Shaun ZhouandClaude Opus 5
2a92275317
产线要求送进模型的图固定为 N×N 且不许 resize——缺陷的绝对尺度是判别依据， 拉伸会把"5 像素的黑点"变成别的东西。 - engine/tiling.py：切片几何。边长 < N 镜像填充（reflect，真镜像，原图居中）； 边长 >= N 按步长裁剪、末片贴边保证全覆盖。框跟着平移裁剪，露出面积低于 min_visibility 的丢弃；to_source 反向映射供推理时拼回原图。 - scripts/tile_dataset.py：整套数据集转换。有框图切出的空片会爆量 （524x959 能切 24 片），用 --max-empty-ratio 限量；原本无框的真负样本不受限。 - 训练配置 imgsz 改 160，并显式关掉 scale 与 translate——ultralytics 的默认值是 0.5 / 0.1 而不是 0，不写出来等于一直在做仿射缩放，违反约束。 尺寸正好等于 imgsz 时 letterbox 退化为空操作（r=1、dw=dh=0），核对过源码。 合成数据上验证：所有片正好 160x160、框区域与原图逐像素一致、填充是真镜像。 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
187 lines
6.9 KiB
Python
187 lines
6.9 KiB
Python
"""固定边长切片：只裁剪与镜像填充，不缩放。"""
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import pytest
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np = pytest.importorskip("numpy")
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from engine.detection import Box, from_yolo # noqa: E402
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from engine.tiling import axis_starts, cut, plan_tiles, remap_boxes, to_source # noqa: E402
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SIZE = 160
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# ---------------- 切片网格 ----------------
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@pytest.mark.parametrize(
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"length,overlap,expected",
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[
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(160, 0, [0]), # 正好一片
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(128, 0, [0]), # 不足，填充
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(320, 0, [0, 160]), # 整两片
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(200, 0, [0, 40]), # 最后一片贴边，与前片重叠 120
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(480, 32, [0, 128, 256, 320]), # 步长 128，末片贴边
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],
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)
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def test_axis_starts(length, overlap, expected):
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assert axis_starts(length, SIZE, overlap) == expected
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def test_last_tile_always_reaches_the_edge():
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"""末尾那条不足一步的区域不能被漏掉。"""
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for length in range(161, 700):
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starts = axis_starts(length, SIZE, 16)
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assert starts[-1] + SIZE == length
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def test_plan_tiles_covers_a_large_image():
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tiles = plan_tiles(524, 959, SIZE, overlap=0)
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assert len(tiles) == len(axis_starts(524, SIZE, 0)) * len(axis_starts(959, SIZE, 0))
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assert all(t.pad_left == 0 and t.pad_top == 0 for t in tiles) # 大图纯裁剪
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def test_small_image_is_centred_and_padded():
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tile, = plan_tiles(116, 83, SIZE)
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assert (tile.crop_width, tile.crop_height) == (116, 83)
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assert tile.pad_left == (160 - 116) // 2 == 22
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assert tile.pad_top == (160 - 83) // 2 == 38
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@pytest.mark.parametrize("bad", [0, -1])
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def test_rejects_invalid_size(bad):
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with pytest.raises(ValueError, match="size"):
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plan_tiles(100, 100, bad)
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@pytest.mark.parametrize("bad", [-1, 160, 200])
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def test_rejects_invalid_overlap(bad):
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with pytest.raises(ValueError, match="overlap"):
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plan_tiles(300, 300, SIZE, bad)
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# ---------------- 取片 ----------------
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def test_cut_crops_without_resizing():
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"""大图取片必须是原像素的子块，一个插值都不能有。"""
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image = np.arange(300 * 400, dtype=np.uint8).reshape(300, 400) % 251
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tile = plan_tiles(400, 300, SIZE, overlap=0)[1] # 第二片，x 有偏移
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patch = cut(image, tile, SIZE)
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assert patch.shape == (SIZE, SIZE)
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expected = image[tile.y:tile.y + SIZE, tile.x:tile.x + SIZE]
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assert np.array_equal(patch, expected)
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def test_cut_mirrors_small_images():
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image = np.arange(1, 5, dtype=np.uint8).reshape(1, 4) # 1x4
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tile, = plan_tiles(4, 1, 4)
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patch = cut(image, tile, 4)
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assert patch.shape == (4, 4)
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# 竖直方向镜像：原始那一行在中间，上下是它的倒影（reflect 不重复边缘行）
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assert np.array_equal(patch[tile.pad_top], image[0])
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assert patch.dtype == image.dtype
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def test_cut_keeps_channels():
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image = np.zeros((50, 60, 3), dtype=np.uint8)
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tile, = plan_tiles(60, 50, SIZE)
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assert cut(image, tile, SIZE).shape == (SIZE, SIZE, 3)
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def test_cut_of_an_exact_size_image_is_the_image_itself():
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image = np.random.default_rng(0).integers(0, 255, (SIZE, SIZE), dtype=np.uint8)
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tile, = plan_tiles(SIZE, SIZE, SIZE)
