图像切割

#!/usr/bin/env python 
# -*- coding:utf-8 -*-

from PIL import Image
from tqdm import tqdm
import os, math


def image_crop(data_dir, save_dir, size):
    if not os.path.exists(save_dir):
        os.mkdir(save_dir)

    path = os.path.join(data_dir)

    img_list = os.listdir(path)

    progress_bar = tqdm(img_list)

    for img in progress_bar:

        progress_bar.set_description('正在切割{}图片'.format(img))

        a = 0

        # if img.endswith('.png') or img.endswith('.jpg' ):
        if img.endswith('.png'):
            img_name = path + '/' + img

            im = Image.open(img_name)
            w, h = im.size
            # 这里是将[1024, 1024]裁剪为[256, 256]
            # 竖着切割
            for i in range(math.ceil(w/size)):

                for j in range(math.ceil(h/size)):
                    x = i * size

                    y = j * size
                    region = im.crop((x, y, x + size, y + size))

                    region.save(save_dir + '/' + img.split('.')[0] + '_' + str(a) + '.png')
                    a += 1


data_dir = r"G:\datas\all_change_detect_datas\train\LEVIR-CD\test\A"  # 原数据集位置
save_dir = r"G:\datas\all_change_detect_datas\train\LEVIR-CD\crop\test\A"  # 新数据集位置
image_crop(data_dir, save_dir, size=512)