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求出图像在水平方向和垂直放向的梯度,然后做差。用sobel算子可以么
有能直接调用的函数么
https://book.openmv.cc/example/04-Image-Filters/edge-detection.html
例子里是边缘检测。
水平梯度的值 - 垂直梯度的值,没意义啊