feat(detect): YOLO 数据集统一为 PNG、按类别重命名并附 classes.txt

- 图片统一成 PNG。pearlescent / blue / uv 的原始数据是 BMP，generate_boxes.py
  按原后缀链接，于是 runs/boxes_shap 里 3685 张 BMP 与 7526 张 PNG 混在一起，
  ripple 与 uneven 两类全是 BMP。按文件头（而非后缀）判断：真 PNG 照旧硬链接，
  其余无损转换，不缩放像素，归一化框坐标原样有效；CMYK 等 PNG 存不下的模式转 RGB。
  在真实数据上核对过 3685 张转换结果逐像素一致。
- 文件按 <类别>_<序号> 重新编号。类别取标签第一列，文件名不会与标签矛盾；
  序号在类内按源路径排序、与划分无关，换种子重跑名字不变。新旧名对照写入
  name_map.csv，源文件名里的正反面、位置、时间戳不丢。--keep-names 保留原名。
- 输出 classes.txt（行号即 class_id），供 LabelImg / X-AnyLabeling 复核框时使用。
- 撞名检查改为按输出文件名的小写比较：统一后缀后 a.png 与 a.bmp 会撞，
  macOS 默认文件系统也不区分大小写。

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

README.md

@@ -610,12 +610,29 @@ uv run python detect.py --config configs/detect/film.yaml --resume
 
 ```
 data/boxes_gradcam/
-├── images/{train,val}/<图名>.png    # 硬链接到 runs/，再到 data/raw/ 的原图
-├── labels/{train,val}/<图名>.txt
+├── images/{train,val}/<类别>_<序号>.png   # 一律 PNG：PNG 原图硬链接，BMP 等无损转换
+├── labels/{train,val}/<类别>_<序号>.txt
+├── classes.txt                      # 每行一个类别名，行号即 class_id
+├── name_map.csv                     # 新文件名 ↔ 源文件路径
 ├── data.yaml                        # path 写绝对路径，ultralytics 从哪跑都能读到
-└── summary.json                     # 划分明细、逐类数量、链接方式
+└── summary.json                     # 划分明细、逐类数量、落盘方式
 ```
 
+**图片统一成 PNG。** pearlescent / blue / uv 的原始数据是 BMP（共 10,814 张），
+`generate_boxes.py` 按原后缀链接，于是 YOLO 数据集里会混着两种格式。这一步按**文件头**
+（不是后缀）判断：真 PNG 照旧硬链接不占磁盘，其余无损转 PNG——不缩放像素，归一化的框坐标
+原样有效；CMYK 这类 PNG 存不下的模式转 RGB。转换无法硬链接，会占额外磁盘，`--dry-run`
+会先报出要转多少张。统一后缀后 `a.png` 与另一目录的 `a.bmp` 会撞名，脚本直接报错。
+
+**按类别重新编号。** 源文件名五花八门（`反面纵黑点_1_550mmX1561.71m_20260416160441_0.png`、
+`pearlescent_404.bmp`……），输出统一改成 `<类别>_<序号>.png`，如 `blackdot_0042.png`。
+类别以标签第一列为准，文件名永远不会与标签矛盾；序号在类内按源路径排序、与 train/val 划分
+无关，换 `--seed` 或 `--val-ratio` 重跑，同一张图拿到的名字不变。原文件名里的正反面、位置、
+时间戳等信息都在 `name_map.csv` 里（带 BOM，Excel 直接打开中文不乱码）。想保留原名加 `--keep-names`。
+
+**classes.txt** 是给 LabelImg / X-AnyLabeling 这类标注工具用的，人工复核、修改框时
+靠它把 class_id 映射回类别名；ultralytics 训练本身只读 `data.yaml`，两者内容严格一致。
+
 ### 划分
 
 按类别分层（`--val-ratio` 默认 0.2，`--seed` 默认 42，两次运行结果一致）。分层是必需的：

datasets/yolo.py

@@ -18,6 +18,21 @@ from pathlib import Path
 IMAGE_SUFFIXES = (".png", ".jpg", ".jpeg", ".bmp", ".tif", ".tiff", ".webp")
 
