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单幅室外图像的高阶能量方程阴影检测算法 被引量:2
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作者 陈卓 刘艳丽 杨红雨 《计算机辅助设计与图形学学报》 EI CSCD 北大核心 2019年第7期1102-1109,共8页
单幅室外图像的阴影检测是数字图像处理领域的研究热点之一.针对单幅室外图像的阴影检测算法往往只关注阴影的边缘或区域信息,忽视了两者之间的依存关系,即“阴影区域-阴影边缘-非阴影区域”的阴影布局信息的问题,提出阴影检测算法.首... 单幅室外图像的阴影检测是数字图像处理领域的研究热点之一.针对单幅室外图像的阴影检测算法往往只关注阴影的边缘或区域信息,忽视了两者之间的依存关系,即“阴影区域-阴影边缘-非阴影区域”的阴影布局信息的问题,提出阴影检测算法.首先将图像分割成独立区域;然后利用支持向量机构建高阶能量方程,对阴影布局信息进行建模;最后通过最小化方程来判断区域是否为阴影.文中不但严谨证明了高阶能量方程在局部最优点下的性质,而且指出了其最优的降阶方法.在公开图像数据库上的实验表明,该算法能够有效地检测单幅室外图像中的阴影区域. 展开更多
关键词 阴影检测 高阶能量方程 单幅室外图像
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Energy-Work Connection Integration Scheme for Nonholonomic Hamiltonian Systems
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作者 WANG Xian-Jun FU Jing-Li 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第11期1041-1046,共6页
This paper focuses on studying a new energy-work relationship numericM integration scheme of nonholonomic Hamiltonian systems. The signal-stage numerical, multi-stage and parallel composition numerical integration sch... This paper focuses on studying a new energy-work relationship numericM integration scheme of nonholonomic Hamiltonian systems. The signal-stage numerical, multi-stage and parallel composition numerical integration schemes are presented. The high-order energy-work relation scheme of the system is constructed by a parallel connection of n multi-stage schemes of order 2, its order of accuracy is 2n. The connection, which is discrete analogue of usual case, between the change of energy and work of nonholonomic constraint forces is obtained for nonholonomie Hamiltonian systems. This paper also gives that there is smaller error of the scheme when taking a large number of stages than a less one. Finally, an applied example is discussed to illustrate these results. 展开更多
关键词 numerical integration differential equation high-order scheme energy-work relationship nonholonomic Hamiltonian system
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