Color image loaded by OpenCV is in BGR mode.But Matplotlib displays in RGB mode.So color images will not be displayed correctly in Matplotlib if image is read with OpenCV.Please see the exercises for more details.(引自文档)
import numpy as np import cv2 from matplotlib import pyplot as plt ‘‘‘ img = cv2.imread(‘cute.jpg‘,0) plt.imshow(img,cmap=‘gray‘,interpolation=‘bicubic‘) plt.xticks([],plt.yticks([])) # to hide tick values on X and Y axis plt.show() ‘‘‘ ‘‘‘ Color image loaded by OpenCV is in BGR mode. But Matplotlib displays in RGB mode. So color images will not be displayed correctly in Matplotlib if image is read with OpenCV. Please see the exercises for more details. ‘‘‘ img = cv2.imread(‘cute.jpg‘) b, g, r = cv2.split(img) img2 = cv2.merge([r,g,b]) # img2 = img[:,:,::-1] this can be faster plt.subplot(121);plt.imshow(img) # expects distorted color plt.subplot(122);plt.imshow(img2) # expects true color plt.show() cv2.imshow(‘bgr image‘,img) # expects true color cv2.imshow(‘rgb image‘,img2) # expects distrorted color cv2.waitKey(0) cv2.destroyAllWindows()
图像输出：
Matlpotlib输出：
OpenCV输出：
Python OpenCV ——Matplotlib显示图片
原文：http://www.cnblogs.com/buzhizhitong/p/5918472.html