Canny edge detection，The purpose of edge detection is to significantly reduce the size of the image by preserving the original image attributes. There are a variety of algorithms for edge detection, although the Canny algorithm is old, but it can be said that it is a standard algorithm for edge detection, and is still widely used in research.

作业二：边缘提取（Canny）\cannyFindLocalMaxima.m
.........................\canny_edge.m
.........................\lena.bmp
.........................\log_edge.m
.........................\xinglong.jpg
.........................\程序运行说明.doc
作业二：边缘提取（Canny）

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