文件名称:extractcurve
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根据8连通准则，顺着轮廓的走向将轮廓上的像素位置依次存储，每一个轮廓存储为一个单独的结构中-According to the guidelines communicated 8, along the contour toward the pixel positions on the contour is stored sequentially, each contour is stored as a separate structure
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extract_curve.m