film op• Data kinds: images → table
• Call: import fullseye as fs; fs.ledger.film_thickness_map(images, wavelengths_nm=(450.0, 500.0, 550.0, 600.0, 650.0, 700.0), film='SIO2', substrate='SI', thickness_min_nm=0.0, thickness_max_nm=1500.0, mode='spectral', under=(), ambiguity_rms=0.01, step_nm=1.0, normalize=False, chunk=4096) (to call the implementation directly, import filmoptics; filmoptics.film_thickness_map(images, wavelengths_nm=(450.0, 500.0, 550.0, 600.0, 650.0, 700.0), film='SIO2', substrate='SI', thickness_min_nm=0.0, thickness_max_nm=1500.0, mode='spectral', under=(), ambiguity_rms=0.01, step_nm=1.0, normalize=False, chunk=4096); from the registry, opsoptics.get("film_thickness_map"))
Per-pixel film thickness from a spectral image (reflectance per band) or an RGB image (look-up table plus parabolic refinement).
> The detailed description below is the original text — the summary and the headings are translated.
images: (B, H, W) の帯域画像の列。mode="spectral" なら各帯域は wavelengths_nm の波長での
反射率(狭帯域の分光カメラ)、mode="srgb" なら B = 3 で film_color と同じ
線形 sRGB(D65・CIE 1931 の等色関数、Luther 条件を満たす理想の RGB カメラ)。
wavelengths_nm: 分光モードの帯域の中心 [nm] (B 個、昇順)。srgb モードでは使わない。film / substrate / under: 積層(材料表の鍵)。最上層 film の厚さを求める。thickness_min_nm / thickness_max_nm / step_nm: 早見表の膜厚の範囲と刻み。
ambiguity_rms: 「同じくらい合う候補」の閾: 画素の RMS 残差が最良 + この値以下の局所解を数える。
既定 0.01 は反射率 1 % の雑音の目安。
normalize: True なら画素と早見表をどちらも長さ 1 に揃えてから比べる(明るさ = 照明・露出・反射率の倍率が
分からないときに、色の向き(分光の形)だけで照合する)。rmse は長さ 1 の単位になる。
chunk: 1 回に照合する画素の数(メモリの上限)。
返り値 dict: thickness (H, W) / rmse (H, W) / n_candidates (H, W)(閾の中に入った局所解の数。
★1 より大きい画素は色(帯域)だけでは膜厚が決まらない —— RGB では色が膜厚について周期的に繰り返すので
ここが 2 以上になる)/ lut_thickness_nm(早見表の膜厚)。
Every optics op validates its input before computing (nothing slips through silently):
• Units are baked into the argument name — _mm / _um / _deg / _mrad. Confusing mm with µm does not crash; it yields a plausible-looking wrong answer, so the name prevents it. Nothing here guesses the unit from the magnitude.
• Strings raise ValueError — float('50') succeeds, so an unparsed configuration value would slip through as a length (measured: thin_lens('50', '200') returned a plausible 66.667 mm). bool is refused too, as the implicit promotion True == 1.
• complex / masked arrays raise ValueError (real-valued slots only; silently dropping the imaginary part or peeling off the mask is refused). NaN/Inf raises ValueError on every input.
• Division by zero and its relatives are refused by name: focal length 0, radius of curvature 0, refractive index <= 0, a fully opaque aperture (all zeros, so the normalisation is 0/0), a PSF whose sum is <= 0, a Stokes vector with S0 = 0, and an object sitting at the front focal point (the image is at infinity).
• Only two ops return a non-finite value, and both state it as a contract: depth_of_field returns far_mm = inf beyond the hyperfocal distance (that is what the hyperfocal distance means), and gaussian_beam returns wavefront_radius_mm = inf at the waist (the radius of curvature of a plane wavefront). Both also return a finite companion (far_is_infinite / curvature_per_mm). Any other silent NaN/Inf is detected internally and raises ValueError — "float64 overflowed" and "the answer is infinite" are different claims, so the first is never returned wearing the face of the second.
• Size caps: generated grids are capped by optics.MAX_GRID (4096); supplied fields/PSFs/apertures by optics.MAX_FIELD_ELEMENTS (2^24); ABCD element chains by optics.MAX_SYSTEM_ELEMENTS (1024); Zernike by MAX_ZERNIKE_TERMS (512) / MAX_ZERNIKE_ORDER (40) / MAX_ZERNIKE_BASIS (2^25). This closes, fail-closed, the paths where a small argument triggers a huge internal allocation (measured: n_max=40 × 4096² needs 108 GB).
• Physically impossible states are refused too: a Stokes vector with degree of polarisation > 1, negative transmittance, negative intensity, and invalid Zernike indices such as n-|m| odd.
• 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.
• The canonical algorithm (author, year) and its uses are named in the family usage guide above.
• poc_thin_film_reflectometry — py -3.11 examples/poc_thin_film_reflectometry.py
table as input)abcd_matrix · wavefront_stats · sfr_from_edge · paraxial_trace · seidel_coefficients · spot_stats · tolerance_analysis · wavefront_from_opd
film)multilayer_reflectance · film_color · film_thickness_fft · film_thickness_fit
*Provenance: filmoptics.py — OPTICS operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.