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1.
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
2.
传统的SURF方法对动画图像角度特征匹配准确度较低,计算开销大,稳健性不好。引入Hes.sian矩阵尺度极值检测技术,提出一种改进的基于加速鲁棒特征匹配算法,实现对动画图像的角度特征优化匹配。首先基于摄像机的成像原理利用灰度直方图二进制均衡算法对图像进行增强处理,采用Hessian矩阵检测出图像每个尺度中的极值点,把图像角度极值点聚焦在图像的仿射闭合区域。提取仿射闭合区域的图像角度特征,使用SURF双向匹配算法实现角度特征优化匹配。仿真实验表明,改进方法能使图像的角度特征匹配准确度大幅提升,特征匹配准确率提高显著,有较好的鲁棒性和实时性。 相似文献
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人体运动图像动态视点平滑能量衰减过程仿真 总被引：1，自引：0，他引：1
传统图像平滑能量衰减分析方法,对于人体运动图像高频分量抑制效果较差,且模糊图像边缘,运算效率较低。提出了一种依据替身运动DR算法的人体运动图像动态视点平滑能量衰减过程仿真方法,采用高斯滤波器对人体运动图像进行平滑处理,过滤人体运动图像的噪声,完整保留人体运动图像边缘信息以及细节,用替身描述人体在场景中的运动特征,替身在场景中运动并同其它人体的替身进行交互,采用局部化的人体模型提高人体运动场景的逼真度,通过人体运动图像的DR预测算法,完成人体运动图像动态视点平滑能量衰减过程分析。实验结果说明,所提方法能够确保人体运动图像边缘锐化,有效降低平滑能量、锐化边缘。 相似文献
4.
提出一种基于伪信息去除的多层曝光图像序列轮廓波域平滑算法,首先设计图像序列块曝光生成和轮廓边缘检测算法,基于非局部均值滤波进行图像特征提取,对图像进行连续性小波变换,得到图像的伪信息中心矩特征,求得多层曝光图像的最大后验估计算子,最终生成灰度直方图二进制均衡系数,进行特征匹配后得到了去除伪信息的输出图像,实现对轮廓波域平滑算法改进。仿真实验表明,采用该算法得到图像轮廓波域平滑处理后的PSNR最高,保留了图像大部分的细节信息,展示了较好的伪信息去除性能,图像纹理清晰可见,图像的视觉效果更好,实现准确的轮廓波域平滑处理。 相似文献
5.
传统算法对空中模糊目标图像边缘特征的提取不理想,图像融合检测和边缘恢复效果不佳。提出空中模糊目标图像边缘信息的融合与恢复方法,在多尺度Markov随机场框架下,基于最大似然准则,引入信息度量因子,对空中模糊目标图像边缘信息融合规则进行优化指导,采用势函数逆变换的方法,得到重构的空中模糊目标融合图像。仿真实验中,相比于传统算法,改进算法图像边缘信息恢复准确度提高了63%,在细节信息包含量和实时性处理方面都有较强优势,在伪装模糊目标识别和目标精确检测等领域具有较好的应用价值。 相似文献
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在对高速运动目标的多媒体视频采集中,因为风力、高速抖动等原因导致视频和图像采集模糊,稳定性差,需要进行对视频和图像等多媒体素材进行电子稳像处理,提高对图像目标的识别和检测能力。传统方法中采用块匹配方法构建电子稳像算法,因为运动帧补偿效果不好,稳像效果较差。提出一种基于运动帧补偿的多媒体块匹配电子稳像算法,进行GSM随机场建模和进行像素点关联传递迭代优化,将图像的前一帧作为参考帧对当前帧进行参数补偿,求得的全部帧图像对应的运动参数,实现对电子稳像算法改进。仿真实验表明,算法能保留图像中的特征的同时去除图像中含有的抖动,稳像处理性能较传统方法优越。改进方法在电子侦察、远程目标识别等领域具有优越的应用前景。 相似文献
8.
《科技通报》2016,(8)
图像在过度曝光采集的情况下会因为光圈的进光量过大导致图像的细节关键信息缺失,研究过度曝光图像的缺失信息修复算法,为图像的细节特征分析奠定基础。传统方法采用图像小波尺度分解方法进行图像缺失信息修复,随着光圈的增大,对细节信息的修复效果不好,提出一种基于改进的小波包分解的过度曝光图像缺失信息修复算法。构建了过度曝光图像的纹理信息特征传导模型,采用Harris角点检测算法实现对过度曝光图像的灰度特征匹配,采用小波包分解方法对图像缺失信息进行位置和尺度信息的重构,实现缺失信息修复。仿真结果表明,采用该算法进行过度曝光图像修复,图像的细节特征得到准确有效复原,提高图像的识别能力。 相似文献
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《科技通报》2015,(12)
CCD固态图像传感器用于遥感图像采集中,遥感对地探测中进行图像采集的轮廓线特征模糊,需要进行自适应轮廓线跟踪标记,提高图像的分析和识别能力。传统方法采用尺寸配准标定技术,对边缘模糊的遥感CCD成像标记效果不好,出现伪轮廓。提出一种基于Harris角点检测的遥感对地CCD成像自适应轮廓线跟踪标记算法。进行遥感对地CCD成像图像数据模型构建,设计Harris角点检测算法进行CCD遥感成像的边缘轮廓像点拟合,进行边缘轮廓线的亮点分析,提高采样精度,通过遥感成像的运动幅度检测实现对轮廓线跟踪标记。仿真结果表明,算法能有效实现CCD成像轮廓线跟踪标记高精度拟合,能有效剔除边缘干扰,提高对地遥感观测图像的探测精度。 相似文献
11.
A research group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol-a chemical found in the skins of red grapes in red wine-can improve the sensitivity of mice to the hormone insulin according to a report in the October issue of Cell Metabolism.…… 《中国科学院院刊(英文版)》2008,22(1):14-15
Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said. 相似文献
12.
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.
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
15.
《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
16.
Active biological molecules functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery disease diagnosis therapy new nanodevice construction.…… 《中国科学院院刊(英文版)》2008,22(1):22-22
Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction. 相似文献
17.
《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
18.
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
19.
Leah A. Lievrouw 《The Information Society》2000,16(2):155-159
This essay focuses on universal service and the Internet as means to support social and political participation. The emphasis on access to telecommunications systems in conventional approaches to universal service is contrasted with access to content. A model of the information environment is described that accounts for the roles of content and conduit, both of which are necessary conditions to achieve true access. A method is outlined for employing information indicators to observe or measure the information environment. 相似文献
20.
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