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perform zero crossing using openCV

LoG = cv2.Laplacian(src, cv2.CV_16S)
minLoG = cv2.morphologyEx(LoG, cv2.MORPH_ERODE, np.ones((3,3)))
maxLoG = cv2.morphologyEx(LoG, cv2.MORPH_DILATE, np.ones((3,3)))
zeroCross = np.logical_or(np.logical_and(minLoG < 0,  LoG > 0), np.logical_and(maxLoG > 0, LoG < 0))
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