data on smokescreen edge in a video in real-time and the model was rectified in real-time on basis of such data. The test result indicates that the revised model is suitable for actual smokescreen modeling and simulation under complex atmospheric conditions. The precision of the generated simulation smokescreen is controllable and the model is approximate to the real smokescreen. The method realizes precise simulation of smokescreen and solves the problems that the random-walk model and gauss smokescreen simulation model are not practical.
Keywords: smokescreen; mathematical morphology; edge detection; random-walk mode; simulation
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
基于种子区域增长的快速图像融合
赵毅力1,2,徐丹1,钱文华1,张雁2
(1. 云南大学信息学院,昆明 650091;2. 西南林业大学计算机与信息学院,昆明 650224)
摘要:提出一种对一组配准图像进行快速无缝融合的方法。该方法使用基于优先级队列的种子区域增长算法来快速计算重叠图像之间的最优拼接线。使用种子区域增长算法在图像重叠区域搜索可能的拼接线,使得图像的融合时间显着减少。采用种子区域增长来求解图像重叠区域的拼接线能够保证图像之间的每个重叠区域都能计算得到近似最优解,这些重叠区域的独立性使得该算法适合于并行实现。对提出的方法和基于图割以及基于分水岭变换的图像融合方法进行了比较和评估
关键词:图像拼接;分水岭变换;图割;种子区域增长;图像融合
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2016) 09-1985-05
Fast Image Blending Using Seeded Region Growing
ZhaoYili1,2, Xu Dan1, Qian Wenhua1, Zhang Yan2
(1. School of Information, Yunnan University, Kunming 650091, China; ed7ag8879环亚手机|首页主页
2. School of Computer and Information, Southwest Forestry University, Kunming 650224, China)
Abstract: This paper presented a novel approach for combining and blending a set of aligned images into a composite mosaic with no visible seams. The compositing seam is found efficiently via seeded region growing using a photometric criterion. A contribution of this paper is to use seeded region growing on image differences to find possible seams over areas of low photometric difference. This can result in significant reduction of blending time. The using of seeded region growing over image pairs guaranteed the approximate optimal solution for each intersection region. The independence of such regions makes the algorithm suitable for parallel implementation. The proposed method is evaluated with pixel based graph cut and watershed based graph cut with qualitative and quantitative comparison.
Keywords: image mosaic; watershed transform; graph cut; seeded region growing; image blending
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
强激光武器协同防空作战仿真系统设计
王鑫1,徐磊2,苏智勇1
(1. 南京理工大学自动化学院,江苏 南京 210094;2. 上海机电工程研究所,上海 201109)
摘要:为满足未来防空作战的需求,改善传统防空武器系统性能以及火力配置的空缺,将新型激光武器与传统防空武器相结合,基于高层体系结构HLA(High Level Architecture),以编队的形式展开协同防空作战系统的设计和开发,实现对系统作战方案、流程的仿真。整个作战仿真系统分为三部分:仿真支撑平台、装备仿真模块和三维仿真模块。通过划分联邦成员,建立概念模型,确定对象类和交互类,完成联邦集成,实现各个分系统的构建。实现各武器系统以及相关工作过程的三维建模和仿真。利用实时分布式仿真平台DTS(Distributed Time-Triggered Simulation)以及OSG (OpenScene Graph)完成协同防空作战仿真系统的开发与测试,展示了仿真系统的运行过程。
关键词:新型激光武器;协同防空;高层体系结构;DTS;OSG
中图分类号:TP391.9????? 文献标识码:A??? ???文章编号:1004-731X (2016) 09-1990-06
Design of Simulation System about Laser Weapon Cooperative Engagement
Wang Xin1, Xu Lei2, Su Zhiyong1
(1. School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China; ed7ag8879环亚手机|首页主页
2. Shanghai Institute of Electro-Mechanical Engineering, Shanghai 201109, China)
Abstract: To satisfy the need of air defense combat in the future, the concept of cooperative combat of new laser weapons and traditional anti-aircraft weapons was proposed. The simulation system based on HLA aimed to improve the performance of the system of traditional anti-aircraft weapons. The whole system was mainly divided into three parts: simulation platform, equipment simulation and three-dimensional simulation. Firstly, the object class and interaction class were designed according to federal members and federal integration. Then the important part was the three-dimensional modeling and simulation work of every weapon system. Finally, the air defense simulation system was realized on distributed simulation development platform DTS and OSG. The system was tested, and the process of system operation was showed.
Keywords:new laser weapon; cooperative air defense; high level architecture; DTS; OSG
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
无人机协同路径规划三维实时可视化仿真平台
陈龚1,徐磊2,苏智勇1
(1. 南京理工大学自动化学院,南京 210094;2. 上海机电工程研究所,上海 201109)
摘要:针对当前无人机路径规划研究在规划结果仿真验证和三维可视化方面的不足,研究和实现了一种无人机协同路径规划三维实时可视化仿真平台。对目标区域进行网格划分和面积计算;用虚拟相机对无人机载荷侦照波束建模,基于图形硬件实现侦照波束与三维地形的快速求交;利用多边形填充算法计算被侦照地形范围,记录和统计侦照信息并生成相应的色温图。通过仿真平台的实际运行,证明该仿真平台为传统协同路径规划提供了一种实用的三维可视化仿真验证手段
关键词:无人机;路径规划;侦察;实时求交;仿真平台
中图分类号:TP391.9????? 文献标识码:A??? ???文章编号:1004-731X (2016) 09-1996-06
3D Real-time Visualization and Simulation Platform for Collaborative Path Planning of UA
Chen Gong1, Xu Lei2, Su Zhiyong1
(1. School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China; ed7ag8879环亚手机|首页主页
2. Shanghai Institute of Electro-Mechanical Engineering, Shanghai 201109, China)
Abstract: There are still some issues existing in current path planning of UAV, such as planning result simulation verification and 3D visualization. To solve the problems, a 3D real-time visualization and simulation platform for collaborative path planning of UAV was proposed. The target area was divided and calculated. The reconnaissance beam of UAV was modeled with virtual camera, the intersection points obtained quickly based on graphics hardware. The terrain mesh was calculated by scan-line polygon filling algorithm, reconnaissance information was recorded and analyzed, and the color temperature maps were given. Through the actual operation by the simulation platform, simulation results verify that the simulation platform provides a practical means of visualization simulation and verification for traditional collaborative path planning.
Keywords: UAV; path planning; reconnaissance; real-time intersection; simulation platform
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
针对大规模复杂几何表面的三维数据探查技术
艾志玮,曹轶,肖丽,王华维
(北京应用物理与计算数学研究所,北京 100094)
摘要:针对大规模复杂几何表面的物理场三维可视探查,在三维电磁仿真模拟应用中具有重要应用价值。提出一种适用于大规模并行处理的三维数据探查技术:它通过引入探测体和被探测数据集的双数据源概念和基于合约的数据预筛选策略,在可视化底层实现了针对大规模三维数据探查的高效支撑;针对任意复杂几何表面的精确三维探查,则是基于空间包围盒的探测体切割算法和基于探测体几何表面的数据探测算法。研究成果已被成功应用于机身蒙皮电场的特征分布分析和导引头高价值目标电磁损伤精确评估等复杂电磁环境重大实际应用之中。
关键词:数据探查;并行处理;可视化;几何构型
中图分类号:TP391????? 文献标识码:A??? ???文章编号:1004-731X (2016) 09-2002-07
Three-dimensional Data Exploration Technologyed7ag8879环亚手机|首页主页
Based on Large-scale Complex Geometrical Surfaces
Ai Zhiwei, Cao Yi, Xiao Li, Wang Huawei
(High Performance Computing Center, Institute of Applied Physics and Computational Mathematics, Beijing 100094, China)
Abstract: Three-dimensional physical field data exploration visualization based on large scale complex geometric surface is of great value in three-dimensional electromagnetic simulation applications. Research was proposed which was suitable for massively parallel processing technology of three-dimensional data exploration. The concept of dual-data-source and data filtering policies was introduced based on contracts. Clipping algorithms based on spatial bounding box and data probing algorithm can support accurate three-dimensional data profiling for complex surface geometry. Research results have been applied to significant practical applications, such as the fuselage characteristics of electric field distribution analysis and high value targets within the seeker's accurate assessment of electromagnetic injury complicated electromagnetic environment, and get better results.
Keywords: data exploration; parallel processing; visualization; geometry
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
锚操作仿真系统的研究
朱忠显,尹勇,神和龙
(大连海事大学航海动态仿真和控制实验室,大连 116026)
摘要:锚操作模拟器能够为科研人员和受训的锚操作人员提供一个良好的可视化平台,对改善工作环境和提高工作效率有非常重要的意义。为搭建锚操作场景仿真系统,基于集中质量法建立了锚泊系统的动力学模型,并在航海模拟器的基础上加入海洋平台和锚作船的运动数学模型;利用OSGOpenSceneGraph场景管理引擎,并采用一系列可视化方法与技术实现锚操作过程的仿真,形成一套基于物理的锚操作场景仿真软件。仿真系统包括数学模型解算模块、场景仿真模块和用户交互模块。系统的测试结果表明仿真效果、实时性和稳定性均能够满足锚操作模拟器的要求。
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2016) 09-2009-08
Research on Anchor Handling Simulation System
Zhu Zhongxian, Yin Yong, Shen Helong
(Laboratory of Marine Simulation & Control, Dalian Maritime University, Dalian 116026, China)
Abstract: Anchor handling simulator (AHS) can provide a good visualization platform for the researchers and the anchor handling trainees, and has important significance on improving the working environment and efficiency. To build the anchor handling simulation platform, the mooring system's dynamics model was established based on Lumped Mass Method(LMM), and the offshore platform and anchor handling vessel's mathematical models were introduced based on the existing technologies?in marine simulator. By utilizing the OpenSceneGraph(OSG) scene management engine and applying a series of visualization technologies, realized the simulation of the anchor handling operations, a real-time physical-based anchor handling scene simulation software was generated. The simulation system includes model solving module, scene simulation module and user interface?module. The system's testing results show that the simulation effect, real-time and stability all can fulfill the AHS's demand.
