Basic use of OpenCV2 __OPENCV

This paper mainly expounds the use of some basic functions of OpenCV2.

Install the OpenCV2 under Ubuntu:

Pip Install Opencv-python

Read images with Cv2.imread ()

Cv2.imwrite for stored images ()

Scaling using Cv2.resize ()

Example

Import Cv2

# read an image
test_img = cv2.imread (' test.jpg ')
print (test_img)

# Zoom a 200*200 picture
Img_ Resize = Cv2.resize (test_img, (200,200))
# Zoom to the previous half
img_resize1 = Cv2.resize (test_img, (0,0), fx=0.5, fy=0.5)

# Store Img_resize picture, specify picture quality of 90, default
Cv2.imwrite (' test_new.jpg ', Img_resize, Cv2. imwrite_jpeg_quality)

# to cut 0:200 pictures of the first dimension of the array, that is, take the picture matrix 0 to 200 rows, that is, the high patch_img of the interception of pictures
= img[0:200, 300:600]