DocumentAIKit/fonts_images_generate/img_tools.py

import cv2


def img_resize(img_path):
    img = cv2.imread(img_path)
    width = img.shape[1]
    height = img.shape[0]
    if height != 48:
        ratio = 35 / height
        height = 35
        width = int(width * ratio)
        dim = (width, height)
        resized = cv2.resize(img, dim, interpolation=cv2.INTER_AREA)
        width = resized.shape[1]
        height = resized.shape[0]
        if width < 960:
            left = int((960 - width) / 2)
            top = int((48 - height) / 2)
            ret = cv2.copyMakeBorder(resized, top, 48 - height - top, left, 960 - width - left, cv2.BORDER_CONSTANT,
                                     value=(255, 255, 255))
            cv2.imwrite(img_path, ret)