dtof_cube_simulate — PHOTON `dtof` op

• データ種: depth → histcube

• 呼び出し: import photoncount; photoncount.dtof_cube_simulate(depth, bins=256, bin_ps=100.0, reflectivity=None, signal_photons=20.0, ambient_photons=5.0, irf_fwhm_ps=200.0, seed=0, noise=True) (または opsphoton.get("dtof_cube_simulate"))

使い方

Synthesise the `(H, W, T)` photon histogram cube a SPAD array produces.

The per-pixel version of :func:tcspc_simulate: every pixel of the *depth*

map (metres, one-way distance) gets a Gaussian return at its own round-trip

time `2d/c`, scaled by *signal_photons* times that pixel's *reflectivity*,

on a uniform ambient pedestal of `ambient_photons/bins` per bin, Poisson

sampled with `numpy.random.default_rng(seed)`.

The output is the cube that :func:dtof_cube_depth inverts, and the axis

order is (H, W, T) with time LAST — the same layout a SPAD array streams.

That is not the `(D, H, W) of a :mod:volops` voxel volume; the two are

both 3-D float arrays and swapping them silently produces a plausible-wrong

depth map, which is why :func:dtof_cube_depth checks and says so.

`noise=False` returns the exact expectation cube (no sampling).

Ground truth: with `noise=False` the per-pixel centroid of the cube returns

the input depth map to an RMS error of 3.2e-16 m (pinned in the tests) — the

pulse integral is analytic, so the only error is float round-off.

Raises `ValueError`: a non-2-D, non-finite or non-positive *depth*, a

*reflectivity* that is negative or not the same shape as *depth*, a *bins*

outside `[2, MAX_BINS]`, non-positive *bin_ps* / *irf_fwhm_ps*, negative

photon budgets, a non-integer *seed*, a cube over

:data:MAX_CUBE_ELEMENTS (`H*W*bins` grows fast — 512x512x256 is 8x the

cap), and any depth whose round-trip time falls outside the time window

(which a real sensor would alias into a short distance).

詳しい使い方ガイド

• photon_timeresolved ファミリガイド

参考(サンプルデータ・文献)

• サンプルデータカタログ(DL URL / ライセンス) — 2-D は skimage.data(BSD/public)+ 合成、3-D は実データ源(Stanford/PDS 等)の DL URL。

• 演算子の来歴・参考文献 — この op 族の元になった研究/手法の出典。

• アルゴリズムの正典(著者・年)と用途は上記ファミリ使い方ガイドに記載。

実行できる例(この op を実際に呼ぶ検証済みサンプル)

• photon_timeresolved — py -3.11 examples/photon_timeresolved.py

• poc_dtof_ranging — py -3.11 examples/poc_dtof_ranging.py

型が繋がる次の op(`histcube` を入力に取れる)

dtof_cube_depth

同カテゴリ(`dtof`)

dtof_depth · dtof_cube_depth

*Provenance: photoncount.py — PHOTON operator registry. この per-op ノートは tools/opdocs.py md が自動生成(手編集しない)。*

dtof_cube_simulate — PHOTON dtof op

使い方