To resize and pad images

resize_pad.py

import cv2
import os

desired_size = (540,960)

path = ""
path2 = ""

files = os.listdir(path)

counter = 0
for f in files:
    if not '.jpg' in f:
        continue
    im = cv2.imread(path+f)
    old_size = im.shape[:2] # old_size is in (height, width) format

    ratio = min(desired_size[0]/old_size[0],desired_size[1]/old_size[1])
    new_size = tuple([int(x*ratio) for x in old_size])
    # new_size should be in (width, height) format

    im = cv2.resize(im, (new_size[1], new_size[0]))

    delta_w = abs(desired_size[1] - new_size[1])
    delta_h = abs(desired_size[0] - new_size[0])
    top, bottom = delta_h//2, delta_h-(delta_h//2)
    left, right = delta_w//2, delta_w-(delta_w//2)

    color = [255, 255, 255]
    # print(top, bottom, left, right)
    new_im = cv2.copyMakeBorder(im, top, bottom, left, right, cv2.BORDER_CONSTANT,
        value=color)
    cv2.imwrite(path2+f, new_im)
    counter += 1
    print(counter, end='\r')
    # cv2.imshow("image", new_im)
    # cv2.waitKey(0)
    # cv2.destroyAllWindows()