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通过对军事禁区人员的视觉特征提取提高军事禁区的人员监控和识别能力。提出一种基于嵌入式视觉技术的军事禁区人员监控技术,系统采用4台计算机,3台显示器,虚拟现实设备设计,整个系统的控制是通过连有手控器的计算机来实现军事禁区人员的视觉特征提取,构建视觉特征提取的状态方程和观测方程,对嵌入式视觉特征进行运动属性分析和图像处理,实现人员监控特征分析算法改进。仿真结果表明,该系统能有效实现远距离视频监控和人员特征识别及嵌入式视觉定位,测距误差较低,对军事禁区人员的监控精度提高,对远程监控视频特征的场景恢复性能较好,能有效识别人员的行为和视觉特征,性能优越。 相似文献
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人体动作姿态的识别是当前研究的热点,而对于运动员技术姿态的计算是非常困难的但其应用十分广泛。针对竞技体操现场中运动员的技术姿态识别展开研究,通过监控设备对竞技体操现场进行图像采集,对图像进行关节点标定,利用加权量化矩阵表示技术姿态特征用以解决不同关节点的权重区分度问题,经过权重修正后的关节点相对坐标作为技术姿态特征用以解决标定关节点时产生的误差所造成的识别精度下降的问题,基于多种姿态特征建立技术姿态描述算子并构建特征数据库,用于训练基于支持向量机的多类分类器,以实现竞技体操现场中对体操运动员技术姿态特征的识别。实验表明,提出的方法实现了11种体操运动员运动姿态的特征识别,在识别效率和精度上具有令人满意的结果。 相似文献
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吾尔尼沙·阿不都热依 《科技通报》2014,(6)
从视频像素灰度序列中提取特定人员的状态特征,采用平面阵对特征信息进行融合处理是实现计算机视觉下特定人员定位的重要步骤。传统的人员视觉定位方法采用视频步进跟踪学习方法,在随机状态分布下的复杂环境人员进行准确定位效果不佳,提出一种基于平面圆阵定位算法的特定人员计算机视觉定位方法,提取监控视频的图像,进行视频图像的背景建模,得到高斯差分尺度空间中的背景像素灰度值,实现对特定人员的表情识别的动作判别,以此为数据基础设计平面圆阵人员定位系统,实现对暴恐等特定人员的准确锁定和跟踪识别。仿真实验表明,采用该算法准确实现1500 m远距离暴恐人员特征识别与定位,误差较小,分辨率和准确性较高。 相似文献
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大型远程行人晕厥无线监测系统关键算法设计 总被引：1，自引：0，他引：1
《科技通报》2015,(10)
在室外行人监控系统中,由于行人运动行为姿态的相似特征量较大,传统的行人行为特征识别系统不能对行人突然发生晕厥时及时有效地做出信息反馈。提出一种基于特征融合和支持向量机的大型远程行人晕厥无线监测方法。首先,采用背景差分法对行人监测图像进行提取,并将提取出的扩展梯度方向直方图和完备局部二值模式两种互补特征通过离散变换算法进行压缩和融合,然后将融合结果输入到SVM中进行学习,在寻找超优平面的过程中,在满足支持向量机分类条件下,将行人晕厥行为从行人监测视频图像中识别出来。在KTH和Weizmann行为公共数据库中进行了多组实验,结果表明,相对于其他识别模型,提高了行人晕厥监测系统的识别正确率,同时加快了识别速度。 相似文献
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基于FFT相位相关的图像匹配算法与实现 总被引：2，自引：0，他引：2
机器视觉系统以图像输入作为对外界世界的感知手段,图像匹配可用于机器视觉的识别与理解,本文提出一种基于FFT相位相关的图像匹配算法,利用傅立叶变换将图像变换为频域来计算两幅图像的相关性,从而实现图像匹配。 相似文献
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<正>随着计算机视觉技术的不断发展,智慧监控也逐渐开始进入各个行业。从城市街道到工厂车间,人们不用专门花费大量的时间与精力守在屏幕面前,也能对监控下的场景进行精准的把握和秩序的维护。但在今天大多数的考场中,依然采用传统监控和人工巡考的方式来维护考场的秩序。基于现状,国内不少学者开展对考场行为研究。李春梅等将YOLOv3算法用于考场内检测考生面部姿态以及书本等违禁物品,通过考生面部姿态以及检测可疑物品来对考生是否有可以行为进行判定。这种方法虽然能够检测到违禁物品与面部姿态,但检测的准确率较低且缺少对考生具体手部动作的判定。 相似文献
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《科技通报》2015,(8)
大型智能楼宇的逃生通道是确保人员安全的生命线,需要对其有效监控。传统的逃生通道监控系统仅采用视频监控方法,预测预警和智能分析能力不好,智能不高。提出一种基于双目视觉动态跟踪和静态测量的大型智能楼宇中的逃生通道监控系统设计方案,采用物联网结构模型,实现信息交互和控制,采用双目视觉动态跟踪技术,实现对监控运动目标的自动检测,双目动态跟踪系统配有2个高品质的光学CCD和特殊光源,监控逃生通道的二维图像,采用圆周点法进行标定,得到楼宇中逃生通道人员方位置信度,静态测量热源目标名义值与真实值间的偏差,提高监控性能,并实现实时跟踪和三维测距。仿真结果表明,设计的系统具有较好的识别率,能有效识别逃生通道中的障碍物,实现对障碍物和人员的准确定位识别,对逃生通道监控角度的配准率较高,实现智能全天候实时监控,性能优越。 相似文献
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《中国科学院院刊(英文版)》2008,22(1):2-3
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing. 相似文献
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Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors. 相似文献
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《中国科学院院刊(英文版)》2008,22(1)
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants." 相似文献
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A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007. 相似文献
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Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction. 相似文献
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Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies. 相似文献
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Puay Tang 《The Information Society》1998,14(1):19-31
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means. 相似文献
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Milton Mueller 《The Information Society》2001,17(3):151-163
Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP. 相似文献
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Prof. Raymond C.K. Chen a neuropsychologist with the CAS Institute of Psychology has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.…… 《中国科学院院刊(英文版)》2008,22(1):15-15
Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology. 相似文献
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Prof. SUN Changpu from the CAS Institute of Theoretical Physics coworkers from University of Basel in Switzerland have worked out a way - at least in theory - to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams is similar to the famous Stern-Gerlach effect whereby a beam of atoms passing through a magnetic field is split in two according to the atoms' spin states 《中国科学院院刊(英文版)》2008,22(1):23-23
Prof. SUN Changpu from the CAS Institute of Theoretical Physics and coworkers from University of Basel in Switzerland have worked out a way --at least in theory --to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams and is similar to the famous Stern-Gerlach effect, whereby a beam of atoms passing through a magnetic field is split in two according to the atoms＇ spin states （Phys. Rev. Lett. 99 130403）. 相似文献