Python OpenCV: Flip image Using cv2.flip()

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In this tutorial, we will use an example to show you how to use cv2.flip() to flip image in python opencv.

Python OpenCV - Flip image Using cv2.flip() for Beginners

1.Open an image

import cv2

img = cv2.imread('data/src/lena.jpg')
print(type(img))
# <class 'numpy.ndarray'>

print(img.shape)
# (225, 400, 3)

2.Use cv2.flip() to flip images

We should notice:

cv2.flip() flip images according to the value of flipCode as follows:

  • flipcode = 0: flip vertically
  • flipcode > 0: flip horizontally
  • flipcode < 0: flip vertically and horizontally

Here is an example:

img_flip_ud = cv2.flip(img, 0)
cv2.imwrite('data/dst/lena_cv_flip_ud.jpg', img_flip_ud)
# True

img_flip_lr = cv2.flip(img, 1)
cv2.imwrite('data/dst/lena_cv_flip_lr.jpg', img_flip_lr)
# True

img_flip_ud_lr = cv2.flip(img, -1)
cv2.imwrite('data/dst/lena_cv_flip_ud_lr.jpg', img_flip_ud_lr)
# True

Run this code, you may find this resultant image:

Python OpenCV - Flip image Using cv2.flip()