Traditional Edge Detection Methods 传统边缘检测方法
According to matching results, the matching recognition ratio of edge character images based on different edge detection methods is different.
从匹配的结果看来，基于不同边缘检测方法得到的边缘特征图像，匹配的识别率是不同的。
Because of the low resolution and few gray-level for B-ultrasonic images, we can hardly obtain satisfied result by the traditional edge detection methods.
由于B超图像的分辨率差、灰度级别少等特点，用传统的边缘检测方法难以得到满意的效果。
In industrial vision inspection, many edges of inspecting objects are. some kinds of roof edges, but current sub-pixel edge detection methods are only applied to step edges.
在视觉检测中，许多待检目标边缘都是屋脊型边缘，而现有亚像素边缘检测方法往往只研究阶跃边缘的检测，对屋脊边缘的研究较少。
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