Python代码片

 1 # -*- coding: utf-8 -*-
 2 """
 3 Created on Fri Jun  5 16:18:07 2020
 4 
 5 @author: shiruiyu
 6 """
 7 
 8 import cv2 as cv
 9 import matplotlib
10 import matplotlib.pyplot as plt
11 
12 
13 
14 img = cv.imread("d:/lena.png", -1);
15 cv.imshow("img", img);
16 
17 img_gray = cv.cvtColor(img, cv.COLOR_RGB2GRAY);
18 cv.imshow("img_gray", img_gray);
19 
20 # 显示彩图， 
21 plt.subplot(121); plt.title("BGR2RGB"); 
22 plt.imshow(cv.cvtColor(img,cv.COLOR_BGR2RGB)); # 注意转换色彩次序
23 
24 # 显示灰度图
25 plt.subplot(122);
26 plt.imshow(cv.cvtColor(img, cv.COLOR_RGB2GRAY), cmap = ‘gray‘) #注意后面参数