tb_cutout — 2D `typed` op

• Data kinds: points → points

• Call: fullseye.apply(img, "tb_cutout", a=0.5, b=0.5) (the 2-D model is one image plus two scalar knobs a,b∈[0,1])

tb_cutout: input → output

*The figure is the actual output on a synthetic 128×128 input. Left: input, right: output. Point clouds are drawn as a top-down scatter (brightness = z), 1-D series as a line plot, volumes as the maximum-intensity projection along z, videos as the middle frame, complex images as magnitude; return values that are not pictures are shown as the values themselves.*

*Knob a does not change the output (measured: identical at 0.1 / 0.5 / 0.9).*

*Knob b does not change the output (measured: identical at 0.1 / 0.5 / 0.9).*

Stages (the ops that come before → this op, left to right):

▸ tb_cutout: stages (docs site)

On other images (synthetic scene / photo / coins. Top row: inputs, bottom row: their outputs. Knobs at default):

▸ tb_cutout: other inputs (docs site)

Usage

Removes a spatial axis-aligned box region and returns `(kept, kept_idx)` (mimicking localized missing data).

> The detailed description below is the original text — the summary and the headings are translated.

既存の点を 1 つ一様サンプルして中心とし、辺長 `extent`(スカラ=立方体, または

`(3,)`=各軸辺長)のボックス内の点をすべて除去する。中心点自身が必ず入るため

最低 1 点は除去される。除去点は必ず辺長 `extent` のボックスに収まる(空間的に

局所的 = ランダム散布とは判別可能)。`kept == points[kept_idx]、extent > 0`。

`extent に正でない値や (3,) 以外の形を渡すと ValueError`。空入力は空と空

インデックスを返す。中心は `rng.integers(n) で選ぶ点なので、seed` が同じでも点の

並びが変わると別の場所が抜ける。ボックス判定は `|P - center| <= extent/2` の閉区間。

除去点数は密度次第で、`extent` を雲の大きさより大きくすると全点が消える。返り値は

`(kept float64 (M,3), kept_idx int64 (M,))`、順序は元のまま。一様な欠損は

`random_dropout`。

2-D 進化レジストリへ橋渡しした 3d の op `cutout。実装は同じで、呼び出し規約だけ op(v, a, b) に合わせてある。この op に調整点は無く、a も b` も使われない。

References (sample data, literature)

• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).

• Operator provenance and references — the sources of the research/methods this op family came from.

Try it in Studio

The program below has been verified to run (same input as the figure). In Studio's help this block becomes buttons that load and run it on the spot.

img_to_points 0.50 0.50
tb_cutout 0.50 0.50

▸ Load this pipeline · Load & run

Runnable examples (verified samples that actually call this op)

The examples below call the underlying ledger op cutout. This bridge op is the same implementation adapted to the fn(v, a, b) convention, so the behaviour carries over unchanged (only the call form differs).

• sensor_seg — py -3.11 examples_3d/sensor_seg.py

Ops the type connects to (they accept `points` as input)

identity · tb_points_to_voxel · tb_estimate_point_normals · tb_iss_keypoints · tb_project_points · tb_render_point_depth · tb_statistical_outlier_removal · tb_radius_outlier_removal

Same category (`typed`)

tb_points_to_voxel · tb_estimate_point_normals · tb_iss_keypoints · tb_project_points · tb_render_point_depth · tb_statistical_outlier_removal · tb_radius_outlier_removal · tb_voxel_grid_downsample

*Provenance: ops.py — 2D operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*

tb_cutout — 2D typed op