期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
被动分簇策略在定向扩散路由算法中的应用
1
作者 杜胜永 郭强 《计算机应用》 CSCD 北大核心 2008年第2期402-405,共4页
定向扩散算法是针对传感器网络提出的以数据为中心的按需路由算法,提出将被动分簇策略与定向扩散算法相结合的分簇方案,同时引入三色算法解决被动分簇策略所建簇结构不合理的问题。本方案将分簇信息附加在兴趣数据包中,在兴趣扩散的过程... 定向扩散算法是针对传感器网络提出的以数据为中心的按需路由算法,提出将被动分簇策略与定向扩散算法相结合的分簇方案,同时引入三色算法解决被动分簇策略所建簇结构不合理的问题。本方案将分簇信息附加在兴趣数据包中,在兴趣扩散的过程中,按照三色算法建立网络的逻辑簇结构。分簇结构有效降低了原路由算法兴趣扩散过程的通信开销,且避免了主动分簇所带来的开销。仿真实验验证了算法的有效性。 展开更多
关键词 定向扩散 被动分簇 三色算法
下载PDF
An improved Vibe algorithm for illumination mutations 被引量:2
2
作者 LIANG Jincheng WANG Xiaopeng WANG Qingsheng 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2022年第2期184-191,共8页
The visual background extractor(Vibe)algorithm can lead to a large area of false detection in the extracted foreground target when the illumination is mutated.An improved Vibe method based on the YCbCr color space and... The visual background extractor(Vibe)algorithm can lead to a large area of false detection in the extracted foreground target when the illumination is mutated.An improved Vibe method based on the YCbCr color space and improved three-frame difference is proposed in this paper.The algorithm detects the illumination mutation frames accurately based on the difference between the luminance components of two frames adjacent to a video frame.If there exists a foreground moving target in the previous frame of the mutated frame,three-frame difference method is utilized;otherwise,Vibe method using current frame is used to initialize background.Improved three-frame differential method based on the difference in brightness between two frames of the video changes the size of the threshold adaptively to reduce the interference of noise on the foreground extraction.Experiment results show that the improved Vibe algorithm can not only suppress the“ghost”phenomenon effectively but also improve the accuracy and completeness of target detection,as well as reduce error rate of detection when the illumination is mutated. 展开更多
关键词 moving target detection visual background extractor(Vibe)algorithm YCbCr color space three-frame difference method
下载PDF
GENETIC ALGORITHM IN REDUCTION OF NUMERICAL DISPERSION OF 3-D ADI-FDTD METHOD
3
作者 Zhang Yan Lü Shanwei Gao Wenjun 《Journal of Electronics(China)》 2007年第3期380-383,共4页
A new method to reduce the numerical dispersion of the three-dimensional Alternating Di-rection Implicit Finite-Difference Time-Domain (3-D ADI-FDTD) method is proposed. Firstly,the numerical formulations of the 3-D A... A new method to reduce the numerical dispersion of the three-dimensional Alternating Di-rection Implicit Finite-Difference Time-Domain (3-D ADI-FDTD) method is proposed. Firstly,the numerical formulations of the 3-D ADI-FDTD method are modified with the artificial anisotropy,and the new numerical dispersion relation is derived. Secondly,the relative permittivity tensor of the artificial anisotropy can be obtained by the Adaptive Genetic Algorithm (AGA). In order to demon-strate the accuracy and efficiency of this new method,a monopole antenna is simulated as an exam-ple. And the numerical results and the computational requirements of the proposed method are com-pared with those of the conventional ADI-FDTD method and the measured data. In addition the re-duction of the numerical dispersion is investigated as the objective function of the AGA. It is found that this new method is accurate and efficient by choosing proper objective function. 展开更多
关键词 Finite-Difference Time-Domain (FDTD) Alternating-Direction Implicit (ADI) Numerical dispersion Artificial anisotropy Genetic Algorithm (GA)
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部