OpenCV Python CalcHist :如何堆叠RGB值范围内的像素数？

import cv2
import numpy as np

image = cv2.imread('image.jpg')
image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)

red_range = [0, 60]
green_range = [61, 120]
blue_range = [121, 180]

hsv_image = cv2.cvtColor(image, cv2.COLOR_RGB2HSV)

hist = np.zeros((180,), dtype=np.int)

for row in hsv_image:
    for pixel in row:
        hue = pixel[0]
        if red_range[0] <= hue <= red_range[1]:
            hist[hue] += 1
        elif green_range[0] <= hue <= green_range[1]:
            hist[hue] += 1
        elif blue_range[0] <= hue <= blue_range[1]:
            hist[hue] += 1

print(hist)