python计算黑白图像像素值

import numpy as np
import cv2

#读入图像
img = cv2.imread('dataset/mask/00004.png')
img = cv2.resize(img, (128, 128))

#灰度化
GrayImage=cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
#二值化
ret, thresh2=cv2.threshold(GrayImage,127,255,cv2.THRESH_BINARY_INV)
img = np.array(thresh2)
x, y = img.shape  #x:高；y:宽
w = 0
b = 0
for row in range(x):
    for col in range(y):
        if (img[row][col]) == 0:
            w = w+1
        else:
            b = b+1

rate1 = w/(x*y)
rate2 = b/(x*y)
print("白色占比:", round(rate1*100,2),'%')
print("黑色占比:", round(rate2*100,2),'%')

图像

结果