Show difference maps for near duplicate images in report

[sanjanag]

The diff image should look like this

base_image_gray = cv2.cvtColor(np.array(base_image), cv2.COLOR_RGB2GRAY)
near_duplicate_img_gray = cv2.cvtColor(np.array(near_duplicate_img), cv2.COLOR_RGB2GRAY)
diff_map = cv2.absdiff(base_image_gray, near_duplicate_img_gray)

Also, need to keep in mind, how to show differences if there are more than 2 images