作　　者： ; ; ;

机构地区： 华中科技大学电子与信息工程系

出　　处： 《中国图象图形学报》 2008年第6期1077-1081,共5页

摘　　要： 由于采用梯度估计法得到的边缘方向往往与实际边缘方向有较大的差距,从而导致高通滤波的效果降低,为了提高高通滤波效果,在研究了滤波器长轴和边缘方向的夹角对滤波效果的影响曲线的基础上,结合坐标变换,提出了一种改进型的边缘方向角估计算法。由于该算法尽可能多地利用了区域中像素点的灰度值参与估计,并选择了1个最优化的方向角估计值,因此估计的边缘方向更贴近实际边缘。实验中,以严格遵循"滤波器长轴与实际边缘方向重合"时得到的滤波效果和实验数据作为理想高通滤波的基准,实验结果表明,采用这种改进型边缘估计算法所得到的滤波效果和实验数据更趋近于理想高通滤波的基准。 The edge＇ s orientation obtained with the method of the gray gradient orientation is quite different from the real edge＇s orientation. Therefore, it causes the deterioration of the high-pass filtering performance, if we place the filter according to the estimated angle obtained with the gray gradient orientation. The influences of the angle of edge＇ s orientation and filter＇ s long axis on the filtering performance have been studied in this paper. Based on the analysis of the curve and combined with a coordinate transformation, an improved algorithm on the method of the gray gradient orientation is proposed. Because of the algorithm making full use of the pixels in the region for a better estimation, then the optimized estimated angle is selected, which is closer to that of the real edge＇s orientation. If the orientation of the filter＇s long axis is strictly consistent with that of the real edges , the filtering performance and its material experimental data are regarded as a performance criterion. The experimental result shows that using the algorithm , both the filtering performance and its material experimental data are close better to the performance criterion mentioned above.

关 键 词： 坐标变换 边缘方向估计 各向异性高通滤波

领　　域： [自动化与计算机技术] [自动化与计算机技术]