opencv in cv2.namedWindow () function uses

Usage:
cv2.namedWindow ( 'window title', default parameters)
window size can be changed:

cv2.namedWindow("image",cv2.WINDOW_NORMAL)
或者cv2.namedWindow('image',cv2.WINDOW_GUI_NORMAL)

Window size can not be changed:

cv2.namedWindow("image",cv2.WINDOW_AUTOSIZE)

Adaptive window size ratio:

cv2.namedWindow("image",cv2.WINDOW_FREERATIO)

Window size remains the ratio:

cv2.namedWindow("image",cv2.WINDOW_KEEPRATIO)    

Display color becomes dark:

cv2.namedWindow('image',cv2.WINDOW_GUI_EXPANDED)

cv2.imshow ( 'window title', image), if there is no front cv2.namedWindow, to automatically perform a cv2.namedWindow ()