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Rotate the Image in Python using OpenCV

6 Rotating the Image

Rotate the Image in Python using OpenCV

In [2]:
import cv2
img = cv2.imread('machinelearning.png',1)
cv2.imshow('Machine Learning',img)
cv2.waitKey(0)
cv2.destroyAllWindows()

Rotating the Image

There are a lot of steps involved in rotating an image. The 2 main functions used here are –

  • getRotationMatrix2D()
  • warpAffine()

getRotationMatrix2D() : It takes 3 arguments

  • center – The center coordinates of the image
  • Angle – The angle (in degrees) by which the image should be rotated
  • Scale – The scaling factor

warpAffine()

  • The function warpAffine transforms the source image using the rotation matrix:
In [3]:
import cv2
img = cv2.imread('machinelearning.png',1)

h,w = img.shape[:2]
center = (w // 2, h // 2) 
matrix = cv2.getRotationMatrix2D(center, 45, 0.5)  
rotated = cv2.warpAffine(img, matrix, (w, h)) 

cv2.imshow('Machine Learning',rotated)
cv2.waitKey(0)
cv2.destroyAllWindows()

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