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I have a binary image [0,1]. I want to use Python to find the edge of the image. I have tried sobel method on the binary but it provides a bad result. I expect the output like the image enter image description here

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The best way is to apply a 1-pixel morphological erosion, then take the difference between the input image and the result. In pseudo-code:

edges = image - erosion(image)
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You saved my life. This is code edges = image - ndimage.morphology.binary_dilation(image)

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