中文说明：先对图片进行灰度处理，然后进行高斯滤波，最后得到边缘特征点。
English Description：
Firstly, the gray level of the image is processed, and then the Gaussian filter is used to get the edge feature points.
Gaussian filtering to edge feature points
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中文说明：先对图片进行灰度处理，然后进行高斯滤波，最后得到边缘特征点。
English Description：
Firstly, the gray level of the image is processed, and then the Gaussian filter is used to get the edge feature points.