Keywords: anchor handling simulator; mooring system; dynamics model; lumped mass method
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
基于移动平台的空间环境仿真技术研究
胡校飞,周杨,李鹏飞,许继伟,薛现光
(信息工程大学地理空间信息学院,郑州 450001)
摘要:在研究空间环境可视化仿真技术的基础上,结合移动平台的特点,进一步研究了针对移动平台的空间环境对象可视化仿真技术。重点研究了三维星空背景数据存储组织、调度、绘制技术,航天器轨道计算与可视化仿真技术以及三维数字地球海量地理信息数据存储组织、场景动态更新渲染技术。提出了基于屏幕范围的瓦片细分算法,该算法以瓦片在屏幕上的投影范围大小作为细分瓦片的判断条件,测试结果表明瓦片细分结果正确。针对移动设备性能相对较低,存储能力较弱的不足,设计了CS架构模式的基于移动平台的空间环境仿真系统。测试结果表明,该系统可在Android操作系统移动设备上流畅运行,用户体验良好,可视化效果令人满意。
关键词:空间环境;三维地球;仿真技术;移动三维
中图分类号:P236?? ???文献标识码:A??? ??文章编号:1004-731X (2016) 09-2017-06
Research on Space Environment Simulation Technology Based on Mobile Platform
Hu Xiaofei, Zhou Yang, Li Pengfei, Xu Jiwei, Xue Xianguang
(Institute of Surveying and Mapping, Information Engineering University, Zhengzhou 450001, China)
Abstract: Based on the study of the spatial visualized simulation, a novel visualized simulation technology of spatial objects built on mobile platform was developed. Critical technologies include the organization, scheduling and mapping with the background of 3D starry sky, calculation and visualized simulation of spacecraft orbit, and storage, organization, dynamic scenario-based updated rendering of 3D digital earth mega geographic data. A fractionized tile algorithm covering the scope of screen was proposed. Projection ranged on the screen was taken as the criteria of fractionation of tiles in the algorithm. Testing results show that the fractionation is correct. Spatial simulation system with C/S architecture on the mobile platform was designed due to the relatively low efficiency and poor ability to store of mobile equipment. Testing results show that the system can run smoothly on the Android operating system with favorable user experience. The visualization effect is satisfactory.
Key words: spatial environment; 3D earth; simulation technology; mobile 3D rendering
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
内河船舶模拟器中大尺度河流实时绘制
翟小明,尹勇,神和龙
(大连海事大学航海动态仿真与控制实验室,大连 116026)
摘要:为提升现有内河船舶模拟器中河流仿真的真实感,提出一种适用于内河船舶模拟器中大尺度河流绘制方法。该方法通过引入流函数构建河流速度场,并利用泊松盘分布算法控制河流速度场空间分布,可有效地平衡效率与河流表面绘制效果;利用GPU的并行性和可编程性完成河流可视化。实验结果证明:构建的河流流体速度场能够很好地体现河流流动特性,并且泊松盘分布算法能良好地控制河流表面。基于GPU能够实现大尺度河流实时绘制,并提升内河船舶模拟器中河流视景的环境真实感。
关键词:船舶模拟器;河流;大尺度;实时绘制;GPU
中图分类号:TP391.9????? 文献标识码:A??? ???文章编号:1004-731X (2016) 09-2023-06
Real-time Rendering of Large-scale River in Inland River Ship Simulator
Zhai Xiaoming, Yin Yong, Shen Helong
(Marine Dynamic Simulation and Control Lab, Dalian Maritime University, Dalian 116026, China)
Abstract: To improve the reality of river visual in inland river ship simulator, a method of rendering large scale river which could be applied for inland river ship simulator was proposed. The river flowing field was built though the conception of stream function, and the algorithm of Poisson disk sampling was used to control the distribution of river flowing field. This could balance the relationship between efficiency and effect of river surface. The parallelism and programmability of GPU was adopt to render river surface. The results show the river flowing field generated by algorithm of stream function can reflect the mobility of river, and the algorithm of Poisson disk sampling can control river surface efficiently. GPU is used for rendering of river that can realize real time rendering of large scale river, and improve the reality of environment of inland river ship simulator.
Keywords: ship simulator; river; large-scale; real-time; GPU
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
船舶动力定位控制算法测试仿真系统
钱小斌,尹勇,神和龙,孙霄峰,张秀凤
(大连海事大学 航海动态仿真和控制实验室,大连 116026)
摘要:为克服动力定位控制算法的实船测试具有风险大、调试周期长、费用高的缺点,设计了船舶动力定位控制算法测试仿真平台建立了动力定位船舶的运动数学模型和风浪流等海洋环境对船舶的扰动模型分析了动力定位船舶的运动特点提出仿真平台的设计要求介绍了仿真系统的功能框架和实现测试流程以及相关的接口以一艘动力定位供给船为研究对象,采用模型预测控制算法进行自动定位模式的测试,测试结果表明:该仿真系统能够验证动力定位控制算法的有效性和鲁棒性,减少实船试验带来的风险和时间,对动力定位控制算法的研究具有重要意义。
关键词:动力定位系统;测试;仿真;控制算法
中图分类号:TP391.9????? 文献标识码:A??? ???文章编号:1004-731X (2016) 09-2028-07
Simulation System for Testing Ship Dynamic Positioning Control Algorithm
Qian Xiaobin, Yin Yong, Shen Helong, Sun Xiaofeng, Zhang Xiufeng
(Marine Dynamic Simulation and Control Lab., Dalian Maritime University, Dalian 116026, China)
Abstract: To overcome the disadvantage of ship dynamic positioning control algorithm tests on sea trials, which features high risk, long debugging period and high expense, a simulation system for testing ship dynamic positioning control algorithm was designed. Motion mathematical model of dynamic positioning vessel and ocean disturbance model were established. The function requirements were proposed based on the characteristic of DP vessel movement. Architecture and implementation of the simulation system were introduced. Testing process and the related interface was descripted. A simulation was conducted on a DP supply vessel, which shows that: the simulation system can verify the effectiveness and robustness of ship dynamic positioning control algorithm, and risk and time of test on sea are reduced, which is significant to the study of dynamic positioning control algorithm.
Keywords: dynamic positioning system; test; simulation; control algorithm
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
一种面向层次数据可视化的圆形空间填充算法
,李志龙,冯玉超,陈谊
(北京工商大学食品安全大数据技术北京市重点实验室计算机与信息工程学院,北京 100048)
摘要:现有的嵌套圆排列方法主要采用自顶向下的排列方式。排列过程中的多次缩放和平移将导致算法时间复杂度增高、各层节点大小比例不一致以及局部排列不够紧密等问题。为解决上述问题,在总结层次结构中同层兄弟节点圆外切排列算法的基础上,提出了自底向上父子节点的递归排列算法——圆形-矩形中心法CRCA(Circle and Rectangle Center Algorithm),并提出了一种评价父子节点排列紧密性的指标——面积比AR(Area Ratio)。将基于CRCA算法的嵌套圆排列方法应用于各国农药最大残留限量标准数据的可视化中。实验表明,该方法能够保持同层节点的大小比例和更紧密的排列效果,提高空间利用率,在数据展示方面取得良好效果。
关键词:信息可视化;层次结构;嵌套圆;评价指标
中图分类号:TP391????? 文献标识码:A?????? 文章编号:1004-731X (2016) 09-2035-07
Circular Space-filling Algorithm for Hierarchical Data Visualization
Hou Kun, Li Zhilong, Feng Yuchao, Chen Yi
(Beijing Key Laboratory of Big Data Technology for Food Safety, School of Computer and Information Engineering,ed7ag8879环亚手机|首页主页
?Beijing Technology and Business University, Beijing 100048, China)
Abstract: The existed Circle Packing methods mainly take the style of top-down to arrange all the nodes. When the nodes of different layer was arranged, the scaling and translation would cause relative high time complexity of the algorithm, and the size proportional discordance of nodes of different father nodes but the same layer, and it also causes the problems like defective tightness between the layouts of father nodes and child nodes. To solve problems above, on the basis of summarizing methods of arranging brother nodes of the same layer, the algorithm——CRCA(Circle and Rectangle Center Algorithm) was proposed, which took the style of down-top. And an indicator evaluating the layout tightness between father nodes and child nodes was presented, which was called AR(Area Ratio). The Circle Packing method based on CRCA would be applied to the visual analysis on the data of Maximum Residue Limits (MRLs) of pesticides in China (GB2763-2014). After visualizing the MRLs data, it is proved efficient to help users to compare the data and also significant to get a better knowledge of the MRLs data.
Keywords: information visualization; hierarchical structure; circle packing; evaluation indicator
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
航天器天线的建模与仿真
周倜,苗毅,孙军
(北京航天飞行控制中心, 北京 100094)
摘要:为解决航天仿真系统中航天器与中继星的平台可见性问题,在基于HLA的仿真软件体系结构基础上,研究了几种二维空间中航天器天线的仿真模型,给出了在相应模型下中继星的可见性充要条件及计算方法。研究了三维空间的天线模型,结合航天器轨道和姿态信息,给出了带航天器姿态信息的三维天线模型,并采用矩阵变换等方式将所需的矢量转换到同一坐标系中,利用充要条件判断可见性。在实验中,采用C程序实现了文中提出的几种天线模型。结果表明带航天器姿态信息的三维空间天线模型可灵活有效地判断载人航天仿真中航天器与中继星的可见性。
关键词:天线模型;仿真;可见性;姿态信息
中图分类号:TP391????? 文献标识码:A?????? 文章编号:1004-731X (2016) 09-2042-07
Antenna Model in Simulation of Spacecraft
Zhou Ti, Miao Yi, Sun Jun
(Beijing Aerospace Control Center, Beijing 100094, China)
Abstract: To give a solution how to catch relay satellite by spacecraft in the simulation system of manned craft, several 2D craft models were studied in the simulation software based on HLA, and some sufficient and necessary conditions?and the methods were given to compute the visibility of relay satellite according to these models. On these methods, 3D antenna model and the orbit and attitude model of spacecraft were researched, and 3D antenna model was given with attitude information of craft. Finally, matrix translations were used to translate some vectors to the same reference frame, and the visibility was decided by these sufficient and necessary conditions. These models were implemented by C program in the experiment. The result shows that the antenna model with the attitude information of craft in 3D is flexible and effective to compute the visibility between craft and relay satellite in the simulation of manned craft mission.
Keywords: antenna model; simulation; visibility; attitude information
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
飞行器大数据量CAD模型并行绘制
谈敦铭1,曹国廷1,郎娟芳1,杨朔2
(1. 空军第一航空学院, 河南 信阳 464000;2. 中国人民解放军95903部队,湖北 武汉 430331)
摘要:针对飞行器CAD模型的数据量非常大,难以实现高分辨率实时绘制的问题,提出了一种基于拼接屏的多CPU并行绘制方法。集群绘制节点之间通过基于Sort-first的拼接屏并行绘制,将CAD模型构建动态BVH树,快速剔除单个节点视锥体外不可见的部分以降低负载,绘制结果通过拼接屏输出显示。集群绘制节点内部利用多核处理器开展数据调度、可见性剔除、BVH树更新、绘制等多线程并行进一步提高性能。实验结果表明,利用15个绘制节点并行绘制包含1 700万三角面片的飞行器大数据量CAD模型,可实时绘制分辨率高达6800*2304像素的图像。
关键词:大数据量CAD模型;并行绘制;机群;多线程
中图分类号:TP391.7????? 文献标识码:A?????? 文章编号:1004-731X (2016) 09-2049-06
Parallel Rendering of Massive Aircraft CAD models
Tan Dunming1, Cao Guoting1, Lang Juanfang1, Yang Shuo2
(1. The First Aeronautical Institute of PLA Air Force, Xinyang, 464000, China; 2. No. 95903 Unit of PLA, Wuhan, 430331, China)
Abstract:A parallel rendering method was presented with PC clusters in order to render massive aircraft CAD models in real time with high resolution. PC clusters were used for sort-first based rendering, BVH tree was built for efficient frustum culling, DID screens were utilized for high resolution display. In addition, multi-CPUs were exploited for thread based parallel out-of-core paging, frustum culling, BVH tree building and rendering. The experimental results show that by this parallel rendering PC clusters consists of 15 PC nodes, aircraft CAD models with 1.7 million of triangles can be rendered in real-time with resolution of 6800* 2304 pixels.