 
+def write_classes_txt(path: str | Path, classes: Sequence[str]) -> Path:
+    """写 classes.txt：每行一个类别名，行号（从 0 起）即标签里的 class_id。
+
+    ultralytics 训练只读 data.yaml；这份是给 LabelImg / X-AnyLabeling 之类
+    标注工具用的——人工复核、修改框时它们靠它把 class_id 映射回类别名。
+    """
+    bad = [name for name in classes if not name.strip() or "\n" in name]
+    if bad:
+        raise ValueError(f"类别名不能为空或包含换行，否则行号与 class_id 对不上: {bad!r}")
+    path = Path(path)
+    path.parent.mkdir(parents=True, exist_ok=True)
+    path.write_text("".join(f"{name}\n" for name in classes), encoding="utf-8")
+    return path
+
+
 def write_data_yaml(
     path: str | Path,
     classes: Sequence[str],

scripts/prepare_yolo_dataset.py

@@ -16,13 +16,22 @@ runs/boxes_gradcam/
 
 1. 把按类别分的目录拍平，按 train/val 重新组织；
 2. **按类别分层**切分，小类不至于在验证集里挂零；
-3. 全部用**硬链接**，不占额外磁盘。
+3. 图片**统一成 PNG**：本来就是 PNG 的硬链接过去，不占额外磁盘；BMP 等其他格式
+   （pearlescent / blue / uv 原始数据都是 BMP）无损转成 PNG。不缩放像素，
+   归一化的框坐标原样有效。
+
+4. 文件**按类别重新编号**：`<类别>_<序号>.png`，序号在类内按源路径排序，重跑结果一致。
+   原文件名里的正反面、位置、时间戳等信息记在 `name_map.csv` 里，不会丢。
+   想保留原名加 `--keep-names`。
 
 ```
 data/<name>/
-├── images/{train,val}/<图名>.png
-├── labels/{train,val}/<图名>.txt
-└── data.yaml
+├── images/{train,val}/<类别>_<序号>.png
+├── labels/{train,val}/<类别>_<序号>.txt
+├── classes.txt      # 每行一个类别名，行号即 class_id，给标注工具复核用
+├── name_map.csv     # 新名 ↔ 源文件对照
+├── data.yaml
+└── summary.json
 ```
 
 没有框的图（标签为空）默认保留：YOLO 训练里它们是负样本，有助于压低误检。但**空标签的
@@ -36,6 +45,7 @@ data/<name>/
 from __future__ import annotations
 
 import argparse
+import csv
 import errno
 import json
 import os
@@ -51,7 +61,7 @@ sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
 
 import yaml  # noqa: E402
 
-from datasets.yolo import IMAGE_SUFFIXES, write_data_yaml  # noqa: E402
+from datasets.yolo import IMAGE_SUFFIXES, write_classes_txt, write_data_yaml  # noqa: E402
 from utils import setup_logging  # noqa: E402
 
 logger = None
@@ -64,6 +74,37 @@ EMPTY_POLICY_DESC = {
 }
 
 
+PNG_SIGNATURE = b"\x89PNG\r\n\x1a\n"
+# PNG 能原样存下的像素模式；其余（CMYK、YCbCr 等）先转 RGB
+PNG_MODES = frozenset({"1", "L", "LA", "I", "I;16", "P", "RGB", "RGBA"})
+
+
+def is_png(path: Path) -> bool:
+    """看文件头而不是后缀：后缀写着 .png、内容却是 BMP/JPEG 的也要转。"""
+    with path.open("rb") as handle:
+        return handle.read(len(PNG_SIGNATURE)) == PNG_SIGNATURE
+
+
+def materialize_png(source: Path, destination: Path) -> str:
+    """把图片落成 PNG：本来就是 PNG 的硬链接，其余格式无损转换。
+
+    返回 "hard" / "copy" / "convert"。转换不缩放像素，归一化的框坐标原样有效。
+    """
+    if is_png(source):
+        return link_or_copy(source, destination)
+
+    from PIL import Image
+
+    if destination.exists() or destination.is_symlink():
+        destination.unlink()
+    destination.parent.mkdir(parents=True, exist_ok=True)
+    with Image.open(source) as image:
+        if image.mode not in PNG_MODES:
+            image = image.convert("RGB")
+        image.save(destination, format="PNG")
+    return "convert"
+
+
 def link_or_copy(source: Path, destination: Path) -> str:
     """硬链接；跨文件系统时退回复制。"""
     if destination.exists() or destination.is_symlink():
@@ -133,6 +174,35 @@ def collect(source: Path) -> list[Sample]:
     return samples
 
