python opencv load image

1import cv2
2img = cv2.imread('/path_to_image/opencv-logo.png')
3cv2.imshow('image',img)
4cv2.waitKey(0)
5cv2.destroyAllWindows()
6
7# to use it in a loop
8k = cv2.waitKey(0)
9if k == 27:         # wait for ESC key to exit
10    cv2.destroyAllWindows()
11elif k == ord('s'): # wait for 's' key to save and exit
12    cv2.imwrite('messigray.png',img)
13    cv2.destroyAllWindows()
14

1    import numpy as np
2    import cv2
3    import matplotlib.pyplot as plt
4    %matplotlib inline # if you are running this code in jupyter notebook
5
6    img = cv2.imread('/path_to_image/opencv-logo.png',0) # reads image 'opencv-logo.png' as grayscale
7    plt.imshow(img, cmap='gray')

1img = cv2.imread('filename.jpg',1)