According to the pixel value of the image boundary, expand the image outwards, and expand 50 pixels in each direction.
a = cv2.copyMakeBorder(img,50,50,50,50,cv2.BORDER_REPLICATE)
Turn 50 pixels close to the boundary out (axisymmetric):
a = cv2.copyMakeBorder(img,50,50,50,50,cv2.BORDER_REFLECT)
a = cv2.copyMakeBorder(img,50,50,50,50, cv2.BORDER_CONSTANT,value=[0,255,0])
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