 
+def class_of(sample: Sample, names: Sequence[str]) -> str:
+    """样本在输出里归属的类别名：优先看标签内容，空标签才退回来源目录名。
+
+    以标签为准，重命名后的文件名就永远不会与标签里的 class_id 矛盾。
+    """
+    if sample.class_id is not None:
+        return names[sample.class_id]
+    if sample.full_box is not None:
+        return names[sample.full_box]
+    return sample.group or "background"
+
+
+def assign_names(samples: Sequence[Sample], names: Sequence[str]) -> dict[Path, str]:
+    """按类别重新编号，返回 {源图片: 新文件名主干}，如 `blackdot_0042`。
+
+    序号在类内按源路径排序、与 train/val 划分无关：换 --val-ratio 或 --seed 重跑，
+    同一张图拿到的名字不变，已经做过的人工复核记录还能对得上。
+    """
+    by_class: dict[str, list[Sample]] = defaultdict(list)
+    for sample in samples:
+        by_class[class_of(sample, names)].append(sample)
+    width = max(4, len(str(max((len(v) for v in by_class.values()), default=0))))
+    mapping = {}
+    for name, items in by_class.items():
+        for number, sample in enumerate(sorted(items, key=lambda s: str(s.image)), start=1):
+            mapping[sample.image] = f"{name}_{number:0{width}d}"
+    return mapping
+
+
 def parse_empty_policy(tokens: Sequence[str]) -> tuple[str, dict[str, str]]:
     """解析 --empty-policy：一个可选的全局默认，加若干 `类别=策略`。
 
@@ -214,6 +284,10 @@ def main() -> int:
             "注意空标签在 YOLO 里的意思是『此图无缺陷』，缺陷类的空标签照搬会教模型抑制真实缺陷"
         ),
     )
+    parser.add_argument(
+        "--keep-names", action="store_true",
+        help="保留源文件名，不按 <类别>_<序号> 重新编号（源文件名需去掉后缀后全局唯一）",
+    )
     parser.add_argument("--overwrite", action="store_true", help="输出目录已存在时先清空")
     parser.add_argument("--dry-run", action="store_true", help="只打印计划")
     args = parser.parse_args()
@@ -291,6 +365,13 @@ def main() -> int:
         if counts["train"][name] or counts["val"][name]:
             logger.info("%-14s %8d %8d", name, counts["train"][name], counts["val"][name])
 
+    to_convert = sum(not is_png(sample.image) for sample in samples)
+    if to_convert:
+        logger.info(
+            "其中 %d 张不是 PNG，会无损转成 PNG（无法硬链接，占额外磁盘）；其余 %d 张硬链接",
+            to_convert, len(samples) - to_convert,
+        )
+
     if args.dry_run:
         logger.info("--dry-run：未写入任何文件")
         return 0
@@ -301,22 +382,33 @@ def main() -> int:
             return 1
         shutil.rmtree(out_dir)
 
