The foreground detection algorithm combined the temporal–spatial information and adaptive visual background extraction

Visual background extraction algorithm, which utilises a global threshold to complete the foreground segmentation, cannot adapt to illumination change well. It will easily choose the wrong pixels to initialise the background model, resulting in the emergence of the ghost in the beginning of detection. In order to address these problems, this article proposes an improved algorithm based on pixel’s temporal–spatial information to initialise the background model. First of all, the pixels in video image sequences and their neighbourhood pixels are used to complete background model initialisation in the first five frames. Second, the segmentation threshold is adaptively obtained by the complexity of background that uses the spatial neighbourhood pixels. Finally, the background model of the neighbourhood pixels is updated by a dynamic update rate which is gained by calculating the Euclidean distance between pixels. Experimental results and comparative study illustrate that the improved method can not only increase the accuracy of target detection by reducing the impact of illumination change effectively but also eliminate the ghost quickly.     

Direct numerical simulation of multiphase flow for arbitrary geometry using level contour reconstruction method

Direct numerical simulation of multiphase flow on fixed Eulerian grid became increasingly popular due to its simplicity and robustness. Some of the well-known methods include VOF, Level Set, Phase field, and Front Tracking method. Lately, hybridization of above methods gets its attention to overcome the disadvantages pertaining to each method. One hybrid approach developed by the author is the Level Contour Reconstruction Method (LCRM) which combines characteristics of both Front Tracking and Level Set method. Many engineering problems also contain complex geometry as boundary condition and proper representation of grid structure plays very important role for the successful outcomes. In this paper, an algorithm for handling arbitrary geometry inside fixed Eulerian computational domain with multiphase flow has been presented. Interface reconstruction between liquid and vapor phase has been performed outside of arbitrary solid boundary explicitly along with dynamic contact angle model. Sharp interface technique using ghost fluid point extrapolation method has been utilized for correct implementation of no-slip boundary condition at the wall. This paper was presented at the 7th JSME-KSME Thermal and Fluids Engineering Conference, Sapporo, Japan, October 2008. Seungwon Shin received his B.S. and M.S. degree in Mechanical Engineering from Seoul National University, Korea, in 1995 and 1998, respectively. He then received his Ph.D. degree from Georgia Tech in 2002. Dr. Shin is currently a Professor at the School of Mechanical and System Design Engineering at Hongik University in Seoul, Korea. Dr. Shin’s research interests include computational fluid dynamics, multiphase flow, surface tension effect, phase change process.     

Norton Ghost在无盘工作站网络的应用

NortonGhost软件是一个强大的系统应用工具,本文作者主要介绍的是使用Ghost在无盘工作站网络中来快速恢复工作站系统。     

戴维宁-诺顿定理的推广应用

广义等效电源定理是将常规的戴维宁和诺顿定理由单端口向多端口的推广,包括广义戴维宁、诺顿和戴维宁—诺顿定理三种形式。本文对三种端口应用形式进行了阐述,给出了广义等效电路求解模型。通过算例分析,对多端口含独立电源和受控源电路的求解方法进行研究和比较,验证了该算法的正确性。     

多功能电路模块设计

多功能电路模块是由印制电路板、电子元器件、信号源、仪器仪表等构建成的多网孔的电路,电路设计中各支路预留插孔,可根据课堂教学进程的需要调整信号源类型,构建成不同的电路类型,如单电源供电或者多电源供电的直流电路、交流电路;各支路可串接电流表,电阻两端可并联接入电压表,用以检测各支路元件的电路参数。多功能教学电路具有信号源的可外接性、电路结构的可调整性,可以灵活地运用到高职高专院校机械类、电子类、汽车类的《电路基础》课程的教学过程中,从而在不同的教学阶段可以构建不同的项目进行教学,围绕特定的项目,可以开展融"教、学、做"于一体的"理实一体化"教学模式。     

System Four操作系统和应用软件的备份与恢复

目前所有大型地震勘探仪器都是一个复杂的微计算机系统.在实际生产中,微计算机经常被病毒感染,严重影响野外生产.一键还原软件可对计算机系统盘完全备份,并将备份文件存于隐藏分区,从而有效保护数据.本文基于System Four仪器操作系统,详细阐述了在仪器主机系统的PC机上制作Ghost启动盘和备份数据的方法.     

网络克隆技术在机房管理中的应用

本文介绍了Ghost软件的网络克隆功能，Ghost软件的网络启动盘制作方法以及网络克隆的工作思路。     

Ghost(克隆)技术在计算机监控系统中的运用

针对计算机监控系统在维护方面存在的困难和某些问题,介绍了Ghost(克隆)技术的使用方法和Ghost(克隆)技术在计算机监控系统中的简单运用。     

Ghost的命令行参数及其应用

运用Ghost的命令行参数，可以简化操作过程。本文对各种命令行参数的使用作了一番简要的介绍，并以实例加以说明。