对这个原理不是很理解 直接上代码吧

import cv2
# 读取图片
gray = cv2.imread("gauss.png", cv2.IMREAD_GRAYSCALE)
# laplacian边缘检测
laplacian =cv2.Laplacian(gray, cv2.CV_64F)
# 显示
cv2.imshow("gray", gray)
cv2.imshow("laplacian", laplacian)
cv2.waitKey()