+    renamed = None if args.keep_names else assign_names(samples, names)
     modes: Counter[str] = Counter()
     seen: dict[str, Path] = {}
+    name_rows = []
     for split, items in splits.items():
         for sample in items:
             image = sample.image
-            # 拍平之后不同类别目录下的同名文件会撞车，显式挡住
-            if image.name in seen:
-                logger.error(
-                    "拍平后文件名冲突：%s 与 %s 同名。源数据集的文件名需要全局唯一，"
-                    "用 scripts/export_clusters.py --prefix-parent 重新导出即可",
-                    seen[image.name], image,
+            stem = image.stem if renamed is None else renamed[image]
+            output_name = f"{stem}.png"
+            # 保留原名时，拍平并统一后缀后不同目录下的 a.png 与 a.bmp 会撞成同一个 a.png；
+            # 重新编号时只有类别名仅大小写不同才会撞。按小写比较：macOS 默认文件系统
+            # 不区分大小写，A.png 与 a.png 也会互相覆盖。
+            key = output_name.lower()
+            if key in seen:
+                hint = (
+                    "源数据集的文件名（去掉后缀后）需要全局唯一，"
+                    "去掉 --keep-names 按类别重新编号，"
+                    "或用 scripts/export_clusters.py --prefix-parent 重新导出"
+                    if renamed is None
+                    else "data.yaml 里有只差大小写的类别名，请先改成互不相同"
                 )
+                logger.error("输出文件名冲突：%s 与 %s 都会落成 %s。%s", seen[key], image, output_name, hint)
                 return 1
-            seen[image.name] = image
-            modes[link_or_copy(image, out_dir / "images" / split / image.name)] += 1
-            destination = out_dir / "labels" / split / f"{image.stem}.txt"
+            seen[key] = image
+            modes[materialize_png(image, out_dir / "images" / split / output_name)] += 1
+            name_rows.append((split, output_name, class_of(sample, names), str(image.resolve())))
+            destination = out_dir / "labels" / split / f"{stem}.txt"
             if sample.full_box is None:
                 link_or_copy(sample.label, destination)
             else:
@@ -326,6 +418,12 @@ def main() -> int:
 
     write_data_yaml(out_dir / "data.yaml", names, root=out_dir.resolve(),
                     train="images/train", val="images/val")
+    write_classes_txt(out_dir / "classes.txt", names)
+    # utf-8-sig：带 BOM，Excel / Numbers 直接打开中文源路径不乱码
+    with (out_dir / "name_map.csv").open("w", encoding="utf-8-sig", newline="") as handle:
+        writer = csv.writer(handle)
+        writer.writerow(["split", "name", "class", "source"])
+        writer.writerows(sorted(name_rows, key=lambda row: (row[2], row[1])))
     (out_dir / "summary.json").write_text(
         json.dumps(
             {
@@ -336,6 +434,7 @@ def main() -> int:
                     for group, (policy, count) in sorted(empty_stats.items())
                 },
                 "empty_policy": {"default": default_policy, **per_class_policy},
+                "renamed": renamed is not None,
                 "val_ratio": args.val_ratio,
                 "seed": args.seed,
                 "split_sizes": {k: len(v) for k, v in splits.items()},
@@ -347,7 +446,7 @@ def main() -> int:
         ),
         encoding="utf-8",
     )
-    logger.info("链接方式: %s", dict(modes))
+    logger.info("图片落盘方式: %s（hard=硬链接, copy=跨盘复制, convert=转成 PNG）", dict(modes))
     logger.info("完成 -> %s", out_dir)
     return 0
 

tests/test_prepare_yolo_dataset.py

@@ -1,5 +1,6 @@
 """把 generate_boxes.py 的产出整理成 YOLO 训练集。"""
 
+import csv
 import json
 import sys
 from pathlib import Path
@@ -44,6 +45,15 @@ def source(tmp_path):
     return root
 
 
+def output_of(out, source_stem):
+    """通过 name_map.csv 找源文件对应的输出图片——重命名后只能这么找。"""
+    with (out / "name_map.csv").open(encoding="utf-8-sig", newline="") as handle:
+        for row in csv.DictReader(handle):
+            if Path(row["source"]).stem == source_stem:
+                return out / "images" / row["split"] / row["name"]
+    return None
+
+
 def run(source, out, *extra):
     argv = ["prepare_yolo_dataset.py", "--source", str(source), "--out", str(out), *extra]
     original, sys.argv = sys.argv, argv
@@ -72,8 +82,8 @@ def test_hard_links_share_inode(source, tmp_path):
     """用硬链接而不是复制，不占额外磁盘。"""
     out = tmp_path / "data" / "boxes"
     assert run(source, out) == 0
-    linked = next((out / "images" / "train").iterdir())
-    original = next(p for p in (source / "images").rglob("*.png") if p.name == linked.name)
+    original = source / "images" / "grease" / "grease_0.png"
+    linked = output_of(out, "grease_0")
     assert linked.stat().st_ino == original.stat().st_ino
 
