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为了提高人脸检测速度,本文提出了一种肤色分割预处理方法,以肤色区域为基础进行去噪声处理、提取边界,然后由边界的连通性和闭合性得到初始矩形边界,最后进行归并处理得到人脸区域,将其代替原来的整幅图像作为后面人脸检测算法的输入,以减小搜索区域,提高检测速度.实验证明,该方法用于人脸检测技术能有效改善检测性能. 相似文献
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伊力哈木·亚尔买买提 《科技通报》2013,(9)
针对传统蚁群算法在维吾尔文字图像分割时容易产生缺陷和干扰的缺点,提出了一种改进的蚁群算法。该算法首先利用区域蚁群通过聚类中心对图像进行初步搜索和分割;然后再引入边界蚁群通过不同的路径选择信息素和策略更新手法来对图像进行边界补偿搜索;最后利用两种蚁群分别采用不同的路径选择信息素和筻略更新,共同实现对维吾尔文字图像精确分割的目标。实验结果表明,该算法准确分割出维吾尔文字区域,提高了其识别精度。 相似文献
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为提高彩色图像分割精度,解决传统分水岭图像分割算法误分割率高等问题,本文提出了一种基于改进分水岭算法的彩色图像分割方法。建立了基于偏微分方程的去噪模型,既可以抑制噪声又可以有效地保护图像轮廓。结合数学形态学、图像信息熵、区域合并实现图像分割。在彩色图像RGB空间利用信息熵求取形态学梯度,然后对彩色梯度图进行分水岭分割,最后进行区域合并。仿真结果表明:本文所述分割方法准确度和清晰度较好,噪声抑制效果理想而且分割速度较快。 相似文献
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研究图像冶金腐蚀区域准确分割的方法。在冶金腐蚀区域分割的过程中,利用传统方法进行分割处理,由于腐蚀区域边缘不规则,造成无法准确获取腐蚀区域的缺陷,影响了冶金腐蚀区域分割的准确性。为此,提出了一种基于图像的冶金腐蚀区域分割算法。采集冶金图像,并对其进行初始化处理,去除图像中的噪声,提高图像质量。对图像像素进行增强处理,提高图像的对比度。利用线性分析方法,对图像中的冶金腐蚀区域进行分割处理。实验结果表明,利用这种算法进行冶金腐蚀区域分割,能够有效提高分割的准确率,取得了令人满意的效果。 相似文献
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肺实质提取是利用计算机辅助诊断系统研究肺部疾病的关键步骤。低剂量CT扫描在肺部疾病诊断研究中应用广泛,但传统的肺实质分割方法由于低剂量CT图像噪声影响难以获得精确的肺实质分割结果。基于小波变换提出一种针对低剂量CT图像的肺实质分割算法。该算法首先应用全局阈值去除体外干扰,利用小波变换良好的定位性能准确检测出图像边界;然后进行边界连接解决微弱边沿丢失问题;最后,根据肺部边缘闭合周长最长这一特征,从连接好的边缘中检测肺实质边缘,从而达到提取肺实质的目的。理论分析与计算机仿真实验结果表明,算法具有良好的抗噪能力,与传统肺实质提取方法Snake模型相比,其检测出的图像面积重合率平均提高约1%。 相似文献
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通过对机床故障点的缺陷自适应定位实现对机床故障的安全监测和故障诊断,保障机床的高效运转。传统方法中,对机床故障点的缺陷定位采用基于图像分割的主动红外故障检测方法,当主动热激励源分布不均时,对机床故障点的监测准确性不高。提出一种改进的基于自适应缺陷定位的机床故障点安全监测方法,采用图像信号处理和信息论分析的方法,研究机床故障点安全监测技术,设计基于图像分割的机床故障点损伤检测算法,将缺陷点图像分割成一系列的小区域的过程是伴随着每次将采集系统进行一周的旋转前进,每转动一定的角度后内机床缺陷点开始出现一次成像。实现对机床故障点的安全监测。仿真实验表明,该算法能准确实现对机床故障点的定位,机床故障点能有效通过三维图像显示,监测的实时性和精准性较高,展示了该算法的优越性。 相似文献
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在虚拟手术系统模型中,特别是脑外科手术中,由于背景图像色彩的非规则性和非均匀性,导致对脑部损伤区域的手术入刀切割点的定位不准,影响手术精度和效果。传统方法采用损伤区域差异特征信息提取方法实现入刀点定位,对脑部特征二维灰度图片缺陷边界的定位效果不佳。提出一种基于背景差分法的虚拟手术损伤区入刀点定位算法,构建了虚拟手术的总体结构模型,将背景图像和人体软组织目标图像划分为多个子块,基于直方图选择阈值对差分图像序列进行二值化,得到高斯虚拟人体器官解析模型。设计医学图像分割算法,采用背景差分技术确定手术器械与软组织发生碰撞的激励因子,快速获取碰撞点,实现对虚拟手术入刀点的准确定位。实验结果表明,采用该算法实现虚拟手术系统设计和图像重构,对手术过程中器官损伤区域切割入刀点定位准确,性能优越,视景效果较好,计算时间缩短,精度提高。 相似文献
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针对传统Sobel边缘检测算法因方向模板限制而出现边缘定位精度不高,以及对叠加噪声的图像边缘检测效果不佳的问题,提出了一种基于传统Sobel算子的改进算法。首先将水平和垂直两个方向模板增加至8个,提高边缘的定位精度;然后利用边缘的最大后验概率估计,对采用八方向Sobel算法检测出的梯度图像进行最佳阈值分割处理,增强算法的抗噪声能力。实验结果表明,改进算法提取的边缘信息完整准确,对噪声干扰有较强的抑制能力。 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
12.
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
16.
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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《中国科学院院刊(英文版)》2014,(3)
<正>In Xishuangbanna,one of China’s most biodiverse regions,landscape has changed dramatically during the past three decades due to the conversion of tropical rainforest to rubber plantations.In steep areas,terraces are often constructed before planting rubber trees,which causes two important changes in the soil:the destabilization of soil in the bench terraces and the increased vulnerability of unvegetated riser faces to erosion.Few studies have documented the nature and intensity of erosion on bench terraces.Prof.LIU Wenjie and his colleagues from the Xishuangbanna Tropical Botanical Garden(XTBG)conducted a study in Menglun County(21°5′39″N,101°15′55″E),Xishuangbanna to evaluate the influence 相似文献
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Chinese Scientists Use Earth Observation Technologies to Study and Protect Wild Camels 总被引：1，自引：0，他引：1
《中国科学院院刊(英文版)》2014,(3):267-268
<正>Chinese scientists plan to apply Earth Observation technologies to protect the critically endangered wild camels(Camelus ferus).With the help of remote sensing,satellite positioning,geographical information system and wireless sensors networks,they will be able to access the distribution and population of the wild camels and protect their habitats.The project will be carried out by the International Research Center for Wild Camel Conservation,which was jointly established earlier this year by the Institute of Remote Sensing and Digital Earth(RADI)of the Chinese 相似文献
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WANG Sijia 《中国科学院院刊(英文版)》2014,(2):192-194
<正>The Paul Gerson Unna Research Group on Dermatogenomics was founded in October 2012 at the Partner Institute for Computational Biology.The ultimate goal of the group is to understand the biology of skin and skin appendages. 相似文献