掩模直方图均衡化

import cv2
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.pyplot as plt
o=cv2.imread('C:/Users/xpp/Desktop/coins.png',cv2.IMREAD_GRAYSCALE)#原始图像
equ=cv2.equalizeHist(o)#灰度直方图均衡化
cv2.imshow("original",o)
cv2.imshow("result",equ)
mask=np.zeros(equ.shape, np.uint8)
mask[200:400,200:400]=255
histImage=cv2.calcHist([o],[0],None,[256],[0,255])#绘制灰度直方图均衡化
histMI=cv2.calcHist([equ],[0],mask,[256],[0,255])#绘制掩模直方图均衡化
plt.plot(histImage)
plt.plot(histMI)
cv2.waitKey()
cv2.destroyAllWindows()