Keywords: massive CAD models; parallel rendering; cluster; multi-threads
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
基于格子Boltzmann的参数化流体仿真
郭中小1,刘慧文1,2,刘雪梅2,高阳3
(1. 中国水利水电科学研究院水利部牧区水利科学研究所,呼和浩特 010020;2. 华北水利水电大学,郑州 450011;ed7ag8879环亚手机|首页主页
3. 北京航空航天大学虚拟现实技术与系统国家重点实验室,北京 100191)
摘要:格子Boltzmann(LBM)方法已成为处理介于宏观与微观之间介观流体问题的有效数值方法对LBM方法的数值计算结果进行可视化,实时绘制成流体动画,以便从形象直观的角度进一步进行数据分析。针对二维LBM可视化方法,基于LBGK方程和D2Q9模型设计算法模型,提出了一种通过指标标准化,将浮点型流体速度值进行归一化处理,转化为RGBA颜色模式的强度值的速度场绘制方法。针对三维可视化方法,引入粒子水平集方法(Particle Level Set Method,PLSM)LBM 流体的液面进行追踪,并设计了LBMPLSM间的耦合算法。结果表明,所提出的流体可视化仿真方法正确有效,流体动画效果清晰、准确。
关键词:LBM方法;流体仿真;流体可视化;PLSM
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2016) 09-2054-08
Lattice Boltzmann Fluid Simulation Based on Parameters
Guo Zhongxiao1, Liu Huiwen1,2, Liu Xuemei2, Gao Yang3
(1. Institute of Water Resources for Pastoral Areas, Ministry of Water Resources, China Institute of Water Resources and Hydropower Research,?Hohhot 010020, China; 2. North China University of Water Resource and Electric Power, Zhengzhou 450011, China; ed7ag8879环亚手机|首页主页
3. State Key Laboratory of Virtual Reality Technology and Systems, Beihang University, Beijing 100191, China)
Abstract: In computational fluid dynamics (CFD), the lattice Boltzmann Method (LBM) has become the mainstream method of fluid numerical simulation based on Navier-Stokes equations. The visualization of numerical results and the real-time rendering of fluid animation could provide a visual method for data analysis. A velocity field drawn method for two-dimensional visualization was proposed based on LBGK equation and D2Q9 model design algorithm model, transforming floating-point fluid velocity value into the intensity values, which was used by the RGBA color rendering method. For three-dimensional visualization, Particle Level Set Method (PLSM) was used to track the fluid surface and coupled it with LBM algorithm. Through the simulation instances, the results show the method is simple, real-time, and the fluid animation is vivid and accurate.
Keywords: LBM method; fluid visualization; parameters; fluid data normalized
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
基于分布式组件服务的配电网在线仿真技术
叶学顺,盛万兴,孟晓丽,刘科研,刁赢龙
(中国电力科学研究院,北京 100192)
摘要:研究了基于分布式组件服务的智能配电网在线仿真技术架构,提出了面向服务的基础计算框架、各模块协调机制,以及分布式部署模式提出了仿真系统与在线数据源的交互接口、传输方式及整合方法建立了含光伏、风电等新型设备的配电网数字仿真模型,设计了在线潮流、故障、可靠性、无功优化、分布式电源选址定容等功能模块。最后,采用以上架构和方法,实现了智能配电网在线仿真系统,并通过某地区10 kV配电网算例进行了仿真,验证了仿真方法的可行性。
关键词:面向服务;组件;配电网;在线;仿真
中图分类号:TP391.9????? 文献标识码:A??? ???文章编号:1004-731X (2016) 09-2062-07
Research on Online Simulation Technology of Intelligent Distribution Network
Based on Distributed Component Service
Ye Xueshun, Sheng Wanxing, Meng Xiaoli, Liu Keyan, Diao Yinglong
(China Electric Power Research Institute, Haidian District, Beijing 100192, China)
Abstract: Simulation architecture of intelligent distribution network was investigated based on component service, Service Oriented Architecture computing framework, modules coordination mechanism and component deployment and realization method were proposed. And data interactive interface, transmission and integration method with online data resources were proposed. Meanwhile, distribution network simulation model, including photovoltaic, wind power and other distributed generation was established, which designed online power flow, fault calculation, reliability, reactive power optimization, distributed generation locating and sizing function module. An online simulation system of intelligent distribution network was realized on basis of the architecture and method above. Through a 10 kV distribution network example, feasibility of the simulation method proposed was verified.
Keywords: Service Oriented Architecture (SOA); component; distribution network; online; simulation
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
基于Unity3D的绞吸式挖泥船虚拟仿真系统
姚鹏飞1,陈正鸣1,2,童晶1,2,钱丽娜3
1.河海大学物联网工程学院,江苏常州 2130222.常州市图形图像与骨科植入物数字化技术重点实验室,江苏常州 213022ed7ag8879环亚手机|首页主页
3
.河海大学疏浚教育部工程研究中心,江苏常州 213022
摘要:为了解决绞吸式挖泥船传统培训方法的一些不足,针对绞吸式挖泥船的施工操作流程和施工环境展示,设计了基于Unity3D的绞吸式挖泥船虚拟仿真系统。针对铰刀切削地形变化的仿真,采取了自动网格变形、贴图变化的方法;配合石块碎裂和管道内泥砂比重的粒子数量模拟,再通过寻路算法实现了2D平面的泥砂路径模拟;通过虚拟交互设备实现立体显示和人机交互,实现更好地虚拟仿真效果。
关键词:绞吸式挖泥船;Unity3D;绞刀切削;路径模拟;虚拟现实设备
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2016) 09-2069-07
Virtual Simulation System of Cutter Suction Dredger Based on Unity3D
Yao Pengfei1, Chen Zhengming1,2, Tong Jing1,2, Qian Lina3
(1. College of IOT Engineering, Hohai University, Changzhou 213022, China; ed7ag8879环亚手机|首页主页
2. Key Laboratory of Graphics, Images and Orthopedic Implants, Changzhou 213022, China;ed7ag8879环亚手机|首页主页
3. Engineering Research Center of the Education Ministry of Dredging Technology, Hohai University, Changzhou 213022, China)
Abstract: In order to solve some shortages for the traditional training of cutter suction dredger, a virtual simulation system was designed using Unity3D, which mainly targeted at operational procedures of construction and display of construction environment. Mesh deformation and texture changing were used to realize the simulation of the soil-cutting. The 2D path simulation which included the simulation of stone crushing and proportion of sand in the pipeline was realized by means of path-finding algorithm. 3D display and human-computer interaction were realized by virtual reality devices, which could improve the effect of the virtual simulation.
Keywords: cutter suction dredger; Unity3D; soil-cutting; path simulation; virtual reality devices
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
三维图形绘制生成航海雷达回波的强度仿真
曹士连1,2,金一丞1,尹勇1
(1. 大连海事大学航海动态仿真和控制实验室,大连 116026;2. 集美大学航海学院,厦门 361021)
摘要:现有航海雷达模拟器的回波图像对物标间的遮挡判断不明确,回波强度不能有效反映电磁波传播的物理特性。在分析射线跟踪方法的基础上,提出了以三维视景库为数据源,通过视景图形绘制方法生成航海雷达图像提出了基于雷达方程的航海雷达回波强度计算模型,以ITU建议标准为参考计算模型中的大气传播损耗、降雨损耗和云雾损耗,结合图形绘制流水线实现回波强度计算。仿真试验证明该方法生成的航海雷达图像物标遮挡关系明确,回波强度变化合理,真实感明显提高。
关键词:雷达图像;回波强度;图形绘制;GLSL
中图分类号:TP319.9???? ???文献标识码:A??? ???文章编号:1004-731X (2016) 09-2076-09
On Simulating Marine Radar Echo Intensity Generated by 3D Graphic Rendering
Cao Shilian1,2, Jin Yicheng1, Yin Yong1
(1. Laboratory of Marine Simulation & Control, Dalian Maritime University, Dalian 116026, China; ed7ag8879环亚手机|首页主页
2. Navigation collage, Jimei University, Xiamen 361021, China)
Abstract: The echo image cannot show reliable occlusion between objects, and the echo intensity cannot represent physical characteristics of electromagnetic wave propagation in the existing marine radar simulator. To solve these problems, a new method of generating radar echo image was raised on the basis analyzing the method of ray tracing. 3D visual database was used as data source, the marine radar echo image was generated by the method scene graphic rendering. A model based on radar equation was raised to compute marine radar echo intensity. The model gave the method of computing path attenuation, rain attenuation and attenuation due to cloud and fog based on ITU recommended standard. The generated echo image raised method was realized in programmable graphic pipeline. Simulation results show that the echo image object occlusion relation is clear, the echo intensity change is reasonable, and the echo reality is obviously improved.
Keywords: radar image; echo intensity; visual scene rendering; GLSL
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
游艇模拟器中游艇运动模型研究
孙霄峰,尹勇,周宏宇,张秀凤
(大连海事大学 航海动态仿真和控制交通部重点实验室,大连 116026)
摘要:游艇的运动数学模型是开发游艇模拟器的核心技术之一。根据分离建模思想,建立了游艇的平面运动数学模型。利用平面运动装置通过船模试验测得模型艇的水动力系数,分别计算作用于船体、螺旋桨和舵上的水动力和力矩,利用四阶龙格库塔法对船舶运动方程进行求解得到船舶运动参数利用Visual Studio 2010编写了游艇运动的仿真程序,并以三艘游艇为例,进行了游艇的操纵运动仿真。将仿真数据与船模试验数据进行了比对,结果表明所建立的游艇模型能够满足游艇模拟器的精度要求。
关键词:游艇;船舶运动数学模型;游艇模拟器; 航海仿真;
中图分类号:U675.91????? 文献标识码:A??? ???文章编号:1004-731X (2016) 09-2085-05
Research on mathematical model of yacht in yacht simulator
Sun Xiaofeng, Yin Yong, Zhou Hongyu, Zhang Xiufeng
(Key Lab. of Marine Simulation & Control, Dalian Maritime University, Dalian 116026, China)
Abstract: Mathematical model of yacht is one of the key technologies for the development of yacht simulator. According to the separate model of MMG (Maneuvering Model Group), a planar motion model of yacht was establishe d. The hydrodynamic coefficients were obtained through ship model test by using PMM (Planar Motion Device). Hydrodynamic forces and moments acting on the hull and propeller and rudder were calculated respectively. Ship motion equations were solved by means of the fourth order Runge-Kutt a method, and ship motion parameters were achieved. Simulated program was coded through Visual Studio 2013, and simulations of three yachts were done. Comparisons between simulated data and ship model test data show that the established model of yacht can meet the requirement of yacht simulator.
