python中Laplacian算子是什么

import cv2 as cv

    import matplotlib.pyplot as plt

    # 读取图像

    img = cv.imread('data.jpg', cv.COLOR_BGR2GRAY)

    rgb_img = cv.cvtColor(img, cv.COLOR_BGR2RGB)

    # 灰度化处理图像

    grayImage = cv.cvtColor(img, cv.COLOR_BGR2GRAY)

    # Laplacian

    dst = cv.Laplacian(grayImage, cv.CV_16S, ksize = 3)

    Laplacian = cv.convertScaleAbs(dst)

    # 用来正常显示中文标签

    plt.rcParams['font.sans-serif'] = ['SimHei']

    # 显示图形

    titles = ['原始图像', 'Laplacian 算子']

    images = [rgb_img, Laplacian]

    for i in range(2):

        plt.subplot(1, 2, i + 1), plt.imshow(images[i], 'gray')

        plt.title(titles[i])

        plt.xticks([]), plt.yticks([])

    plt.show()