Lastly, some correlative problems in the research of edge detection algorithm are analyzed and illuminated, such as threshold selection, illegible edge legible, bead characteristic pick-up etc.

• 本文最后还对边缘检测算法研究中遇到的相关问题进行了分析说明，如阈值选择，边缘模糊清晰化，水珠特征提取等。