Keywords: yacht; mathematical model of ship motion; yacht simulator; Marine Simulation;
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
海洋工程船克令吊装卸仿真系统的运动模型
神和龙,尹勇,王秀杰
(大连海事大学航海动态仿真和控制交通行业重点实验室,大连116026)
摘要:海洋资源的开发对海洋工程设备有着高度的依赖性,其中海洋工程船应用领域广泛,船舶上常用的设备克令吊对货物的移动起到至关重要的作用。选取海洋工程船上最为常见的挺杆式克令吊为研究对象,根据其运动规律,利用拉格朗日方程建立克令吊系统的运动模型,并采用四阶龙格库塔方法对模型进行求解,分析了克令吊在不同作业形式下的动力学特性,并对模型进行了验证。
关键词:克令吊装卸仿真系统;挺杆式克令吊运动模型;拉格朗日运动方程;动力学特性
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2016) 09-2090-06
Modelling of Boom Crane Loading System of Marine Engineering Ship
Shen Helong, Yin Yong, Wang Xiujie
(Key Lab. of Marine Simulation and Control, Dalian Maritime University, Dalian 116026, China)
Abstract: Development of ocean resources has a high degree dependence on marine engineering equipment. Among them, marine engineering ship has been widely used in many areas. Cranes on ship play an important role on transferring cargoes. The boom crane which is the most common crane on marine engineering ship was chosen as researching object. According to its real motion law, the crane system’s motion model was built with Lagrange equation which was solved with Fourth-order Runge-Kutta. The dynamics characteristics of the crane in different forms of work were analyzed.
Keywords: boom crane loading simulator system;boom crane motion model;lagrange equation;dynamics characteristic
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
IGBT散热器设计与仿真
董伟杰,孟晓丽,宋晓辉,李伟
(中国电力科学研究院,北京 100192
摘要:目前变流器装置中功率器件IGBT为最主要的热源,其对装置的安全运行产生一定的影响,其散热结构的设计很重要。以某一款IGBT为例,详细对其功耗进行了分析计算,对散热器设计方法进行了研究,用绘图软件SolidWorks对所设计的散热器进行立体建模,将其导入有限元分析软件Ansys,结合IGBT实际运行环境对所设计的散热器进行热仿真,对不同构型散热器的散热效果进行了对比,为IGBT散热器的设计提供了理论依据。在硬件平台进行实物验证,证实了仿真的有效性。
关键词:IGBT功耗;散热器;热仿真;Ansys
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2016) 09-2095-06
IGBT Radiator Design and Simulation
Dong Weijie, Meng Xiaoli, Song Xiaohui, Li Wei
(China Electric Power Research Institute, Beijing 100192, China)
Abstract: The power component IGBT is the main heat source in the current-transformer equipment, the heat affects safe operation seriously, so the radiator design is very important. Taking a certain kind of IGBT as an example, the operating power consumption was analyzed and calculated, the design method of the radiator was studied, and the modeling of radiator with software of SolidWorks was designed, which was exported into the finite element analysis software of Ansys, making the thermal simulation combining the reality of IGBT operating environment, and comparing the cooling effect of different radiator configuration. A theory method was provided for the design of the IGBT radiator. An actual experiment in a hardware platform was carried on to confirm the validity of the simulation.
Keywords: IGBT power consumption; radiator; thermal simulation; Ansys
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
面向教学的数据可视化图表交互系统研究
强津培,戴松
(北京航空航天大学虚拟现实国家重点实验室,北京 100191)
摘要:实现了数据驱动的数据可视化交互系统。根据数据可视化模型,设计了数据输入、可视化模板选择、可视化编辑、模型编辑、保存输出等模块,通过调用D3HighchartsjQueryJavaScript封装库与浏览器DocumentObjectModel事件进行绑定实现。将可视化平台运用到不同学科的教学实例,实现对数据可视化技术的评价。实践表明,本平台不仅能够满足跨学科的教学平台功能,能够通过可视化技术和交互技术,激发学生的学习兴趣。
关键词:数据可视化;教学应用;交互系统;可视化图表
中图分类号:TP312?? ???文献标识码:A??? ??文章编号:1004-731X (2016) 09-2101-08
Data Visualization and Interactive System Facing Educational Practice
Qiang Jinpei, Dai Song
(State Key Laboratory of Virtual Reality Technology, Beihang University, Beijing 100191, China)
Abstract: The data-driven visualization interactive system was implemented. According to the data visualization models, five modules were designed, which were the input module, visualization template module, visual editing module and output module. It was implemented by calling the D3, jQuery and other JavaScript library and binding the events with browser DOM. The visualization system was applied to educational practice in different disciplines which realized the evaluation of data visualization technology. Practice shows that the platform can not only meet education demand of cross-disciplinary but also simulate students’ interest in learning through visualization and interactive technology.
Key words: Data Visualization; Educational Practice; Interactive System; Chart Visualization
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
传动装置装配关系动态建立方法研究
张清华,闫清东,姚寿文,刘吉林,王瑀
(北京理工大学,北京 100081)
摘要:在目前虚拟装配研究中,零件装配关系大多依赖CAD模型已有装配关系,不支持随设计意图改变而动态建立装配关系且研究对象没有针对复杂装配体。提出一种基于装配特征的传动装置装配关系动态建立方法。给出装配特征及特征面定义,抽象出传动装置中典型装配特征、特征参数和几何元素;从4个层次进行零件信息模型表达;研究包含装配干涉检查、特征匹配、装配运动导航和装配到位检查的装配关系动态建立过程。试验证明,该方法可实现传动装置装配关系动态建立,能够为装配序列规划提供技术基础。
关键词:装配特征;虚拟装配;装配关系;传动装置
中图分类号:TP391.9????? 文献标识码:A??? ???文章编号:1004-731X (2016) 09-2109-09
Research on Dynamic Construction of Assembly Relation of Transmission Device
Zhang Qinghua, Yan Qingdong, Yao Shouwen, Liu Jilin, Wang Yu
(Beijing Institute of Technology, Beijing 100081, China)
Abstract: Currently, virtual assembly research only focuses on the assembly relations of parts which are defined in cad software, and it is unable to dynamically construct or change parts’ assembly relations. Most of the research objects are simple geometry assembly, no complex structural assembly. To solve the problems efficiently, a dynamic assembly relation modeling method was proposed based on assembly feature. In the first part, the concepts of assembly feature and assembly feature plane were introduced. The assembly characteristic parameters and geometric elements were extracted from the typical assembly feature types which were defined based on the parts of the transmission. Then the parts information model was expressed from four levels. In the third part, the dynamic assembly relation modeling algorithm was proposed based on the assembly interference checking, the assembly feature matching, the assembly motion navigation and assembly inspection. The experiment proves that the method can realize the dynamic construction of assembly relation.
Keywords: assembly feature; virtual assembly; assembly relation; transmission device
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
吸音板搬运机械手联合动力学仿真分析与优化
肖艳军,冯华,王昭,王永庚
(河北工业大学机械工程学院,天津 300130
摘要:搬运机械手作为吸音板装箱环节的重要组成部分,其效率和运行稳定性对装箱效果起着决定性作用。机械手横移的启动加速度过大,吸音板将会滑移磨损;而机械手固有频率与电机的激励频率接近时,会造成机械手的剧烈抖动。针对上述问题对现场的机械手进行ADAMSANSYS联合动力学仿真分析,得到了加速时间为0.1 s时重要部件受力情况及横移关键位移处的低价固有频率,并在此基础上进行了相关的参数优化与结构改进,在相同工况下再次仿真分析并在工程实践中进行了验证。分析与验证结果表明:仿真结果与实际使用过程中的搬运机械手工作情况具有较高的一致性,对指导现场安装调试具有十分重要的工程意义。
关键词:搬运机械手;动力学;联合仿真;稳定性
中图分类号:TP391.9????? 文献标识码:A??? ???文章编号:1004-731X (2016) 09-2118-08
Joint Dynamics Simulation Analysis and Optimization in Carrying Manipulatored7ag8879环亚手机|首页主页
of Sound-absorbing Board Packing Device
Xiao Yanjun, Feng Hua, Wang Zhao, Wang Yonggeng
(School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130, China)
Abstract: As an important part of the sound-absorbing board packing device, the efficiency and operational stability of carrying manipulator play a decisive role on packing. When the natural frequency of carrying manipulator is close to the excitation frequency of motor, the carrying manipulator will shake violently. In response to above problems, we put joint dynamic simulation analysis of ADAMS and ANSYS Workbench on the carrying manipulator which is in use. We got the important components’ stress situation with the acceleration time of 0.1 s and the low-order natural frequency of the traverse key displacement in return. And on this basis we carried out partial optimization of relevant parameters and structural improvement. After then, we put simulation analysis on the carrying manipulator under the same conditions again and verified in engineering practice. Analysis and verification results show: The results of simulation have an important engineering significance to guide the installation and commissioning works on-site.
Keywords: carrying manipulator; dynamic; joint simulation; stability
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
动态环境下的多无人机协同任务规划仿真
乔体洲,郭新平,李亚威,张文军,尹中义
(中国航天电子技术研究院无人机系统工程研究所,北京 100094)
摘要:为解决无人机编队协同任务规划的仿真问题,提出了一个基于HLA/RTI的并行仿真架构进行协同任务规划仿真,通过真实的无人机气动力学仿真和飞控仿真,可以更真实有效地验证算法方案。通过建立无人机的损失概率模型,优化路径时将环境中的不确定性因素和威胁因素考虑在内。通过将每架无人机的失败概率模型与其它所有无人机的选定任务设定耦合联系可以提升协同真实性。为了尽可能实现理想的任务目标,使用随机仿真模型设计协作规划,最大程度提高无人机间的协作关系以提升生存概率。
关键词:无人机;协同;任务分配;路径规划;动态环境;随机环境
中图分类号:TP391.9????? 文献标识码:A??? ???文章编号:1004-731X (2016) 09-2126-07
Cooperative Task Assignment Simulation of Multi-UAVs in Dynamic Environments
Qiao Tizhou, Guo Xinping, Li Yawei, Zhang Wenjun, Yin Zhongyi
(UAV Systems Engineering Institute, China Aerospace Electronics Technology Research Institute, Beijing 100094, China)
Abstract: In order to address the problem of cooperative task assignment for multiple UAVs, a parallel simulation framework was proposed for cooperative task planning based on HLA/RTI simulation through UAV aerodynamic simulations and flight control simulation, which could be more real and effective algorithm validation. The paths were optimized to account for randomization and threats in the environment by modeling the probability of UAV loss. By coupling the failure probabilities of each UAV to the missions of the other UAVs, reality of cooperation was improved significantly. In order to achieve the desired objectives, the stochastic simulation models were used to design cooperation planning to enhance the cooperation between UAVs and improve survival probabilities.
