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图像梯度感觉是用来提取出图像内部的轮廓：

import cv2import matplotlib.pyplot as pltimg = cv2.imread('logo.jpg',0)sobelx = cv2.Sobel(img,cv2.CV_64F,1,0,ksize=5)sobely = cv2.Sobel(img,cv2.CV_64F,0,1,ksize=5)laplacian =cv2.Laplacian(img,cv2.CV_64F)title = ['original','sobelx','sobely','laplacian']images = [img,sobelx,sobely,laplacian]for i in range(4):    plt.subplot(2,2,i+1),plt.imshow(images[i],'gray'),plt.title(title[i])    plt.xticks([]),plt.yticks([])plt.show()

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