摘要
基于物体内蕴几何量,提出一种观察三维物体的最优视点选择方法.首先在三维物体表面均匀采样获取采样点,并计算物体形心,然后利用采样点到物体形心的距离来构造距离直方图,最后计算距离直方图的Shannon熵并将其作为衡量视点优劣的标准.根据认知心理学理论,最优视点是存在的,也是恒定的,故文中视点在包围球上选取.实验结果表明,采用该方法获得的最优视点能观察到三维物体更多的功能结构和更显著特征,与其他方法相比更符合人类的感官选择.
Based on intrinsic geometric metric,a new method of selecting canonical viewpoints is proposed for observing 3D objects.First,a large quantity of points are sampled on the surface uniformly,and the centroid of 3D object is calculated.Second,a histogram is derived by the distances between sampling points and the centroid.Finally the Shannon entropy is computed and regarded as the measurement of the canonical viewpoint.According to recent research of cognitive psychology,the canonical viewpoint always exists as a fact and is stable.So the viewpoints can be positioned on the enclosed sphere of 3D object.The experimental results show that,by comparison with other methods,more functional structures and distinct features could be observed at the canonical viewpoint of this method,which share more common with the sensory choice of human beings.
出处
《计算机辅助设计与图形学学报》
EI
CSCD
北大核心
2010年第9期1515-1521,共7页
Journal of Computer-Aided Design & Computer Graphics
基金
国家"九七三"重点基础研究发展计划项目(2004CB318006)
国家自然科学基金重点项目(60533090)
国家自然科学基金(60873164)
