image.py

import numpy as np
import cv2
from io import BytesIO


def resize_by_max(image, max_side=512, force=False):
    h, w = image.shape[:2]
    if max(h, w) < max_side and not force:
        return image
    ratio = max(h, w) / max_side

    w = int(w / ratio + 0.5)
    h = int(h / ratio + 0.5)
    return cv2.resize(image, (w, h))