Keywords: UAV; cooperation; assignment; path planning; dynamic environment; stochastic environment
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
一种针对日志数据流的实时可视化方法
李慧1,陈红倩2,杨倩玉2,陈谊2
(1. 北京联合大学管理学院,北京 100101;2. 北京工商大学计算机与信息工程学院食品安全大数据技术北京市重点实验室,北京 100048)
摘要:针对网络考场中的常规监考手段无法及时发现网络作弊的问题,提出了一种针对网络考场监控日志数据流的可视化方法。该方法以网络考场的监控日志数据流作为处理对象,对数据流进行实时可视化,以及时发现考试过程中的异常行为。首先将实时采集到的日志数据,根据日志规则分解为考生、考试机、题目等主要信息;根据考生的首次日志记录信息,建立考生/考试机对应信息表;然后针对每一条接收到的日志,将其主要信息元素与可视化元素进行映射,将整个考场中所有学生的考试状态呈现在同一可视化结果中。一旦有考生存在作弊等异常行为,可视化结果中能够实现明显的提醒,并能对考生进行行为分析。实验结果表明,文中方法能够对日志数据流数据进行实时展示,文中的数据处理方法能够满足实时交互需求。
关键词:数据可视化;流数据可视化;日志可视化;时序数据;在线考场
中图分类号:TP391.9????? 文献标识码:A??? ???文章编号:1004-731X (2016) 09-2133-06
Real-time Visualization Method for Log Data Stream
Li Hui1, Chen Hongqian2, Yang Qianyu2, Chen Yi2
(1. College of Management, Beijing Union University, Beijing 100101, China; 2. Beijing Key Laboratory of Big Data Technology for Food Safety, School of Computer and Information Engineering, Beijing Technology and Business University, Beijing 100048, China)
Abstract: To discover the network cheating behavior in the online examination room in real time, a log data flow visualization method was proposed. The monitoring log data flow was used as the data source of the method. The candidates, the examination machine and other information were extracted according to the rules of the log. The correct candidate/machine corresponding relationship was established according to the first related log record information. The main information elements were mapped to the visual elements for each log data. All students' status and behavior were presented in the same visual result. A clear reminder will be achieved once there are cheating and other abnormal behavior. The experimental results show that the method is able to show the log data stream data in real time. The data processing method can adapt to real-time interaction.
Keywords: data visualization; data stream visualization; log visualization; time series data; online examination
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
基于多尺度张量空间的改进Itti视觉显着性检测
王仕民,叶继华,程柏良,王明文
(江西师范大学计算机信息工程学院,江西 南昌 330022)
摘要:针对内部致密均匀且边界清晰明确图像,显着性方法检测得到显着性区域边界不精确且比较模糊,使得目标物体不连通问题,提出了基于多尺度张量空间的改进Itti视觉显着性检测算法,该方法引入张量空间特征,保存了原始图像特征的空间结构和相关性,可以很好的获取内部致密均匀图像的特征,使得目标物体连通,并结合显着性检测算法完成特征提取及目标检测。实验结果表明:检测算法提取的显着性区域结果更加接近对象实际边缘,达到更好的检测效果。
关键词:显着性检测;张量空间;多特征融合;多尺度变换
中图分类号:TP301????? 文献标识码:A??? ???文章编号:1004-731X (2016) 09-2138-08
Improved Itti Visual Saliency Detection Based on Multi-scale Tensor Space
Wang Shimin, Ye Jihua, Cheng Bailiang, Wang Mingwen
(College of Computer Information and Engineering, Jiangxi Normal University, Nanchang 330022, China)
Abstract: In view of internal dense uniform and clear borders image, through the saliency detection the target boundary is vague, so that the target object is not connected. In order to solve this problem, an improved Itti visual saliency detection method based on multi-scale tensor space was proposed. The method introduced the tensor space features, which preserved the original image spatial structure and correlation features, that could extract internal dense uniform image features, which made the target object connect, combining with saliency detection algorithm to finish feature extraction and target detection. Experimental results show that the proposed method can clearly and accurately extract saliency regions and achieve better detection results.
Keywords: saliency detection; tensor space; multi-feature fusion; multi-scale transform
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
一种基于多特征融合的单目俯视行人检测
唐春晖1,2
(1. 上海理工大学光电信息与计算机工程学院教育部光学仪器与系统工程研究中心, 上海 200093;ed7ag8879环亚手机|首页主页
2. 上海理工大学光电信息与计算机工程学院上海市现代光学系统重点实验室, 上海 200093
摘要:目前行人检测方面的研究一般建立在行人竖直站立姿势的平视图上,在实际应用中,有时需要从不同的视角检测行人。针对俯视的行人,提出了一种基于矩形分块特征、目标颜色均匀、目标类圆等多特征融合的俯视行人人头检测方法通过检测人头替代检测整个行人。系统采取遍历搜索的方式在整张图像上检测目标,先将所有候选目标通过级联的多矩形分块特征检测,快速过滤绝大部分不含目标的背景信息;接着通过计算矩形分块灰度的方差检测目标的颜色均匀特征;通过Hough变换检测目标轮廓的圆弧特征确认目标。实验验证了该方法的有效性。
关键词:客流计数;俯视行人的检测;矩形分块特征;霍夫变换
中图分类号:TP391.4????? 文献标识码:A?????? 文章编号:1004-731X (2016) 09-2146-08
Zenithal Pedestrian Detection Using Multiple Feature Fusion in Monocular Vision
Tang Chunhui1,2
(1. Engineering Research Center of Optical Instrument and System of Ministry of Education, School of Optical Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; ?2. Shanghai Key Laboratory of Modern Optical System,ed7ag8879环亚手机|首页主页
School of Optical Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China)
Abstract: There were extensive literatures on pedestrian detection, mostly supposed that visible humans were observed in flat view. Sometimes pedestrian detection from another perspective should be considered. The pedestrian detection with a vertical view camera was taken into account, which was usually used to count the pedestrian number. A method is put forward for zenithal pedestrian detecting based on rectangular partition featuresexhaustive scanning to find targets in an image and so all the candidates are put into a series of rectangular feature in cascade and most candidates without objects can quickly be filtered out. Then the final targets can be got by calculating the intensity variance of rectangular block to detect target color uniformity, and using the Hough Transform to detect arc contour of targets. Experiments verify it effective., in which the pedestrian head detection takes place of the body detection. It is by the
Keywords: passenger counting; zenithal pedestrian detection; rectangle partition feature; Hough Transform
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
KD树索引策略下紧支撑径向基函数的点云建模
李佳1,2,3,4,段平1,盛业华2,3,4,吕海洋2,3,4,张思阳2,3,4
(1.云南师范大学旅游与地理科学学院,云南 昆明 650500;2.虚拟地理环境教育部重点实验室(南京师范大学),江苏 南京 210023;3. 江苏省地理环境演化国家重点实验室培育建设点,江苏 南京 210023;4.江苏省地理信息资源开发与利用协同创新中心,江苏 南京 210023)
摘要:采用紧支撑径向基函数(Compactly Supported Radial Basis Function,CSRBF)对点云进行建模和可视化表达会因穷举搜索问题导致计算机内存溢出,最终引起建模和可视化失败。KD树索引具有快速搜索点的优点且避免了穷举搜索问题,将KD树索引和CSRBF插值模型相结合,提出KD树搜索策略下的CSRBF点云建模与表达方法。建立点云数据的KD树索引,采用CSRBF构建点云的隐式曲面函数模型,通过Marching Cubes算法对建好的模型进行有效的可视化表达。采用经典的兔子点云进行实验验证,结果表明KD树索引搜索策略下CSRBF的点云建模与表达方案可行。
关键词:点云;建模;KD树;紧支撑径向基函数
中图分类号:TP391.41????? 文献标识码:A??? ???文章编号:1004-731X (2016) 09-2154-05
Point Cloud Modeling Based on Compactly Supported Radial Basis Function
under KD Tree Index Strategy
Li Jia1,2,3,4, Duan Ping1, Sheng Yehua2,3,4, Lü Haiyang2,3,4, Zhang Siyang2,3,4
(1. School of Tourism and Geographical Sciences of Yunnan Normal University, Kunming 650500, China;ed7ag8879环亚手机|首页主页
?2. Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Nanjing 210023, China;ed7ag8879环亚手机|首页主页
3. State Key Laboratory Cultivation Base of Geographical Environment Evolution (Jiangsu Province), Nanjing 210023, China;ed7ag8879环亚手机|首页主页
4. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China)
Abstract: Modeling constructed by Compactly Supported Radial Basis Function (CSRBF) and visualization will fail. The main reason is that exhaustive search results in out of memory. KD tree can void exhaustive search due to the advantage of quickly searching. CSRBF combined KD tree was used to construct point cloud model. Modeling approach of CSRBF based on KD tree was proposed. KD tree index of the point cloud was constructed. CSRBF interpolation method was used to construct implicit function model of point cloud. Marching Cubes algorithm was to display model in 3D manner. The experimental results with rabbit point cloud show that it is feasible for point cloud modeling with CSRBF based on KD tree.
Keywords: point cloud; modeling; KD tree; compactly supported radial basis function
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
结合GAC与图割模型的彩色纹理图像分割方法
杨勇1,2,3,郑良仁1,郭玲1,叶阳东3
(1. 黄河科技学院信息工程学院,郑州 450063;2. 郑州工业应用技术学院 郑州 450000;3. 郑州大学信息工程学院,郑州 450060
摘要:提出了一种测地线活动轮廓模型(GAC)与多层图割模型相结合的彩色纹理图像分割方法。将Chan-Vese模型扩展到多类测地线活动轮廓模型,通过对每个类别进行高斯概率密度描述,它打破了区域内部恒定密度的假设。且在边缘约束项中引入了测地线,因此,它能够捕获具有凹性的边缘对于多类能量函数的最小化,通过构建多层图割模型,利用最大流/最小割的方法可快速求得全局近似最优解。最终通过实验验证了提出的方法能够捕获凹型边界、且量化准确率高。
关键词:彩色纹理;测地线;活动轮廓;图像分割;多层图割模型
中图分类号:TP391.04????? 文献标识码:A?????? 文章编号:1004-731X (2016) 09-2159-10
Color-texture image segmentation approached7ag8879环亚手机|首页主页
designed by integrating geodesic active contour model and multilayer graph cut model
Yang Yong1,2,3, Zheng Liangren1, Guo Ling1, Ye Yangdong3
(1. School of Information Engineering, Huang He Science and Technology College, Zhengzhou 450063, China; ed7ag8879环亚手机|首页主页
2. Zheng Zhou University of Industrial Technology, Zhengzhou 450000, China;
3. School of Information Engineering, Zheng Zhou University, Zhengzhou 450060, China)
Abstract: An approach of color-texture image segmentation was proposed based on geodesic active contour model and multilayer graph cut model. As the clustering centers were commonly descripted with constant densities, the two phase Chan-vese model was extended to multiphase geodesic active contour model by using the Gaussian distribution to describe the changing density for each phase, and meanwhile the geodesic active contour was added into the proposed model, so that the presented approach could capture out the concave edge. For the minimization of the proposed energy function, a corresponded multilayer graph cut model was designed for resolving global approximated minimization by adopting maximum flow/minimum cut algorithm. Through the comparison experiment, the superiority of the proposed method can capture the concave boundary, which owns higher accuracy of the quantitative results.
