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  • 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 cv2
    import numpy as np
    import matplotlib.pyplot as plt
    img = cv2.imread('D:/pythonob/imageinpaint/img/flower.jpg',1)
    imgInfo = img.shape
    height = 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] + 1
    for 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_b
    y2 = count_g
    y3 = count_r
    plt.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:

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  • 原文地址:https://www.cnblogs.com/cxxBoo/p/11480657.html
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