Opencv-python Learning Notes __python

* * output picture

**
Import the CV2 package in OpenCV, and then have functions like imread,imshow to read and display the picture.

Cv2.waitkey (0) to keep the window, waiting for the keyboard input, if the keyboard does not enter, it will always wait.
Cv2.destroyallwindows () deletes any window that we want to delete.

Focus on Cv2.namedwindow ("image", Cv2. Window_normal), it allows the displayed picture to automatically resize the shape. Without this line of code, there is no corresponding effect.

Import cv2

img=cv2.imread (' 09.jpg ')
Cv2.namedwindow ("image", Cv2. Window_normal)
cv2.imshow ("image", img)
cv2.waitkey (0)
cv2.destroyallwindows ()

Diagram:

Original:

To stretch a picture manually: