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动态场景曝光图像较为模糊,混淆复杂,对动态场景混淆去除是实现基于动态场景图像识别的运动目标检测的关键。针对传统方法中模糊混淆点配准不精,去混性能不好的问题,提出一种采用加速鲁棒特征匹配的模糊动态场景混淆去除算法,设计图像序列块曝光生成模型和边缘检测算法,抑制运动场景混淆图像边缘凹点灰度特征和混淆干扰,设计并行处理的分块检测方案提高处理速度,采用加速鲁棒特征匹配方法实现混淆去除。实验结果表明,采用该算法进行模糊动态场景图像的混淆去除处理,特征匹配精度高,去除混淆效果较好,在色彩自然效果保持和实时性方面优越传统方法,在基于图像处理的快速运动目标识别和动态场景恢复等领域具有很好的应用前景。 相似文献
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静态视点图像由于起点坐标和视线方向出现视觉偏移,在三维视景仿真中图像平滑过渡效果不好。传统方法中采用基于光线Ray光线程基元算法,光亮度产生像素色差干扰,视景仿真效果欠佳,提出一种基于归一化线性滤波的改进的Ray光线程基元算法,通过图像的每个像素沿着固定的方向虚拟构建一条发射光线,获取Ray光线程基元,采用归一化线性滤波处理,优化光线强度的衰减,修正起点坐标和视线方向出现的视觉偏移,实现静态视点的平滑过渡,仿真实验得到位置静态视点、角度静态视点和相对距离静态视点模型下的大型运动舰船视景仿真结果,仿真表明,采用该算法对静态视点的复杂图像进行三维视景仿真,能在操作进程和虚拟数据资源配置中实现并行处理,静态视点的纹理的寻址和遍历均匀,实现了平滑过渡,有较高的配准率,视景仿真效果真实可靠。 相似文献
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针对传统视频图像解码算法进行解码运算时,存在解码后视频图像失真率高、解码效率低的问题,提出基于边缘提取的会议视频图像快速解码算法.该算法采用边缘提取方法预处理会议视频图像,以获得会议视频图像的边缘掩膜,根据边缘掩膜对会议视频图像进行平滑处理.通过自适应抽帧方法增大视频图像中的序列场景,抽取未发生跳变的图像帧数.采用双向运动补偿插帧方法填充运动矢量,完成会议视频图像的快速解码.实验结果表明,所提出的基于边缘提取的会议视频图像快速解码算法,边缘提取误差低、解码失真率低、解码效率高,具有较高的实际应用价值. 相似文献
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对基于边缘的算法进行了改进,综合考虑了边缘和能量结构. 首先利用非下采样contourlet(NSCT)变换,对图像进行多尺度和多方向的分解;然后将低频系数按边缘能量大小划分为边缘和平滑2部分,边缘部分采用边缘能量取最大的融合方法,平滑部分使用基于局部能量的规则进行融合,高频子带使用相关系数和局部方差相结合的重要性测度法进行融合;最后对融合系数进行NSCT反变换得到融合图像. 实验结果表明,该算法融合效果较基于边缘算法有所改善,是一种有效兼顾细节和能量结构的方法. 相似文献
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研究医学DR图像增强问题,由于DR图像在拍摄过程中,受噪声的干扰,曝光量不当,人体组织太厚等原因,细节信息会被噪声等不利因素埋没,边缘变得不清晰,对比度降低,容易导致病变区域的误诊。为了给医生提供更加清晰的DR图像方便诊断,提出一种基于混合优化算法的医学DR图像增强方法,首先采用基于人工鱼群算法和细胞膜优化算法的混合优化算法对DR图像进行分解,然后对分解后的关注区的高频区做非线性增强,对关注区的低频区做Piecewise直方图均衡化增强,对非关注区做分段线性增强。仿真实验表明这种方法有效地消除了DR图像中噪声,增强后DR图像细节信息更加清楚,具有高的重复性、稳定性和鲁棒性。 相似文献
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提出了一种基于光场渲染的动态3D目标重构的方法.目前基于图像建模的方法对于复杂场景难以建模,而基于图像渲染的方法因数据量大不利于动态场景的实时渲染.因此采用了模型和图像相结合的方法,从多视点视频图像中重建动态3D模型,采用光场映射算法对重建的3D模型进行光场采样,然后对样本分解压缩.实验结果表明,在保证真实感的同时,减少了数据量,并可实现动态3D目标的重构. 相似文献
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在三维模型视景仿真建模中,常因视觉切换和光线强度衰减,产生轮廓块间混淆,需要进行混淆分离算法设计。提出一种基于二阶累积泰勒展开的三维模型轮廓块间混淆分离方法,进行高精度多轮廓三维立体模型视景建模,对于遍历后的建模点进行模型重构,实现三维多轮廓立体模型建模。构建多轮廓三维模型视景建模视点切换运动方程,得到边缘轮廓特征检测结果。提取轮廓块间的混淆像素值二阶累积量特征,采用二阶累积量泰勒展开算法,对三维图像模型的轮廓边缘块间混淆进行分离的改进。仿真结果表明,采用该算法,混淆分离效果较好,三维图像模型的视景仿真效果真实度较高,轮廓信息保真度好,展示了算法的优越性能。 相似文献
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对模糊图像的多尺度分割,是解决许多计算机视觉处理问题的基础。传统的图像分割算法采用基于小波变换的局部特征匹配方法,无法有效去除光照的干扰,对运动目标图像的分割效果不好。提出一种基于模糊图像边缘能量特征提取的运动目标图像的去光照干扰分割方法。计算去光照干扰后的运动目标图像振幅分量和频率分量,采用混合函数控制曲线方法生成运动目标图像时间序列,计算每个尺度下计算运动目标图像的边缘能量特征,进行图像区域特征的非同态块匹配分割,最终生成灰度直方图二进制均衡系数,实现了运动目标图像的准确分割,去除了光照干扰。仿真结果表明,该算法具有分割结果准确,抗干扰能力较好,图像分割质量较优。 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
13.
《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
14.
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