utils/image_processing.py

import cv2


def resize_image(image, width=None, height=None):
    if width is None and height is None:
        return image

    (h, w) = image.shape[:2]
    if width is None:
        ratio = height / float(h)
        width = int(w * ratio)
    else:
        ratio = width / float(w)
        height = int(h * ratio)

    return cv2.resize(image, (width, height))