January 2018
Intermediate to advanced
268 pages
6h 20m
English
Content preview from OpenCV 3.x with Python By Example - Second Edition
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Image rotation
In this section, we will see how to rotate a given image by a certain angle. We can do it using the following piece of code:
import cv2import numpy as npimg = cv2.imread('images/input.jpg')num_rows, num_cols = img.shape[:2]rotation_matrix = cv2.getRotationMatrix2D((num_cols/2, num_rows/2), 30, 0.7)img_rotation = cv2.warpAffine(img, rotation_matrix, (num_cols, num_rows))cv2.imshow('Rotation', img_rotation)cv2.waitKey()
If you run the preceding code, you will see an image like this:
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