from PIL import Image
import numpy as np
import os
from osgeo import gdal


mask_dir = r"E:\RSdata\wlk_right_448\mask_png_ori"  # 修改为你的mask文件夹路径

all_labels = set()

for file in os.listdir(mask_dir):
    if file.lower().endswith('.png'):
        img = Image.open(os.path.join(mask_dir, file))
        img = np.array(img)
        unique = np.unique(img)
        all_labels.update(unique)

print("所有mask中出现过的标签数字：", sorted(all_labels))