 
@@ -101,8 +111,7 @@ def test_empty_policy_drop_removes_the_image(source, tmp_path):
     summary = json.loads((out / "summary.json").read_text(encoding="utf-8"))
     assert summary["num_images"] == 12
     assert summary["empty_labels"]["normal"]["policy"] == "drop"
-    assert not (out / "labels" / "train" / "normal_0.txt").exists()
-    assert not (out / "images" / "train" / "normal_0.png").exists()
+    assert output_of(out, "normal_0") is None
 
 
 def test_empty_policy_is_per_class(source, tmp_path):
@@ -119,11 +128,8 @@ def test_empty_policy_full_writes_a_whole_image_box(source, tmp_path):
     out = tmp_path / "data" / "boxes"
     assert run(source, out, "--empty-policy", "normal=full") == 0
 
-    label = next(
-        p for split in ("train", "val")
-        for p in (out / "labels" / split).iterdir()
-        if p.stem == "normal_0"
-    )
+    image = output_of(out, "normal_0")
+    label = out / "labels" / image.parent.name / f"{image.stem}.txt"
     assert label.read_text(encoding="utf-8").split() == ["1", "0.5", "0.5", "1.0", "1.0"]
     # 重写而不是硬链接，源标签必须还是空的
     assert (source / "labels" / "normal" / "normal_0.txt").read_text(encoding="utf-8") == ""
@@ -171,12 +177,12 @@ def test_reproducible_split(source, tmp_path):
 
 
 def test_name_collision_after_flattening_is_reported(source, tmp_path, capsys):
-    """不同类别目录下的同名文件，拍平后会互相覆盖——必须报错而不是静默丢数据。"""
+    """保留原名时，不同类别目录下的同名文件拍平后会互相覆盖——必须报错而不是静默丢数据。"""
     duplicate = source / "images" / "normal" / "grease_0.png"
     Image.fromarray(np.zeros((32, 32, 3), dtype=np.uint8)).save(duplicate)
     (source / "labels" / "normal" / "grease_0.txt").write_text("1 0.5 0.5 0.2 0.2\n", encoding="utf-8")
 
-    assert run(source, tmp_path / "data" / "boxes") != 0
+    assert run(source, tmp_path / "data" / "boxes", "--keep-names") != 0
     assert "冲突" in capsys.readouterr().out
 
