prepare_labels.py

"""
标签数据预处理脚本
将TIF格式的标签转换为PNG格式的二值mask
"""
import os
import numpy as np
from PIL import Image
import rasterio
from pathlib import Path
import shutil

def convert_tif_label_to_png_mask(tif_path, output_path, threshold=1):
    """将TIF标签转换为PNG二值mask"""
    try:
        with rasterio.open(tif_path) as src:
            # 读取第一个波段
            label_data = src.read(1)
            
            # 创建二值mask (0: 背景, 255: 前景)
            mask = np.zeros_like(label_data, dtype=np.uint8)
            mask[label_data >= threshold] = 255
            
            # 保存为PNG
            mask_img = Image.fromarray(mask, mode='L')
            mask_img.save(output_path)
            
            print(f"转换: {tif_path} -> {output_path}")
            print(f"  原始数据范围: {label_data.min()} - {label_data.max()}")
            print(f"  Mask唯一值: {np.unique(mask)}")
            return True
            
    except Exception as e:
        print(f"转换失败 {tif_path}: {str(e)}")
        return False

def prepare_dataset_labels():
    """准备数据集标签"""
    
    # 创建mask目录
    train_mask_dir = Path("data/train/masks")
    val_mask_dir = Path("data/val/masks")
    test_mask_dir = Path("data/test/masks")
    
    train_mask_dir.mkdir(parents=True, exist_ok=True)
    val_mask_dir.mkdir(parents=True, exist_ok=True)
    test_mask_dir.mkdir(parents=True, exist_ok=True)
    
    # 处理训练集标签
    train_label_dir = Path("data/train/labels")
    if train_label_dir.exists():
        print("处理训练集标签...")
        label_files = [f for f in train_label_dir.glob("*.TIF")]
        
        for label_file in label_files:
            # 获取对应的图像文件名
            # 假设标签文件名是 labelXXXXX.TIF，图像是 patchXXXXX.TIF
            label_name = label_file.stem  # label10012
            if label_name.startswith('label'):
                # 提取数字部分
                number = label_name[5:]  # 10012
                image_name = f"patch{number}.TIF"
                
                # 检查对应的图像是否存在
                image_path = Path("data/train/images") / image_name
                if image_path.exists():
                    # 转换标签为mask
                    mask_name = f"patch{number}.png"
                    mask_path = train_mask_dir / mask_name
                    
                    if convert_tif_label_to_png_mask(str(label_file), str(mask_path)):
                        print(f"  成功: {label_name} -> {mask_name}")
                else:
                    print(f"  警告: 找不到对应的图像 {image_name}")
    
    # 处理验证集标签
    val_label_dir = Path("data/val/labels")
    if val_label_dir.exists():
        print("\n处理验证集标签...")
        label_files = [f for f in val_label_dir.glob("*.TIF")]
        
        for label_file in label_files:
            label_name = label_file.stem
            if label_name.startswith('label'):
                number = label_name[5:]
                image_name = f"patch{number}.TIF"
                
                image_path = Path("data/val/images") / image_name
                if image_path.exists():
                    mask_name = f"patch{number}.png"
                    mask_path = val_mask_dir / mask_name
                    
                    if convert_tif_label_to_png_mask(str(label_file), str(mask_path)):
                        print(f"  成功: {label_name} -> {mask_name}")
    
    # 处理测试集标签
    test_label_dir = Path("data/test/labels")
    if test_label_dir.exists():
        print("\n处理测试集标签...")
        label_files = [f for f in test_label_dir.glob("*.TIF")]
        
        for label_file in label_files:
            label_name = label_file.stem
            if label_name.startswith('label'):
                number = label_name[5:]
                image_name = f"patch{number}.TIF"
                
                image_path = Path("data/test/images") / image_name
                if image_path.exists():
                    mask_name = f"patch{number}.png"
                    mask_path = test_mask_dir / mask_name
                    
                    if convert_tif_label_to_png_mask(str(label_file), str(mask_path)):
                        print(f"  成功: {label_name} -> {mask_name}")
    
    print("\n标签数据准备完成！")

def check_data_integrity():
    """检查数据完整性"""
    print("\n检查数据完整性...")
    
    datasets = [
        ("训练集", "data/train/images", "data/train/masks"),
        ("验证集", "data/val/images", "data/val/masks"),
        ("测试集", "data/test/images", "data/test/masks")
    ]
    
    for name, image_dir, mask_dir in datasets:
        image_path = Path(image_dir)
        mask_path = Path(mask_dir)
        
        if image_path.exists() and mask_path.exists():
            image_files = list(image_path.glob("*.TIF"))
            mask_files = list(mask_path.glob("*.png"))
            
            print(f"{name}:")
            print(f"  图像文件: {len(image_files)} 个")
            print(f"  Mask文件: {len(mask_files)} 个")
            
            # 检查匹配情况
            matched = 0
            for image_file in image_files:
                expected_mask = mask_path / (image_file.stem + ".png")
                if expected_mask.exists():
                    matched += 1
            
            print(f"  匹配文件: {matched} 个")
            if matched < len(image_files):
                print(f"  ⚠️  警告: 有 {len(image_files) - matched} 个图像缺少对应的mask")
        else:
            print(f"{name}: 目录不存在")

if __name__ == "__main__":
    print("开始准备标签数据...")
    prepare_dataset_labels()
    check_data_integrity()
    print("\n数据准备完成！")