Keywords: color-texture; geodesic; active contours; image segmentation; multilayer graph cut model
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
一种基于梯度与视觉显着度的图像缩放方法
蔡兴泉1,布尼泓灏1,乔雨晴1,2,柳静华1,3,李凤霞4
(1. 北方工业大学计算机学院, 北京 100144; 2. 肯尼索州立大学新媒体系, 美国 亚特兰大 30060; ed7ag8879环亚手机|首页主页
3. 兴唐通信科技有限公司, 北京 100191; 4. 北京理工大学智能信息技术北京市重点实验室, 北京 100081)
摘要:提出了一种面向移动应用的基于梯度与视觉显着度的图像缩放方法。对原图像灰度化后,考虑邻域像素的梯度影响,计算图像梯度能量矩阵;建立视觉显着度模型,将视觉显着度能量矩阵与图像梯度能量矩阵加权相加,得到复合能量矩阵;根据复合能量矩阵,计算图像的累计最小能量矩阵和能量最小轨迹矩阵,计算图像的最小能量缝合线;采用水平垂直穿插顺序,对缝合线进行删除或插入实现图像缩放。结果表明,梯度能量与视觉显着度能量加权的复合能量图像能更好的识别图像目标区域;进行缩放时,丢弃了特征不明显的背景,保留了目标图像特征,明显优于传统方法。
关键词:图像缩放;视觉显着度;梯度能量;最小能量缝合线
中图分类号:TP391????? 文献标识码:A?????? 文章编号:1004-731X (2016) 09-2169-07
Image Resizing Method Based on Gradient and Visual Saliency
Cai Xingquan1, Buni Honghao1, Qiao Yuqing1,2, Liu Jinghua1,3, Li Fengxia4
(1. School of Computer Science, North China University of Technology, Beijing 100144, China;ed7ag8879环亚手机|首页主页
2. Department of New Media, Kennesaw State University, Atlanta 30060, USA;?3. Xingtang Communications Technology Co. Ltd, Beijing 100191, China;ed7ag8879环亚手机|首页主页
4. Beijing Laboratory of Intelligent Information Technology, Beijing Institute of Technology, Beijing 100081, China)
Abstract: In order to delete the image region without obvious features, and not damage the main features of the target for mobile applications, the image resizing method was provided based on gradient and visual saliency. The original image was grayed, and the gradient energy matrix from the gradient of neighborhood pixels was obtained. The complex energy matrix was obtained by weighted sum of visual saliency energy and image gradient energy matrix. The cumulative energy matrix and minimal energy trajectory matrix were calculated, and the minimal energy seam of image was got. The image resizing was completed by deleting the minimal energy seam in horizontal vertical interspersed sequence. The experiments results show that the complex energy matrix combined the gradient energy with visual saliency energy can recognize target object better, and this method discards the background without obvious features and preserves target object features.
Keywords: image resizing; visual saliency; gradient energy; minimal energy seam
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
启发式轮廓线不变的网格自适应简化算法
周文,贾金原
(同济大学软件学院,上海 201804)
摘要:在大规模的三维模型检索中,快速提取特征是非常重要的。简化网格的数量,但不改变模型外在形态,这样既保持特征不变,又提高提取特征的速度。提出了基于十字链表的索引结构的自适应简化算法的框架,自适应选择简化比率。对网格计算主曲率,选择合适的边入并进行简化。实验中,模型进行分组比较,程序都能够很快进行简化操作。同时,还进行了简化效率和提出的算法和半边数据结构的算法的对比实验,发现提出的算法在时间耗费有明显优势。进行提取了启发式轮廓线和自适应算法的对比实验,表明算法在时间上具有比较优势。
关键词:模型检索;十字链表;自适应;主曲率;堆;启发式轮廓线
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2016) 09-2176-10
Self-adaptive Simplification Algorithm for Suggestive-contours preserving
Zhou Wen, Jia Jinyuan
(School of software engineering, Tongji University, Shanghai 201804, China)
Abstract: It is important that features quickly extract in large-scale model retrieval. The preprocessing of 3D model simplified the mesh, not changed the contours. Based on the data structure of the cross linked list, a framework for self-adaptive algorithm was proposed, according to mesh structure, it automatically selected the rate to simplify. Besides, by computing the related mesh principal curvatures, the edge that some condition was met, were put in the structure of heap for simplification operating. In the experiment, the models were divided into the complex model and the common model. The program could simplify the operation of the mesh. Moreover, the comparative experiment of mesh simplification efficiency was conducted. It could be found that the efficiency of complex model was less than common model. Besides, the different methods were compared, the proposed method was better in time consuming facet. Then, extracted suggestive contours experiment was done. The result show proposed method is better. The best simply rate can been computed by the proposed self-adaptive algorithm.
Keywords: model retrieval; cross linked list; self-adaptive; principal curvature; heap; suggestive contours
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
基于统计分类的行人检测方法综述
李威1,2,王鹏杰2,宋海玉2
(1. 吉林大学交通学院,长春 130012;2. 大连民族大学计算机科学与工程学院,大连 116605)
摘要:作为计算机视觉以及智能交通领域一个重要的研究方向,行人检测技术近年来受到业界广泛关注,其中基于统计分类的方法因为其检测效果好,得到了广泛应用。对基于统计分类的行人检测方法进行综述,归纳了目前用于行人检测的数据集,并给出了每个数据集中各种样本的分布情况;接着总结了行人检测方法中用于目标识别的行人特征及其改进方式;对行人检测主要分类器做了概述;指出了行人检测目前存在的问题并展望了未来的发展方向。
关键词:综述;行人检测;统计分类;数据集
中图分类号:TP391.41?? ???文献标识码:A?????? 文章编号:1004-731X (2016) 09-2186-09
Survey on Pedestrian Detection Based on Statistical Classification
Li Wei1,2, Wang Pengjie2, Song Haiyu2
(1. School of Transportation, Jilin University, Chanchun 130012, China; ed7ag8879环亚手机|首页主页
2. College of Computer Science and Engineering, Dalian Minzu University, Dalian 116605, China)
Abstract: As one of the most important areas of research in the domain of computer vision and intelligent tranffic, pedestrian detection has attacted extensive interest from the research community in recent years. Because the detection based on statistical classification method is efficient, it has been widely applied. Pedestrian detection method was focused based on statistical classification. Standard dataset for evaluation of human detection was reviewed, studying the statistics about these dataset. Extracted features and the improvement on them were summarized. The main classifier for pedestrian detection was summarized. The present problems and future research trends in pedestrian detection were proposed.
Keywords: survey; pedestrian detection; statistical classification; dataset
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
基于随机子图表示的云环境人脸图像隐秘检测
袁鹏1,2,金鑫1,李晓东1,赵耿1,吴亚明1,2,马铭鑫1,2,田玉露1,陈迎亚1
(1. 北京电子科技学院,北京 100070;2. 西安电子科技大学,西安 710071)
摘要:为了在云端服务器中进行终端用户的人脸图像检测的同时能够保护双方的数据隐私,提出了一种基于随机子图表示的人脸图像隐秘检测方法。终端将原图像根据随机子图产生算法划分为2值的子图像加权和,将子图像的权值随机排序,将子图像按照权值随机排列的顺序发给云端服务器。云端服务器利用其人脸检测算法对子图像进行检测,终端根据随机子图分解合并检测结果。端和终端都引入了随机数机制,以保护终端的人脸图像信息和云端的人脸检测算法参数。该方法的创新点是提出了随机子图算法并应用于图像的人脸检测中,使云端隐私保护的人脸检测得以实现。
关键词:云端;人脸检测;隐秘;随机子图;随机数
中图分类号:TP319?? ?????文献标识码:A???????? 文章编号:1004-731X (2016) 09-2195-06
Private Face Detection Based on Random Sub-images in Cloud
Yuan Peng1,2, Jin Xin1, Li Xiaodong1, Zhao Geng1, Wu Yaming1,2, Ma Mingxin1,2, Tian Yulu1, Chen Yingya1
(1. Beijing Electronic Science and Technology Institute, University, Beijing 100070, China; 2. Xidian University, University, Xi’an 710071, China)
Abstract: In order to detect faces of terminal face image in the cloud at the same time protect both privacy of data,a method of face images privacy detection based on random sub-Images representation was proposed. Terminal divided original image into 2 value sub-images weighted sum based on random sub-images generation algorithm and randomly arranges weights of sub-images. Terminal sent sub-images according to the weights of random sequence to the cloud server. Cloud server detected sub-images with its face detection algorithm. Terminal merges test results based on random sub were exploded. Two random vectors were leveraged to protect the parameters of the trained face detector and the content of the terminal image. The innovation of this method is that the random sub-images thought is proposed and is applied to the image face detection making privacy face detection achieve in the cloud.
Keywords: cloud;face detection; privacy; random sub-image;random vectors
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
一种新的单船进出港模拟训练航迹评估算法
方诚1,2,任鸿翔1,金一丞1
(1. 大连海事大学航海动态仿真和控制实验室,大连 116026;2. 浙江交通职业技术学院,杭州 311112)
摘要:单船进出港模拟航行评估是国家海事局评估海船船员船舶操纵能力的基础考题类型。为了评估单船进出港模拟训练的航迹,根据调研分析,在构建航迹评价指标体系的基础上,建立单船进出港模拟训练航迹综合评价模型。为了通过已评航迹的评分值定量化评估待评航迹评分值,提出基于二维正态云模型参数的单船进出港模拟训练航迹云相似度评估算法,并通过仿真算例验证算法的可行性,为从定量化角度评估单船进出港模拟训练航迹提供新方法。
关键词:进出港船;模拟训练;云相似度;航迹评估算法
中图分类号:TP391.9????? 文献标识码:A??? ???文章编号:1004-731X (2016) 09-2201-06
New Evaluating Algorithm of the Single Ship Track When Inward/outward Port ed7ag8879环亚手机|首页主页
Based on Ship-handling Simulator Training
Fang Cheng1,2, Ren Hongxiang1, Jin Yicheng1
(1. Marine Dynamic Simulation & Control Lab. of DMU, Dalian 116026, China; ed7ag8879环亚手机|首页主页
2. Zhejiang Institute of Communications, Hangzhou 311112, China)
Abstract: The simulating navigation evaluation of the single ship when inward/outward port was a basic kind of examination type in maritime safety administration’s ship maneuvering ability test question system. In order to evaluate the track of the single ship when inward/outward port based on ship-handling simulator training. Constructed the track of evaluation index system by the investigation and analysis, established acomprehensive evaluation model of the single ship’s track when inward/outward port. In order to quantitative evaluate the score of unevaluated track by compared with the evaluated track score, a new evaluating cloud similarity algorithm of the single ship track when inward/outward port based on the parameters vector of two-dimensional cloud model is proposed, the simulation results show the algorithm is feasible, and it provides a new quantitative evaluation method to evaluate the single ship track when inward/outward port.
