如何统计python opencv中某个像素值的像素数？

import cv2
import numpy as np

image = cv2.imread('image.jpg')

gray_image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

pixel_value = 255  # 要统计的像素值
count = np.count_nonzero(gray_image == pixel_value)

print("像素值为 {} 的像素数为 {}".format(pixel_value, count))

import cv2
import numpy as np

image = cv2.imread('image.jpg')
gray_image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

pixel_value = 255  # 要统计的像素值
count = np.count_nonzero(gray_image == pixel_value)

print("像素值为 {} 的像素数为 {}".format(pixel_value, count))