A variational method for contour tracking via covariance matching

This paper presents a novel formulation for contour tracking.We model the second-order statistics of image regions and perform covariance matching under the variational level set framework.Specifically,covariance matrix is adopted as a visual object representation for partial differential equation(PDE) based contour tracking.Log-Euclidean calculus is used as a covariance distance metric instead of Euclidean distance which is unsuitable for measuring the similarities between covariance matrices,because the matrices typically lie on a non-Euclidean manifold.A novel image energy functional is formulated by minimizing the distance metric between the candidate object region and a given template,and maximizing the one between the background region and the template.The corresponding gradient flow is then derived according to a variational approach,enabling partial differential equations(PDEs) based contour tracking.Experiments on several challenging sequences prove the validity of the proposed method.     

Binary particle swarm optimization with multiple evolutionary strategies

This paper introduces a novel variation of binary particle swarm optimization(BPSO) algorithm and a further extension to improve its performance.Firstly,mimicking the behaviors of some creatures group,multiple evolutionary strategies BPSO(MBPSO) is introduced which takes different evolutionary strategies for various particles according to their performances.Then,on the basis of MBPSO,a new strategy is discussed to improve the performance of the MBPSO(M2BPSO) which adopts the concept of the mutation operator aiming to overcome the premature convergence and slow convergent speed during the later stages of the optimization.The proposed two algorithms are tested on seven benchmark functions and their results are compared with those obtained by other methods.Experimental results show that our methods outperform the other algorithms.     

Localized relaxation theory of circuits and its applications in electro-thermal analyses

In the high-performance IC design with increasing design complexity,it is a very important design content to efficiently analyze IC parameters.Thus,the electro-thermal (ET) analyses including power/ground (P/G) analysis and thermal analysis are hot topics in today’s IC research.Since ET analysis equation has a sparse,positive definite and strictly diagonally dominant coefficient-matrix,we prove that the ET analysis has the advantage of locality.Owing to this advantage,localized relaxation method is formally proposed,which has the same accuracy as the global relaxation done with the constraint of the same truncation error limitation.Based on the localized relaxation theory,an efficient and practical localized successive over-relaxation algorithm (LSOR2) is introduced and applied to solve the following three ET analysis problems.(1) Single-node statistical voltage analysis for over-IR-drop nodes in P/G networks;(2) single-node statistical temperature analysis for hot spots in 3D thermal analysis;(3) fast single open-defect analysis for P/G networks.A large amount of experimental data demonstrates that compared with the global successive over-relaxation (SOR) algorithm,LSOR2 can speed up 1-2 orders of magnitudes with the same accuracy in ET analyses.     

云计算是小型企业唯一的出路

云计算模型对于传统的信息技术工作方式产生了巨大的改变。与以往两次重大的信息技术变革,即客户端/服务器应用模式以及互联网的出现一样,推动云计算前进的两个重要动力就是可接入性以及成本。更简单的讲,就是如何才能让计算架构、平台和应用程序能够被更广泛的应用,以及如何让这些应用更廉价。实际上,这两者是相辅相成的:只要更廉价的技术出现,就会有更多人去使用这种技术。这两个驱动力对于小型企业来说是尤其具有价值的。随着技术越来越廉价,云技术可以让更多的小型企业采纳IT解决方案,从最简单     

利用无线路由器建立FTP服务器

无线路由器的应用非常广泛,无线路由器技术也更加完善和稳定,利用无线路由器能构建FTP服务器。下面,我就具体的方法在这里拿出来和大家分享一下,希望对大家用。一、FTPFTP(文件传输协议)诞生之后,便迅速地得到了推广和应用。FTP服务器的构建相对比较简单,在当今互联网迅速发展的形势下,无论     

构建基础架构云选Power还是x86？

选Power还是选x86？当云计算以不可逆转之势席卷IT产业,争论了十几年的话题再度被推向了高潮。 短短几年间,云计算已经从一个看上去很美的概念,快速的转化为实际应用,当前企业更加关注的,不是是否应该投入云,而是应当如何投入云,那么,如何选择云计算基础架构也就成为不可避免的一个话题。     

中小企业未来信息化解决之道

"企业信息化"在中国早已不是一个新鲜概念,从十几年前提出到现在",企业信息化"得到了快速发展。然而时至今日,中国中小企业的信息化进程仍然无法让人乐观,它正在遭遇一个发展"疲惫期"。     

十大卖点解析：HTC One X更适合高端人群

HTCOneX是HTC开始走精品路线后推出的首款高端智能手机,这款手机不仅拥有强劲的硬件配置。也更加注重功能体验方面的改进,如卓越的拍照功能、出色的音效、易用的人机交互功能等。这样出色的产品,拥有的强大竞争力使其在市场上备受欢迎．而其高端的软硬件配置更加适合高端人群。     

人人皆语音控，手机浏览器语音功能比拼

估计每个iphone4S用户的一大优越感就是可以调戏Siri．但是现在广大的Android用户也有机会了!除了语音输入法等语音应用以外。国内多家手机浏览器公司也都推出了各自的支持语音的手机浏览器产品。作为手机上的重要应用之一．手机浏览器当然也要玩语音!     

基于滤波的SAR影像去噪方法分析

根据SAR(Synthetic Aperture Radar)影像相干噪声的特点,对现在广泛应用的各种抑制噪声的滤波方法如均值滤波、Frost滤波、增强型Lee滤波、Lee滤波、中值滤波等进行分析,并提出适合本研究区影像的基于小波变换的分量滤波处理去噪方法,利用均值、标准差、平滑指数、PM值、信息熵和平均梯度等评价指标对各种滤波去噪后的影像质量进行评价,并对去噪效果进行对比分析,证明本文所采用的滤波方法对SAR影像噪声有很好的抑制作用,并且较好的保存了图像纹理信息。