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assert np.array_equal(cut(image, tile, SIZE), image)
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# ---------------- 框的重映射 ----------------
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def test_box_shifts_with_padding():
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"""小图居中填充后，框只是整体平移。"""
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width, height = 80, 80
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box = from_yolo(3, 0.5, 0.5, 0.25, 0.25) # 原图中心 20x20 的框
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tile, = plan_tiles(width, height, SIZE)
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mapped, = remap_boxes([box], tile, width, height, SIZE)
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assert mapped.class_id == 3
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# 原图中心落在片中心
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assert (mapped.x1 + mapped.x2) / 2 == pytest.approx(0.5)
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# 尺寸不变：原来 20 像素，片上还是 20 像素（占 160 的 1/8）
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assert (mapped.x2 - mapped.x1) * SIZE == pytest.approx(20)
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def test_box_outside_the_tile_is_dropped():
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width = height = 400
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box = from_yolo(0, 0.9, 0.9, 0.05, 0.05) # 右下角
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first = plan_tiles(width, height, SIZE, overlap=0)[0] # 左上片
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assert remap_boxes([box], first, width, height, SIZE) == []
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def test_partially_visible_box_is_clipped_or_dropped():
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"""跨片的框：露得多就裁剪保留，露得少就丢弃。"""
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width = height = 320
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# 框中心正好在 x=160 的切割线上，左右各露一半
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box = from_yolo(1, 160 / width, 0.25, 40 / width, 40 / height)
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left, right = plan_tiles(width, height, SIZE, overlap=0)[:2]
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kept_left, = remap_boxes([box], left, width, height, SIZE, min_visibility=0.4)
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assert kept_left.x2 == pytest.approx(1.0) # 裁到片的右边缘
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assert (kept_left.x2 - kept_left.x1) * SIZE == pytest.approx(20)
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# 阈值提到 0.6 时，只露一半就不够了
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assert remap_boxes([box], left, width, height, SIZE, min_visibility=0.6) == []
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assert remap_boxes([box], right, width, height, SIZE, min_visibility=0.6) == []
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def test_mirrored_region_gets_no_box():
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"""镜像出来的是复制品，不能再给它标框——否则等于告诉模型那里真有缺陷。"""
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width = height = 80
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box = from_yolo(0, 0.5, 0.5, 0.5, 0.5)
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tile, = plan_tiles(width, height, SIZE)
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mapped = remap_boxes([box], tile, width, height, SIZE)
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assert len(mapped) == 1 # 只有一个，不是四个倒影
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# 框整体落在原图内容的范围内
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assert mapped[0].x1 * SIZE >= tile.pad_left - 1e-6
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assert mapped[0].x2 * SIZE <= tile.pad_left + tile.crop_width + 1e-6
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def test_zero_area_box_is_ignored():
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tile, = plan_tiles(100, 100, SIZE)
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degenerate = Box(0, 0.5, 0.5, 0.5, 0.5)
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assert remap_boxes([degenerate], tile, 100, 100, SIZE) == []
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# ---------------- 反向映射 ----------------
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@pytest.mark.parametrize("size_wh", [(80, 60), (400, 300), (160, 160), (524, 959)])
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def test_round_trip_back_to_source(size_wh):
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"""片上的框映射回原图，必须落回原来的像素位置。
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框放在某一片裁剪区域的正中，确保它完整落在该片内——无重叠切片时，
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原图正中的框反而可能横跨切割线，不适合用来做往返校验。
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"""
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width, height = size_wh
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for tile in plan_tiles(width, height, SIZE, overlap=0):
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cx = tile.x + tile.crop_width / 2
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cy = tile.y + tile.crop_height / 2
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half_w = min(tile.crop_width, 20) / 4
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half_h = min(tile.crop_height, 20) / 4
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px = [cx - half_w, cy - half_h, cx + half_w, cy + half_h]
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box = Box(2, px[0] / width, px[1] / height, px[2] / width, px[3] / height)
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mapped, = remap_boxes([box], tile, width, height, SIZE, min_visibility=0.99)
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back = to_source(mapped, tile, SIZE)
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assert [back.x1, back.y1, back.x2, back.y2] == pytest.approx(px, abs=1e-6)
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def test_score_survives_both_directions():
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tile, = plan_tiles(100, 100, SIZE)
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box = Box(1, 0.4, 0.4, 0.6, 0.6, 0.83)
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mapped, = remap_boxes([box], tile, 100, 100, SIZE)
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assert mapped.score == 0.83
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assert to_source(mapped, tile, SIZE).score == 0.83
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