Traditional Edge Detection Methods 传统边缘检测方法
Gradient based edge detection methods are mainly focus on step edges.
基于梯度的边缘检测算法，主要是针对阶跃形边缘的检测。
At the meantime it also do car plate locating by several edge detection methods.
同时也研究了一些边缘检测算法在车牌定位中的应用。
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。
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