OpenCV初探

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 1 import cv2 as cv
 2 
 3 
 4 def test_read():
 5     img=cv.imread('face.jpg')
 6     cv.imshow('read_img',img)
 7     # 给读入取名为'read_img'
 8     cv.waitKey(1000)
 9     # 等待键盘输入（单位毫秒）0为无限等待
10     cv.destroyAllWindows()
11     # 释放内存 OpenCV 底层为C++
12 
13 
14 def color2grey():
15     src=cv.imread('face.jpg')
16     cv.imshow('input image',src)
17     gray_img=cv.cvtColor(src,cv.COLOR_BGR2GRAY)
18     cv.imshow('gray_image',gray_img)
19     # saving the gray image at the same dir
20     cv.imwrite('gray_face.jpg',gray_img)
21     cv.waitKey(0)
22     cv.destroyAllWindows()
23 
24 
25 test_read()
26 color2grey()
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