Keywords: the inward/outward port ship; simulator training; cloud similarity; track evaluation algorithm
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
基于Leap Motion小鼠卵巢切割模拟算法
李浩1,杨猛1,2,胡杰1,焦昊1,翟莹1,郄薇1,杨刚1
(1.北京林业大学信息学院,北京 100083;2.中国科学院软件研究所计算机科学国家重点实验室,北京 100190)
摘要:提出一种基于Leap Motion的对小鼠卵巢进行切割的实验模拟方法。精确采集小鼠各主要器官的真实形态数据;然后对这些数据特征进行深入分析,并利用3ds MAX进行精细建模;将三维模型导入Unity3D中,搭建虚拟实验环境并创建Leap Motion接口;通过基于碰撞点形成平面的切割算法来实现对小鼠卵巢的切割模拟,并通过基于运动学的形变算法实现形变模拟。该切割算法通过虚拟器械与模型网格的碰撞,以碰撞点和摄像机形成的平面对模型网格进行切割和网格重建。实验结果表明:该算法能够真实、有效地对小鼠卵巢模型的切割进行模拟,同时能够真实再现现实实验的操作体验。
关键词:生物实验;虚拟交互;Leap Motion;切割算法;形变算法
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2016) 09-2207-07
Algorithm of Simulation of Cutting Mouse’s Ovary Based on Leap Motion
Li Hao1, Yang Meng1,2, Hu Jie1, Jiao Hao1, Zhai Ying1, Qie Wei1, Yang Gang1
(1. School of Information Science and Technology, Beijing Forestry University, Beijing 100083, China;
2. The State Key Laboratory of Computer Science, Institute of Software, Chinese Academy of Sciences, Beijing 100190, China)
Abstract: A cutting algorithm was proposed for Mouse’s ovary model based Leap Motion. The realistic data of the main mouse organs were collected. These data were deeply analyzed. The models of mouse and organs were imported into Unity3D to create a virtual environment and an interface between Leap Motion and Unity3D. It realized the cutting on mouse’s ovary model through a cutting algorithm which created a plane formed by the collision points and the camera, and it realized the deformation of the mouse’s ovary model through a deformation algorithm based kinematic formula. The results show that the cutting algorithm can simulate the cutting experiment on mouse’s ovary effectively and make the people have a realistic experience.
Keywords: biotic experiment; virtual interaction; leap motion; cutting algorithm; deformation algorithm
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
结合互信息量和Log-Gabor特征的嵌入式人脸识别
叶继华,兰清平,刘长红,王仕民
(江西师范大学计算机信息工程学院,江西 南昌 330022)
摘要:Log-Gabor函数在高频端有个延长的尾巴,能有效改善普通Gabor函数低频表示不足而高频过度表示的缺点,且Log-Gabor滤波器无直流分量,带宽不受限制,比Gabor滤波器更适于提取人脸特征。一幅人脸图像经4个尺度6个方向的Log-Gabor滤波器组成的滤波器组特征提取之后,数据量是原来的24倍,而嵌入式设备资源有限,难以处理如此多的数据。提出了结合互信息量和Log-Gabor特征的嵌入式人脸识别方法。该方法使用Log-Gabor滤波器组对人脸图像进行特征提取,利用互信息量计算权值,然后用权值将Log-Gabor特征进行融合,并使用2DPCA进一步降维,最后运用最近邻分类器进行识别。实验结果表明,该方法能够在保持识别率的情况下,有效缩短识别时间。
关键词:人脸识别;Log-Gabor特征融合;嵌入式;互信息量;2DPCA
中图分类号:TP391????? 文献标识码:A??? ???文章编号:1004-731X (2016) 09-2214-06
Embedded Face Recognition Combined Mutual Information with Log-Gabor Feature
Ye Jihua, Lan Qingping, Liu Changhong, Wang Shimin
(College of Computer Information Engineering, Jiangxi Normal University, Nanchang 330022, China)
Abstract: Log-Gabor functions have extended tails at the high frequency end, can effectively improve the shortcoming of ordinary Gabor functions which would over-represent the low frequency components and under-represent the high frequency components, and Log-Gabor filter has no DC components, the bandwidth is not limited, so Log-Gabor filter is more suitable than Gabor filter to extract the face feature. After extracting features of a face image by a Log-Gabor filter bank which is composition of four scales and six orientations, the amount of data is 24 times of the original, but the embedded equipment resources are limited, it is difficult to deal with so many data. An embedded face recognition approach combined mutual information with Log-Gabor feature was proposed. A bank of Log-Gabor filters was applied on face images to extract features, mutual information was adopted to calculation weights, then the weights were used to fusion the Log-Gabor features. Two Dimensional PCA (2DPCA) was used to reduce dimensions. The nearest neighbor classifier was employed for classification. The experimental results show that the method can effectively reduce the recognition time in the case of keeping the recognition rate.
Keywords: face recognition; Log-Gabor feature fusion; embedded; mutual information; 2DPCA
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
触觉再现的分层电磁式盲文点显器
吴新丽,祝盼飞,杨文珍,金中正,宣建强,许艳,竺志超
(浙江理工大学虚拟现实实验室,杭州 310018)
摘要:盲文点显器是触觉再现研究的重要应用。研发了一种分层电磁式盲文点显器的原型样机,包括机械本体和控制系统两部分,可以动态显示20方盲文。创新设计出分层且错位布置的盲文触点驱动机构,机械本体实现了120个盲文触点的空间排布;通过控制电磁线圈的通断电,控制系统驱动盲文触点独立上下运动,动态组合出不同的盲文字符。此原型样机体积小、成本低、刷新频率高,可生成足够的支撑力,供指尖触觉阅读盲文
关键词:盲文点显器;电磁驱动;触觉再现;盲人
中图分类号:TP242.3??????? 文献标识码:A??????? 文章编号:1004-731X (2016) 09-2220-08
Layered Electro-magnetic RefreshableBraille Display with Haptic Rendering
Wu Xinli, Zhu Panfei, Yang Wenzhen, JinZhongzheng, Xuan Jianqiang, Xu Yan, Zhu Zhichao
(Virtual Reality Laboratory of Zhejiang Sci-Tech University, Hangzhou 310018, China)
Abstract:Refreshable braille display is an important application of haptic rendering in virtual reality.Aprototype of a layered electro-magnetic refreshablebraille displaywas developed, which has complex mechanical structures and a control system, and coulddynamical display of20braille words. By designing the layered and dislocatedbraille driving mechanism, this refreshablebraille displayrealizedthe arrangement of 120 braille points. By switchingthe current of the electromagnetic coils, the control system of this refreshablebraille displayrealizedthe movement control of these braille points. This prototype has the advantages of small volume, low cost, high refresh rate, and can generate enough supporting forcefor fingertip haptic reading braille.
Keywords: refreshable braille display; electro-magneticdriving; haptic rendering; the blind
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
基于金字塔变换跨尺度代价聚合的立体匹配
姚莉1,2,3,刘助奎3,王秉凤3
(1.计算机网络和信息集成教育部重点实验室(东南大学),南京 211189;2.计算机软件新技术国家重点实验室(南京大学),南京 210023;3.东南大学计算机科学与工程学院,南京 211189)
摘要:人眼视觉系统在不同尺度上处理接收到的视觉信号,而传统的立体匹配算法都在原立体匹配图像对最大尺度下进行立体匹配,在低纹理区域、无纹理区域立体匹配错误率高。模拟人眼视觉系统在多个尺度上进行立体匹配,再融合不同尺度下的匹配结果能减少错误率。通过改进一种基于高斯金字塔变换跨尺度代价聚合的立体匹配方法,在原框架上,在代价聚合阶段加入拉普拉斯金字塔变换,在视差精细化阶段加入基于加权联合双边滤波的视差精细化方法,使新框架能获得比原论文更好的视差图。
关键词:立体匹配;跨尺度;金字塔变换;加权联合双边滤波;视差精细化
中图分类号:TP391.4????? 文献标识码:A??? ???文章编号:1004-731X (2016) 09-2227-08
Stereo Matching based on Pyramid transform Cross-Scale Cost Aggregation
Yao Li1,2,3, Liu Zhukui3, Wang Bingfeng3
(1. Key Laboratory of Computer Network and Information Integration (Southeast University), Nanjing 211189, China;
2. State Key Laboratory for Novel Software Technology(Nanjing University), Nanjing 210032, China;
3. School of Computer Science and Engineering, Southeast University, Nanjing 211189, China)
Abstract: Human visual system processes the received visual signals on different scales, however, the traditional stereo matching algorithms get the disparity map from the original image in the biggest scale, which will lead to high stereo matching error rate in the area of low-texture, texture-less area. Simulation of the human visual system in stereo matching on multiple scales can reduce error rate. A stereo matching method based on the Gaussian pyramid cross-scale transform was improved, by adding the Laplace Pyramid Transform to the original cross-scale framework and adding the weighted joint bilateral filter in the disparity refinement stage. The new cross-scale framework can get a better disparity map than the original method.
Keywords: stereo matching; cross-scale; pyramid transform; weighted joint bilateral filter; disparity refinement
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
空间目标多尺度表达模型及方法
施群山1,蓝朝桢1,梁静2,卢万杰1,王栋1
(1.信息工程大学 地理空间信息学院,郑州 450002;2.郑州测绘学校,郑州 450015)
摘要:为了让用户从海量的空间目标态势信息中准确、高效的感知所需信息,引入多尺度表达思想,在多方面分析空间目标态势表达影响因素的基础上,建立多尺度表达模型,并结合Voronoi图实现空间目标多尺度表达。最后通过实验验证了模型和方法的有效性,结果表明:该方法可以有效控制空间目标态势表达的信息量和各层次态势信息的详略程度,满足空间目标表达的清晰性和易读性的要求,提高空间目标表达效果。
关键词:空间目标;多尺度模型;多尺度表达;Voronoi
中图分类号:P208;TP391????? 文献标识码:A?????? 文章编号:1004-731X (2016) 09-2235-11
Model and Method of Space Objects Multi-scale Expression
Shi Qunshan1, Lan Chaozhen1, Liang Jing2, Lu Wanjie1, Wang Dong1
(1. Institute of Surveying & Mapping, Information Engineering University, Zhengzhou 450002, China; ed7ag8879环亚手机|首页主页
2. Zhengzhou School for Surveying and Mapping, Zhengzhou 450015, China)
Abstract: To allow users to acquire accurately and efficiently information, which they need, from vast amounts of space situational information, the thought of multi-scale expression was used, on the basis of analysis of various factors, which influenced space objects expression, multi-scale expression models were established, space objects multi-scale expression was achieved combined with the construction of the voronoi diagram. The experiments were done to verify the validity of the model and methods, the results show that: this method can largely control the amount and level of detail of information, can meet the requirements of clarity and legibility of space situational expression, and can effectively improve the effect of space objects expression.
Keywords: space objects; multi-scale model; multi-scale expression; voronoi diagram
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
基于前置攻击瞄准的UCAV自主拦截方法研究
吴华兴1,2,黄伟2,康凤举1,毛红保2
(1. 西北工业大学航海学院,西安 710072;2. 空军工程大学航空航天工程学院,西安 710038)
摘要:针对无人作战飞机使用空空导弹对空中机动目标实施自主拦截的问题,提出了一种基于前置攻击瞄准偏差的自主引导策略。通过建立飞机运动模型和前置攻击瞄准模型,计算得到瞄准偏差,然后以减少瞄准偏差为飞行控制的目标,基于模型预测控制思想分别对采用比例引导和模拟退火粒子群优化方法的两种自主机动策略进行了仿真研究。仿真结果表明,在目标信息有缺失时,两种策略都能实现对不同机动目标的自主拦截,且后者拦截效果更好。
关键词:无人作战飞机;自主拦截;前置攻击瞄准;模型预测控制;比例引导;粒子群优化
中图分类号:V279?? ?????文献标识码:A???????? 文章编号:1004-731X (2016) 09-2246-08
Research on Autonomous Intercept Method for UCAV Based on Lead Attack Aiming
Wu Huaxing1,2, Huang Wei2, Kang Fengju1, Mao Hongbao2
(1. Marine College, NWPU, Xi’an 710072, China; 2. Aeronautics & Astronautics Engineering Institute of AFEU, Xi’an 710038, China)
Abstract: For the problem of autonomous intercepting moving target with air-to-air missiles for an unmanned combat air vehicle, autonomous guiding method based on lead attack aiming errors was studied. The aiming errors were computed by building the motion model of UCAV and the model of lead attack aiming. Then to meet the goal of decreasing the aiming errors during flight control, two maneuver strategies based on model predictive control approach were presented: one used proportional navigation method and the other employed simulated annealing particle swarm optimization algorithm. The simulation result shows that both strategies can implement autonomous intercept for targets with various maneuvers and the later method is better than the former if given the condition of periodic absence of target parameters.
