polarization oppolsweep → image2dimport fullseye as fs; fs.ledger.polarization_dolp_map(images, angles_deg=(0.0, 45.0, 90.0, 135.0), max_violation_frac=0.0) (実装を直接呼ぶなら import specularity; specularity.polarization_dolp_map(images, angles_deg=(0.0, 45.0, 90.0, 135.0), max_violation_frac=0.0)、台帳から引くなら opsspecular.get("polarization_dolp_map"))Degree of linear polarisation, per pixel. → (H, W) in [0, 1].
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.
py -3.11 examples/poc_polarization_specular.pypy -3.11 examples/specular_photometric.pyimage2d を入力に取れる)polarization)polarization_render · polarization_separate · polarization_stokes
Provenance: specularity.py — SPECULAR 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)。
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.