OpenCV顶帽

#顶帽：输入图像和图像开运算之差，下面的示例针对9*9内核完成。
import cv2 as cv
import numpy as np
import matplotlib.pyplot as plt
img = cv.imread('test9.jpg')
img = cv.cvtColor(img,cv.COLOR_BGR2RGB)
kernel = np.ones((5,5),np.uint8)
tophat = cv.morphologyEx(img,cv.MORPH_TOPHAT,kernel)
plt.subplot(121),plt.imshow(img),plt.title('Original')
plt.xticks([]),plt.yticks([])
plt.subplot(122),plt.imshow(tophat),plt.title('tophat')
plt.xticks([]),plt.yticks([])
plt.show()