Keywords: unmanned combat air vehicle; autonomous intercept; lead attack aiming; model predictive control; proportional navigation; particle swarm optimization
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
混合多距离图像的线性判别分析人脸识别算法
成亚玲,谭爱平,张敏
(湖南工业职业技术学院,长沙 410208)
摘要:现有应用于智能监控系统的人脸识别算法主要适用于近距离摄像,由于图像质量随距离增加快速下降的原因,其在远距离摄像条件下仍存在人脸识别精度较低的问题。为了提高远距离摄像环境下的人脸识别精度,提出了一种基于混合多距离图像和线性判别分析的人脸识别算法。该算法混合使用多种不同距离提取的图像来训练图像集,并使用双线性内插法对训练图像集归一化,使用曼哈坦距离测量相似度完成人脸识别。实验结果表明,和传统的基于近距离图像的线性判别人脸识别算法相比,本算法可以在替换和远距离条件分别提高人脸识别精确度为6.2%31%
关键词:智能监视系统;人脸识别;线性判别分析;双线性内插法;曼哈坦距离;人脸识别精确度
中图分类号:TP391.9?? ????文献标识码:A?? ????文章编号:1004-731X (2016) 09-2254-07
Face Recognition Algorithmed7ag8879环亚手机|首页主页
B
ased on Mixed Multiple Distance Image and Linear Discriminant Analysis
Cheng Yaling, Tan Aiping, Zhang Min
(Hunan Industry Polytechnic, Changsha 410208, China)
Abstract: The existing face recognition algorithms used in intelligent monitoring system are mainly applied to short distance images, which still have the problem of low face recognition rate when being applied to long distance images because the image quality decreases as the distance grows. To improve the face recognition accuracy in long distance images, a novel face recognition algorithm was proposed based on using mixed multiple different distance images and Linear Discriminant Analysis (LDA). The proposed algorithm used mixed images extracted from multiple different distances to train images, and used bilinear interpolation method to normalize the image set, and then uses the Manhattan distance to measure the similarity of images to realize the face recognition. The experimental results demonstrate that, compared to the traditional algorithm based on short single distance image and LDA, the proposed algorithm can improve significantly the face recognition rate 6.2% in short distance and 31% in long distance respectively.
Keywords: intelligent surveillance system; face recognition; linear discriminant analysis; bilinear interpolation method; manhattan distance; face recognition rate
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
基于ANNet网络的RGB-D图像的目标检测
蔡强,魏立伟,李海生,曹健
(北京工商大学计算机与信息工程学院食品安全大数据技术北京市重点实验室,北京 100048)
摘要:由于深度图像采集设备的广泛使用,使得利用RGB-D图像进行目标检测成为计算机视觉领域研究热点。为了使得利用卷积神经网络所提取的特征更具有鲁棒性,设计了一种改进的卷积神经网络(本文称为ANNet),以提高检测准确率。为了提高卷积层中局部感受区域的模型分辨能力,针对AlexNet网络中卷积层中卷积核与下层数据块的线性特性,将部分卷积层改进为带有多层感知机的非线性卷积层。在NYUD2数据集上实验,结果表明,使用改进后的网络结构,在彩色图像上的检测结果提升了3%,在RGB-D图像上的检测结果提升了4%
关键词:目标检测;卷积神经网络;AlexNet网络;RGB-D图像
中图分类号:TP391????? 文献标识码:A?????? 文章编号:1004-731X (2016) 09-2260-07
Object Detection in RGB-D Image Based on ANNet
Cai Qiang, Wei Liwei, Li Haisheng, Cao Jian
(Beijing Key Laboratory of Big Data Technology for Food Safety, School of Computer and Information Engineering,
Beijing Technology and Business University, Beijing 100048, China)
Abstract: The wide spread of depth images acquisition devices makes object detection in RGB-D images a hotspot in the field of computer vision. In order to make the features extracted by CNN more robust and to improve the detection accuracy, an improved CNN called ANNet was designed. To enhance the model discriminability of local patches within the receptive field, some linear convolutional layers in the AlexNet with nonlinear convolutional layers were replaced which contained multilayer perceptron against the linear feature between convolution filter and underlying data patch. The experiment result shows that the detection accuracy is improved by 3% in the RGB images and 4% in the RGB-D images on the NYUD2 datasets using the improved network.
Keywords: object detection; convolutional neural network; AlexNet; RGB-D images
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
基于相对视觉位姿的Stewart平台运动学标定
马瑾1,2,张国峰1,2,戴树岭1,2,曾锐1,2
(1. 北京航空航天大学虚拟现实技术与系统国家重点实验室,北京 100191;ed7ag8879环亚手机|首页主页
2. 北京航空航天大学自动化科学与电气工程学院,北京 100191)
摘要:为了提高飞行模拟器运动系统的控制精度,针对电动Stewart六自由度运动平台,利用测量相对位姿的方法进行运动学误差分析和标定。根据Stewart平台结构特点,提出回转误差及回转补偿算法。由并联机构运动学方程和矢量闭环特性,建立Stewart平台运动学误差模型及优化标定算法。采用基于容错编码技术的标记块设计方案提高测量系统的稳定性,利用Basler工业级摄像机实现对上平台位姿跟踪与测量,获取上平台相对位姿,根据标定模型及优化算法辨识系统结构误差参数并补偿。最终测量数据与实验结果验证了标定算法的有效性,提高了Stewart平台控制精度。
关键词:运动学标定;Stewart平台;误差建模;视觉位姿
中图分类号:TP391.7????? 文献标识码:A?????? 文章编号:1004-731X (2016) 09-2267-08
Kinematic Calibration of Stewart Platform Based on Relative Visual Pose
Ma Jin1,2, Zhang Guofeng1,2, Dai Shuling1,2, Zeng Rui1,2
(1. State Key Laboratory of Virtual Reality Technology and Systems, Beihang University, Beijing 100191, China; ed7ag8879环亚手机|首页主页
2. School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China)
Abstract: To improve the control accuracy of flight simulator motion system, a kinematic error analysis and calibration based on relative visual pose measurement of electric Six-DOF Stewart platform were proposed. Considering the structural characteristic of Stewart platform, a rotary compensation algorithm was concerned firstly to raise the control accuracy. Then kinematic error model and optimal calibration algorithm were established, according to kinematic equations and vector closed-loop characteristic. Latterly, pose data was achieved using Basler industrial camera and ID marker featured by CRC (Cyclic Redundancy Check) and FEC (Forward Error Correction). Finally, measurements and experiment results supported the validity of the algorithm and higher control precision was obtained.
Keywords: kinematic calibration; stewart platform; error analysis; visual pose
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
跨尺度三维场景显示精度提高技术研究
李鹏飞,周杨,许继伟,胡校飞,薛现光
(信息工程大学地理空间信息学院,郑州 450001
摘要:在跨尺度三维场景中,由于空间尺度变化非常大,单一的基准坐标系存在很大的应用局限性,当相机观察距离基准坐标系远的目标时,目标会出现抖动现象。空间目标在统一时间基准下位置和姿态不断发生变化,当相机跟随目标近距离固定观察目标的某一区域时,目标也会出现抖动。提出了基于关注目标惯性坐标系设置基准坐标系的方法,在空间尺度变化时可以有效提高显示精度。提出了基于关注目标本体坐标系设置基准坐标系的方法,当相机近距离固定观察目标时也可以有效提高显示精度。
关键词:跨尺度三维场景;浮点误差;关注目标;显示精度
中图分类号:TP391.41????? 文献标识码:A??? ???文章编号:1004-731X (2016) 09-2275-08
Research of Display Accuracy Improvement in Multi-scale 3D Scene
Li Pengfei, Zhou Yang, Xu Jiwei, Hu Xiaofei, Xue Xianguang
(Institute of Geographical Spatial Information, Information Engineering University, Zhengzhou 450001)
Abstract:: In the multi-scale 3D scene, the single reference coordinate system has much application limitation due to the large spatial scale change, so the target will appear wobble phenomenon when the camera observes the target in a large distance from the reference coordinate. Due to the fact that the position and attitude of a spatial object change all the time under the unified time datum, the target will appear wobble phenomenon when the camera following a target observes a certain area near the target. A setting method of reference coordinate system based on the observation of the inertial coordinate system was proposed, which could effectively improve the display accuracy when the space scale changed. What’s more, a setting method of reference coordinate system based on the observation of the body-fixed coordinate system was proposed, which could effectively improve the display accuracy when the camera observed the target in a short distance.
Keywords: multi-scale three-dimensional scene; floating error; observed target; display accuracy
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
SMT有界约束非集中自动机web服务模型检测
韦容1,申希兵1,杨毅2
(1.钦州学院人文学院,广西 钦州 535000;2.广西科技大学软件学院,广西 柳州 545006)
摘要:针对web服务模型检测应用中,传统的有限状态机的组合方式无法保证Web组合服务的正确性问题,提出一种基于可满足性模理论(satisfiability modulo theoriesSMT)的非集中自动机的web服务模型检测算法。利用SMT对时间自动机进行有界模型检测,将时间自动机模型直接转换成SMT可识别的逻辑公式,并进行求解;利用所提SMT时间自动机理论,实现对雇员出差安排组合web服务进行建模和验证;通过实例分析,验证了算法在解除路径死锁及网络参数指标优化上的有效性。
关键词:可满足性模理论;自动机;web服务;模型检测;大数据
中图分类号:TP391??? ????文献标识码:A???????? 文章编号:1004-731X (2016) 09-2283-06
SMT Bounded Constrained Non Centralized Automaton Web Service Model Checking
Wei Rong1, Shen Xibing1, Yang Yi2
(1. College of Humanities , Qinzhou University, Qinzhou 535000, China; ed7ag8879环亚手机|首页主页
2. College of Software, Guangxi University of Science and Technology, Liuzhou 545006, China)
Abstract: In model checking for web services applications, the combination of traditional finite state machine cannot guarantee the correctness of web service composition, a method of non centralized automaton model for web service detection algorithm was put forwardbased on which could meet of mode theory (satisfiability modulo of the nanocomposite, SMT). The SMT was used to detect the bounded model of timed automata, and the time automaton was directly converted into SMT identifiable logic formula and was solved; using the SMT timed automata theory, implementation of employee travel arrangements for composite web service was modeled and verified. Through the example analysis, verification of the algorithm in the lifting path deadlocks and network parameters optimization is effective.
Keywords: satisfiability modulo theories; automata; Web service; model checking; big data
※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
?
来顶一下
近回首页
返回首页
推荐资讯
相关文章
    无相关信息
栏目更新
栏目热门