共查询到20条相似文献，搜索用时 62 毫秒
1.
针对CCD型医学图像中,在细胞粘连区域信号附近出现的较强的横条纹噪声干扰,影响图像信息的正确性,分割后会存在边界模糊和锯齿条文的问题,为提高医学图像分割效果,提出了一种基于横条纹噪声消除的医学粘连图像边缘分割算法。分析了医学图像中边沿横条纹噪声的原因,通过wold纹理模型与多尺度马尔可夫随机场模型,利用确定性随机场和不确定性随机场的谱属性不同的特征,将医学图像边沿的干扰特征分离开,有利于对粘连医学图像进行分割。实验证明,方法有效地去除了横条纹噪声并很好地保留了图像的边缘和细节信息,同时运算复杂度低。 相似文献
2.
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
3.
《科技通报》2017,(1)
传统的煤炭资源远程网络监控系统容易受波动系数的干扰,不能准确分析煤炭资源在地下的区域分布状态。提出基于三维虚拟现实技术的煤炭分布式远程网络监控系统,通过计算机图形学和计算机语言,实现煤矿分布三维虚拟现实系统,通过网络分析、控制、监控终端等模型监控和管理煤炭资源三维图像数据,采用改进TIN模型的三维地图建模方法,获取煤炭资源三维地图的建模结果,完成煤炭资源三维区域准确测量,采用立体投影技术在大屏幕上呈现出煤炭的分布情况。实验结果表明,该系统能够准确获取煤炭资源分布区域,并且相比传统系统具有较高的抗干扰性和精确度,获取的图像清晰、效果逼真,对煤炭开采具有重要的指导作用。 相似文献
4.
传统的森林图像火灾监控方法中,无法消除由于强光照射带来的影响,传感器采集图片像素冗余发生混淆,可识别的特征关联性下降.提出一种加入强光照射因子的识别模型,通过准确计算森林遥感图像中,可能产生反射的区域,对其区域可能产生的反射光建立模型,运用加入光模型的图像分割方法,对可能产生火灾的区域进行分割识别.实验证明,这种算法能够提高远程森林火灾检测的精度. 相似文献
5.
《科技通报》2016,(7)
针对HIFU超声图像中目标的自动识别和分割进行了研究。提出了一种结合了动态阈值分割和K-最近邻(KNN)纹理分类方法的全自动图像分割方法。首先对图像进行预处理,减小噪声干扰。然后进行动态阈值分割,得到包括目标轮廓在内的很多轮廓。同时利用KNN纹理分类方法对预处理后的图像进行分类,其中用到的纹理特征通过灰度共生矩阵计算得到。接着将动态阈值分割结果与KNN分类结果做一个与运算,与运算以后的结果通过形态学操作和区域滤波就得到准确的目标区域轮廓。从对HIFU超声图像的分割结果和对该方法的评价结果来看,该全自动图像分割方法是可行并且有效的,有可能进一步将其投入实际应用中去。 相似文献
6.
7.
8.
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
9.
为了解决传统分水岭的过分割问题,提高图像分割的准确性,本文提出一种多尺度形态学标记的分水岭算法。首先利用H-minima变换对中值滤波后的梯度图像进行初始标记;然后利用不同尺寸的结构元素分别进行梯度图像闭重构,对闭重构后的各梯度图像与梯度图像求差,得到标记图像,将各尺度下的区域标记点求并集,并作为新的标记图像,获得最终的标记;最后对修改后的梯度图像进行分水岭分割。实验结果表明,该方法能有效的解决过分割问题,边界定位准确。 相似文献
10.
《科技通报》2015,(12)
遥感图像中存在大量微小红外目标,对其准确的分类和定位识别是实现远程目标识别和遥感测量的基础。目前对该类红外小目标的识别方法采用单层正方形网格生成方法,对随机标定的红外目标点的识别效果不好。提出一种基于Harris角点检测的遥感图像中微小红外目标的分类定位识别算法。构建遥感图像的红外目标数据采集模型,对图像进行角点特征提取预处理,采用Harris角点检测算法实现对红外目标微小特征点的信息标定,实现对其准确分类定位。仿真实验表明,采用该算法进行微小红外目标的分类定位识别,具有较高的准确性,对红外目标的特征提取和定位识别效果较好,在远程目标探测和遥感监测等领域具有较高的应用价值。 相似文献
11.
《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
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.
《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
15.
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
16.
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
17.
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
18.
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
19.
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
20.
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