Python代码库OpenCV之04读取图片绘制直方图（含代码）

展开成直方图

代码

import numpy as np
import cv2
from matplotlib import pyplot as plt
color = ['b','g','r']
image = cv2.imread("D:\\pythondev\\dev\\opencv\\img\\tu.png")
histogram_image = cv2.calcHist([image], [0], None, [256], [0,256])
plt.hist(histogram_image.ravel(), 256, [0,256])
plt.show()

效果

分离颜色通道

代码

import numpy as np
import cv2
from matplotlib import pyplot as plt
image = cv2.imread("D:\\pythondev\\dev\\opencv\\img\\tu.png")
color = ['b','g','r']
#seperate the colors and plot the histogram
for i, col in enumerate(color):
    hist = cv2.calcHist([image], [i], None, [256], [0,256])
    plt.plot(hist, color = col)
    plt.xlim([0,256])

plt.show()

运行效果

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