 
@@ -201,3 +207,183 @@ def test_dry_run_writes_nothing(source, tmp_path):
     out = tmp_path / "data" / "boxes"
     assert run(source, out, "--dry-run") == 0
     assert not out.exists()
+
+
+def _all_outputs(out, kind):
+    return [p for split in ("train", "val") for p in (out / kind / split).iterdir()]
+
+
+def _add_sample(source, group, stem, suffix, class_id, *, fmt=None, mode="RGB"):
+    """往来源目录里加一张指定格式的图 + 一个非空标签。"""
+    size = (32, 24)
+    array = np.random.default_rng(1).integers(0, 255, (size[1], size[0], 3), dtype=np.uint8)
+    image = Image.fromarray(array)
+    if mode != "RGB":
+        image = image.convert(mode)
+    path = source / "images" / group / f"{stem}{suffix}"
+    image.save(path, format=fmt)
+    (source / "labels" / group / f"{stem}.txt").write_text(
+        f"{class_id} 0.5 0.5 0.2 0.2\n", encoding="utf-8"
+    )
+    return path, image
+
+
+def test_all_output_images_are_png(source, tmp_path):
+    """BMP / JPEG 来源都要落成真正的 PNG——后缀和文件头都得是。"""
+    _add_sample(source, "grease", "bmp_img", ".bmp", 0, fmt="BMP")
+    _add_sample(source, "normal", "jpg_img", ".jpg", 1, fmt="JPEG")
+    out = tmp_path / "data" / "boxes"
+    assert run(source, out) == 0
+
+    images = _all_outputs(out, "images")
+    assert len(images) == 15
+    assert {p.suffix for p in images} == {".png"}
+    assert all(pyd.is_png(p) for p in images)
+    # 标签跟着改名后的图片走，一一对应
+    assert sorted(p.stem for p in images) == sorted(p.stem for p in _all_outputs(out, "labels"))
+
+
+def test_bmp_conversion_is_lossless(source, tmp_path):
+    """转换不能缩放或有损压缩，否则归一化的框就不再对应原来的像素。"""
+    _, original = _add_sample(source, "grease", "bmp_img", ".bmp", 0, fmt="BMP")
+    out = tmp_path / "data" / "boxes"
+    assert run(source, out) == 0
+
+    converted = output_of(out, "bmp_img")
+    with Image.open(converted) as image:
+        assert image.size == original.size
+        assert np.array_equal(np.asarray(image), np.asarray(original))
+
+
+def test_png_sources_are_still_hard_linked(source, tmp_path):
+    """只有非 PNG 才转换；PNG 照旧硬链接，不占额外磁盘。"""
+    bmp, _ = _add_sample(source, "grease", "bmp_img", ".bmp", 0, fmt="BMP")
+    out = tmp_path / "data" / "boxes"
+    assert run(source, out) == 0
+
+    summary = json.loads((out / "summary.json").read_text(encoding="utf-8"))
+    assert summary["link_modes"] == {"hard": 13, "convert": 1}
+    converted = output_of(out, "bmp_img")
+    assert converted.stat().st_ino != bmp.stat().st_ino
+    assert bmp.read_bytes()[:2] == b"BM"      # 源文件没被动过
+
+
+def test_png_suffix_with_non_png_content_is_converted(source, tmp_path):
+    """按文件头判断而不是后缀：写着 .png 其实是 JPEG 的也要转。"""
+    fake, _ = _add_sample(source, "grease", "fake", ".png", 0, fmt="JPEG")
+    assert not pyd.is_png(fake)
+    out = tmp_path / "data" / "boxes"
+    assert run(source, out) == 0
+    output = output_of(out, "fake")
+    assert pyd.is_png(output)
+
+
+@pytest.mark.parametrize("mode", ["L", "RGBA", "CMYK"])
+def test_conversion_handles_pixel_modes(source, tmp_path, mode):
+    """灰度 / 带透明度原样保留；PNG 存不下的 CMYK 转成 RGB。"""
+    _add_sample(source, "grease", "moded", ".tif", 0, fmt="TIFF", mode=mode)
+    out = tmp_path / "data" / "boxes"
+    assert run(source, out) == 0
+    output = output_of(out, "moded")
+    with Image.open(output) as image:
+        assert image.format == "PNG"
+        assert image.mode == ("RGB" if mode == "CMYK" else mode)
+
+
+def test_same_stem_different_suffix_collides(source, tmp_path, capsys):
+    """grease_0.png 与另一目录的 grease_0.bmp 统一后缀后会撞成同一个文件，必须报错。"""
+    _add_sample(source, "normal", "grease_0", ".bmp", 1, fmt="BMP")
+    assert run(source, tmp_path / "data" / "boxes", "--keep-names") != 0
+    assert "冲突" in capsys.readouterr().out
+
