中文说明：对图形进行边缘检测并输出边缘点和该点所在处的灰度变化率。
English Description：
The edge of the image is detected and the edge point and the gray change rate of the point are output.
The edge of the image is detected and the edge point and the gray change rate of the point are outpu
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中文说明：对图形进行边缘检测并输出边缘点和该点所在处的灰度变化率。
English Description：
The edge of the image is detected and the edge point and the gray change rate of the point are output.