OpenCV 直方图处理

作者：ccccting

案列：© Fu Xianjun. All Rights Reserved.

目录

直方图处理

1.绘制直方图

2. 绘制统计直方图

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直方图处理

1.绘制直方图

import cv2
import matplotlib.pyplot as plt

img = cv2.imread('1.jpg')
plt.hist(img.ravel(),16)
plt.show()

2. 绘制统计直方图

import cv2
import matplotlib.pyplot as plt
img=cv2.imread("1.jpg")
histb = cv2.calcHist([img], [0], None, [256], [0,255])
histg = cv2.calcHist([img], [1], None, [256], [0,255])
histr = cv2.calcHist([img], [2], None, [256], [0,255])
plt.subplot(131)
plt.plot(histb, color='b')
plt.subplot(132)
plt.plot(histg, color='g')
plt.subplot(133)
plt.plot(histr, color='r')
plt.savefig('histogram.png')
plt.show()