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距离图的点荫度 被引量:3
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作者 左连翠 李霞 《山东大学学报(理学版)》 CAS CSCD 北大核心 2004年第2期12-15,共4页
实数距离图G(R ,D)是顶点集为实数轴上的所有点 ,顶点u ,v∈R相邻当且仅当 |u -v|∈D ,其中D是一个正实数集 .讨论了当D为 1到δ的区间时 ,实数距离图G(R ,D)的点荫度 .特别地 ,当D是某正整数集合 ,Z是整数集时 ,得出了整数距离图G(Z ,D... 实数距离图G(R ,D)是顶点集为实数轴上的所有点 ,顶点u ,v∈R相邻当且仅当 |u -v|∈D ,其中D是一个正实数集 .讨论了当D为 1到δ的区间时 ,实数距离图G(R ,D)的点荫度 .特别地 ,当D是某正整数集合 ,Z是整数集时 ,得出了整数距离图G(Z ,D)的点荫度的几个上界 . 展开更多
关键词 距离图 点阴度 树着色
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VEHICLE SEGMENTATION AND SHADOW HANDLER BASED ON EXTREMUM IMAGE 被引量:3
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作者 温惠英 徐建闽 刘利频 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2006年第1期65-71,共7页
The shadows similar to the vehicle and the spots caused by vehicle lamps need to be accurately detected in the vehicle segmentation involved in the video-based traffic parameter measurement. Generally, the road surfac... The shadows similar to the vehicle and the spots caused by vehicle lamps need to be accurately detected in the vehicle segmentation involved in the video-based traffic parameter measurement. Generally, the road surface is different from the vehicle surface in the gray-level architecture. An invariant gray-level architecture-the extremum image in the changing illumination environment is derived and a novel algorithm is presented for detecting shadows and spots. The gray-level structure that is not sensitive to the illumination is employed in the algorithm and the road surface mistaken as vehicles can be removed. 展开更多
关键词 gray-level structure extremun point image extremum polarity image shadow detecting VEHICLE
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