polarization op• 数据种类:polsweep → image2d
• 调用:import specularity; specularity.polarization_dolp_map(images, angles_deg=(0.0, 45.0, 90.0, 135.0), max_violation_frac=0.0)(或 opsspecular.get("polarization_dolp_map"))
逐像素的线偏振度。→ [0, 1] 的 (H, W)。
> 以下的详细说明为原文 —— 摘要与标题已翻译。
`sqrt(S1^2 + S2^2) / S0`, from the same sinusoid fit as
:func:polarization_separate. It answers the question that decides whether
a polariser is worth mounting at all: 1 means the light at that pixel is
fully linearly polarised and a crossed analyser extinguishes it completely,
0 means the polariser will only cost you a stop of exposure.
Being a ratio, it is invariant to exposure: scaling every frame by 1e-4,
1e4 or 1e8 moves it by at most 3.9e-16 (measured), which is what makes it
comparable across a production line where the lamps age. Not *bit*-
identical — the least-squares fit rounds differently at a different scale —
and the difference between "invariant" and "bit-identical" is the kind of
claim this library measures rather than asserts.
Pixels with zero total radiance have no degree of polarisation (every ratio
would be 0/0) and are returned as 0.0 rather than as NaN; that is a
convention, and it is stated here because a NaN spreading into a
thresholding routine is exactly the silent failure this library refuses.
Raises `ValueError: as :func:polarization_separate`.
• 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。
• specular_photometric — py -3.11 examples/specular_photometric.py
image2d 作为输入)polarization)polarization_render · polarization_separate · polarization_stokes
*Provenance: specularity.py — SPECULAR 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.