生物视觉同时对比机制在高通滤波中的应用

MECHANISM OF SIMULTANEOUS CONTRAST IN BIOLOGICAL VISION FOR HIGH-PASS FILTERING

本文首先比较了生物视觉同时对比现象与各向异性高通滤波之间的相似性,再对各向异性高通滤波器方向与边缘方向之间的夹角和滤波效果之间关系进行了研究,从而提出了一种基于角度搜索的各向异性高通滤波方案,并从实现方式和滤波效果实验等两个方面将该方案与采用灰度梯度方向估计的滤波方案进行了比较。实验表明,采用灰度梯度方向估计的边缘方向与实际边缘方向尚存在较大的差距,这将直接导致高通滤波效果的下降;而新的滤波方案却能大大地改善高通滤波效果。根据角度搜索时所设定的搜索精度大小,该滤波方案将具有不同的工程应用价值。

Based on the comparison between the mechanism of the simultaneous contrast in biological vision and the anisotropie high-pass filtering and the analysis of the relation between the filtering performance and the angle of the edges and the orientation of the filter＇s long axes,an anisotropic high-pass filtering scheme on the basis of angle searching is proposed in this paper. Then we compare the new scheme with that of the gray gradient orientation from the aspects of the schemes＇ realization and the filtering performance. The experimental result shows that, the edge＇s orientation obtained with the method of gray gradient orientation is quite different from the real edge＇s orientation which leads to deterioration of the high-pass filtering performance, but the new scheme can greatly improve it. Different engineering application value is obtained depending on the different sampling precision in angle searching.