OpenCV_RotateImages

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#      CHUNGU CHAMA                   #
#- This rotates the image used in the #
#  at different angles                #
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import cv2  

# read image as greyscale  

img = cv2.imread('lena.jpg') 
# get image height, width  
(h, w) = img.shape[:2]  
# calculate the center of the image  
center = (w / 2, h / 2)  
  
angle90 = 90  
angle180 = 180  
angle270 = 270  
  
scale = 1.0  
  
# Perform the counterclockwise rotation holding at the center  
# 90 degrees  
M = cv2.getRotationMatrix2D(center, angle90, scale)  
rotated90 = cv2.warpAffine(img, M, (h, w))  
  
# 180 degrees  
M = cv2.getRotationMatrix2D(center, angle180, scale)  
rotated180 = cv2.warpAffine(img, M, (w, h))  
  
# 270 degrees  
M = cv2.getRotationMatrix2D(center, angle270, scale)  
rotated270 = cv2.warpAffine(img, M, (h, w))  
  
cv2.imshow('Original Image', img)  
cv2.waitKey(0)  # waits until a key is pressed  
cv2.destroyAllWindows()  # destroys the window showing image  
  
cv2.imshow('Image rotated by 90 degrees', rotated90)  
cv2.waitKey(0)  # waits until a key is pressed  
cv2.destroyAllWindows()  # destroys the window showing imag  
  
cv2.imshow('Image rotated by 180 degrees', rotated180)  
cv2.waitKey(0)  # waits until a key is pressed  
cv2.destroyAllWindows()  # destroys the window showing image  
  
cv2.imshow('Image rotated by 270 degrees', rotated270)  
cv2.waitKey(0)  # waits until a key is pressed  
cv2.destroyAllWindows()  # destroys the window showing image