sensorchar op• Data kinds: signal × signal → table
• Call: import fullseye as fs; fs.ledger.emva_ptc_linearity_check(mu_y, var_y, mu_y_dark, var_y_dark, mu_y_sat, n_intervals=6, limit=0.03) (to call the implementation directly, import sensorchar; sensorchar.emva_ptc_linearity_check(mu_y, var_y, mu_y_dark, var_y_dark, mu_y_sat, n_intervals=6, limit=0.03); from the registry, opsoptics.get("emva_ptc_linearity_check"))
Is the photon transfer curve straight (section 6.6, Eq. 51)? The check for whether the Linear K may be used.
> The detailed description below is the original text — the summary and the headings are translated.
式 (50) の K(0〜70 % の直線当てはめの傾き)と、同じ点に当てた 3 次 B-スプライン(General の式 44〜49)の各点の局所の傾き K_i を比べ、相対偏差の大きさ |K_i − K|/K の平均が *limit*(3 %)未満なら線形モデルを使ってよい。満たさなければ General で評価せよ、と規格は書く。★本文は「相対偏差の大きさの平均」と文で書き、式 (51) は 1/n の無い和で印刷されている。判定は平均、和も返す。区間の数は Linear の本文に無い —— 既定 6 は General の「6〜8 区間」の下端(0〜70 % の点だけに当てるので少なめ)。
返り値 {"K", "K_local", "x", "mean_rel_dev", "sum_rel_dev", "limit", "linear_model_ok", "n_points", "n_intervals"}。
Raises ValueError: emva_photon_transfer と emva_bspline_regression の拒否 / limit が正でない。
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_emva1288_in_camera_processing — py -3.11 examples/poc_emva1288_in_camera_processing.py
• poc_emva1288_sensor — py -3.11 examples/poc_emva1288_sensor.py
table as input)abcd_matrix · wavefront_stats · sfr_from_edge · paraxial_trace · seidel_coefficients · spot_stats · tolerance_analysis · wavefront_from_opd
sensorchar)emva_pair_statistics · emva_photon_transfer · emva_quantum_efficiency · emva_linearity_error · emva_snr_curve · emva_sensitivity_threshold · emva_dynamic_range · emva_dark_current
*Provenance: sensorchar.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.