+
+def test_dry_run_reports_conversion_count(source, tmp_path, capsys):
+    _add_sample(source, "grease", "bmp_img", ".bmp", 0, fmt="BMP")
+    assert run(source, tmp_path / "out", "--dry-run") == 0
+    assert "1 张不是 PNG" in capsys.readouterr().out
+
+
+def test_classes_txt_matches_data_yaml(source, tmp_path):
+    """classes.txt 的行号就是 class_id，必须与 data.yaml 的 names 严格一致。"""
+    out = tmp_path / "data" / "boxes"
+    assert run(source, out) == 0
+
+    lines = (out / "classes.txt").read_text(encoding="utf-8").splitlines()
+    meta = yaml.safe_load((out / "data.yaml").read_text(encoding="utf-8"))
+    assert lines == CLASSES
+    assert lines == [meta["names"][i] for i in range(meta["nc"])]
+    assert (out / "classes.txt").read_text(encoding="utf-8").endswith("\n")
+
+
+def test_classes_txt_rejects_names_that_break_line_numbering(tmp_path):
+    from datasets.yolo import write_classes_txt
+
+    with pytest.raises(ValueError, match="换行"):
+        write_classes_txt(tmp_path / "classes.txt", ["ok", "bad\nname"])
+    with pytest.raises(ValueError, match="为空"):
+        write_classes_txt(tmp_path / "classes.txt", ["ok", "  "])
+
+
+def _stems(out):
+    return sorted(p.stem for p in _all_outputs(out, "images"))
+
+
+def test_files_renamed_by_class(source, tmp_path):
+    """默认按 <类别>_<序号> 重新编号，序号在类内从 1 连续编到该类总数。"""
+    out = tmp_path / "data" / "boxes"
+    assert run(source, out) == 0
+    assert _stems(out) == (
+        [f"grease_{i:04d}" for i in range(1, 7)]
+        + [f"normal_{i:04d}" for i in range(1, 6)]
+        + [f"whitedot_{i:04d}" for i in range(1, 3)]
+    )
+    assert _stems(out) == sorted(p.stem for p in _all_outputs(out, "labels"))
+
+
+def test_renamed_file_class_matches_its_label(source, tmp_path):
+    """文件名里的类别必须与标签第一列一致，否则改名反倒制造了误导。"""
+    out = tmp_path / "data" / "boxes"
+    assert run(source, out) == 0
+    for label in _all_outputs(out, "labels"):
+        text = label.read_text(encoding="utf-8").split()
+        if text:
+            assert label.stem.rsplit("_", 1)[0] == CLASSES[int(text[0])]
+
+
+def test_name_map_traces_back_to_source(source, tmp_path):
+    """name_map.csv 覆盖每一张输出，且源路径真实存在、内容一致。"""
+    out = tmp_path / "data" / "boxes"
+    assert run(source, out) == 0
+    with (out / "name_map.csv").open(encoding="utf-8-sig", newline="") as handle:
+        rows = list(csv.DictReader(handle))
+    assert len(rows) == 13
+    for row in rows:
+        output = out / "images" / row["split"] / row["name"]
+        assert output.read_bytes() == Path(row["source"]).read_bytes()
+        assert row["name"].startswith(row["class"] + "_")
+
+
+def test_names_stable_across_different_splits(source, tmp_path):
+    """序号与划分无关：换种子重跑，同一张源图拿到同一个名字。"""
+    first, second = tmp_path / "a", tmp_path / "b"
+    assert run(source, first, "--seed", "1") == 0
+    assert run(source, second, "--seed", "2") == 0
+    for stem in ("grease_0", "grease_5", "normal_3", "whitedot_1"):
+        assert output_of(first, stem).name == output_of(second, stem).name
+
+
+def test_keep_names_preserves_source_stems(source, tmp_path):
+    """--keep-names 保留原名，只是后缀统一成 .png。"""
+    _add_sample(source, "grease", "原名_中文", ".bmp", 0, fmt="BMP")
+    out = tmp_path / "data" / "boxes"
+    assert run(source, out, "--keep-names") == 0
+    assert "原名_中文" in _stems(out)
+    assert output_of(out, "原名_中文").name == "原名_中文.png"
+
+
+def test_kept_empty_labels_named_after_source_folder(source, tmp_path):
+    """空标签没有 class_id，按来源目录名编号；与同类有框的图共用序号，不会撞名。"""
+    out = tmp_path / "data" / "boxes"
+    assert run(source, out) == 0
+    assert output_of(out, "normal_0").stem.startswith("normal_")
+    assert len([s for s in _stems(out) if s.startswith("normal_")]) == 5