彩色直方图（源码实现）

原理：和灰度直方图一样，只是将一个灰度通道换成了三个的RGB通道import cv2import numpy as npimport matplotlib.pyplot as pltimg = cv2.imread('D:/pythonob/imageinpaint/img/flower.jpg',1)imgInfo = img.shapeheight = imgInfo[0]width = imgInfo[1]count_b = np.zeros(256,np.float)count_g = np.zeros(256,np.float)count_r = np.zeros(256,np.float)for i in range(0,height):    for j in range(0,width):        (b,g,r) = img[i,j]        index_b = int(b)        index_g = int(g)        index_r = int(r)        count_b[index_b] = count_b[index_b]+1        count_g[index_g] = count_g[index_g] + 1        count_r[index_r] = count_r[index_r] + 1for i in range(0,256):    count_b[i] = count_b[i]/(height*width)    count_g[i] = count_g[i] / (height * width)    count_r[i] = count_r[i] / (height * width)x = np.linspace(0,255,256)y1 = count_by2 = count_gy3 = count_rplt.figure()plt.bar(x,y1,0.9,alpha = 1 ,color = 'b')plt.figure()plt.bar(x,y2,0.9,alpha = 1 ,color = 'g')plt.figure()plt.bar(x,y3,0.9,alpha = 1 ,color = 'r')plt.show()cv2.waitKey(0)

效果图：