image operations.py

import sys, cv2
import matplotlib.pyplot as plt

## Load the image
f = sys.argv[1]
img = cv2.imread('/a.jpeg')

## display the image
plt.imshow(img)
plt.show()

## Cropping an image
h, w = img.shape[:2]
sr, er = int(0.21*h), int(0.73*h)
sc, ec = int(0.37*w), int(0.92*w)

## crop image using numpy 
img_cropped = img[sr:er, sc:ec]
plt.imshow(img_cropped)
plt.show()

## Resize image to 1.3 times original size
## Scale the image unifiormly 
# scaling_factor = 1.3
# img_scaled = cv2.resize(img, None,fx = scaling_factor )
# plt.imshow(img_scaled)
# plt.show()

## save the cropped image to an output file
output_file = f[:-4] + '_cropped.jpg'
cv2.imwrite(output_file,img_cropped)
## display images until key is pressed
cv2.waitKey()