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彩色直方图.py

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+import cv2 as cv
+import matplotlib.pyplot as plt
+import numpy as np
+ 
+img = cv.imread('./da.jpg')
+cv.imshow('Img', img)
+ 
+plt.figure()
+plt.title('Color Histogram')
+plt.xlabel('level')
+plt.ylabel('number of pixels')
+colors = ('b', 'g', 'r')
+for i,item in enumerate(colors):
+     hist = cv.calcHist([img], [i], None, [256], [0,256])
+     plt.plot(hist, color=item)
+     plt.xlim([0,256])
+ 
+plt.show()
+