tcspc op• 数据种类:无 → counts(仅由参数决定的算子 —— 不接受图像或数据输入)
• 调用:import photoncount; photoncount.tcspc_simulate(distance_m=3.0, bins=256, bin_ps=100.0, signal_photons=50.0, ambient_photons=20.0, irf_fwhm_ps=200.0, seed=0, noise=True)(或 opsphoton.get("tcspc_simulate"))
合成答案已知的单像素光子到达时间直方图。
> 以下的详细说明为原文 —— 摘要与标题已翻译。
The generative model of a direct time-of-flight (dToF) / TCSPC measurement::
lambda_k = signal_photons * P(pulse in bin k) + ambient_photons / bins
N_k ~ Poisson(lambda_k)
where the pulse is a Gaussian of full width at half maximum *irf_fwhm_ps*
centred at the round-trip time `t0 = 2*distance_m/c, and `P(pulse in bin
k)`` is its exact integral over the bin (an erf difference, not a
midpoint sample) — so with `noise=False` the returned histogram is an
analytic ground truth, not an approximation of one. *ambient_photons* is the
total background (sunlight, dark counts) spread uniformly over the window.
`noise=False returns lambda_k itself (no sampling); noise=True`
draws one Poisson realisation from `numpy.random.default_rng(seed)`.
Returns a float64 1-D histogram of length *bins*. The unambiguous range is
`c * bins * bin_ps / 2` — 3.84 m at the defaults (256 bins x 100 ps), with
a bin resolution of 1.50 cm.
The pulse is not renormalised to the window: a target near the far edge
genuinely loses the tail of its pulse, exactly as a real sensor does, and the
total signal comes back slightly below *signal_photons*. Renormalising would
have made the truncated pulse asymmetric and biased its centroid.
Raises `ValueError`: a non-positive *distance_m*, a *bins* outside
`[2, MAX_BINS]`, a non-positive *bin_ps* / *irf_fwhm_ps*, negative photon
budgets, a non-integer or negative *seed*, a non-bool *noise*, and — instead
of wrapping the pulse silently to a short distance — a *distance_m* whose
round-trip time falls outside the `bins * bin_ps` window.
• 示例数据目录(下载 URL / 许可证) —— 2-D 用 skimage.data(BSD/公有领域)加合成图,3-D 给出真实数据源(Stanford/PDS 等)的下载 URL。
• 算子来历与参考文献 —— 该算子族所依据的研究/方法出处。
• 算法的正典(作者・年份)与用途见上面的族使用指南。
• photon_timeresolved — py -3.11 examples/photon_timeresolved.py
counts 作为输入)tcspc_coates_correct · tcspc_irf_convolve · tcspc_background_subtract · tcspc_stats · dtof_depth · lifetime_fit · lifetime_phasor
tcspc)tcspc_irf_convolve · tcspc_background_subtract · tcspc_stats
*Provenance: photoncount.py — PHOTON 算子登记表。本条目由 tools/opdocs.py md 自动生成(请勿手工编辑)。*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.