The first step to finding the edges by Canny's algorithm will need to eliminate the interference (Noise). How to use filters, Gao Xian framework (Mask) framework, the size of the filter, if it is a very large Asian scratching will result in lower noise. If there are too many kropkwang in size results in a smaller edge details are missing or may have edge that does not match the picture. The result of the image through image, smooth with a filter, Gao Xian is available from.
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