downscale_images.py 文件源码

def downscale(old_file_name):
    img = cv2.imread(os.path.join(old_file_name))

    new_file_name = (old_file_name
                     .replace('training', 'training_' + str(min_size))
                     .replace('validation', 'validation_' + str(min_size))
                     .replace('testing', 'testing_' + str(min_size))
                     )

    height, width, _ = img.shape

    if width > height:
        new_width = int(1.0 * width / height * min_size)
        new_height = min_size

    else:
        new_height = int(1.0 * height / width * min_size)
        new_width = min_size

    img_new = cv2.resize(img, (new_width, new_height), interpolation=cv2.INTER_LINEAR)
    cv2.imwrite(new_file_name, img_new)