watermedia oprgbimage × image2d × image2d → tableimport fullseye as fs; fs.ledger.underwater_image(image, depth_map_m, distance_map_m, water_type='jerlov_I', wavelengths_um=None, illumination='daylight', backscatter=True, apply_ambient=False, beta_b_ratio=1.0, backscatter_ratio=0.02) -> 'dict' (実装を直接呼ぶなら import watermedia; watermedia.underwater_image(image, depth_map_m, distance_map_m, water_type='jerlov_I', wavelengths_um=None, illumination='daylight', backscatter=True, apply_ambient=False, beta_b_ratio=1.0, backscatter_ratio=0.02) -> 'dict'、台帳から引くなら opsoptics.get("underwater_image"))The image of a scene recorded through water (revised Jaffe-McGlamery model) -> dict.
Following Akkaynak & Treibitz (2018) the recorded image is I = J exp(-beta_D r) + B_inf (1 - exp(-beta_B r)): the
direct signal J of the object attenuated along the camera-object distance r with a wavelength-dependent
coefficient, plus backscatter, the veiling light B_inf that builds up along the same path with its own coefficient.
image is (H, W, K), non-negative: the appearance of the object at zero distance, per band (K = 3 is RGB with the
effective wavelengths 0.61 / 0.54 / 0.465 um, other K need wavelengths_um). depth_map_m is the depth of the scene below the surface and
distance_map_m the distance to the camera, each (H, W) or a scalar. beta_D is the diffuse attenuation Kd of
:func:water_attenuation (used as the attenuation along the line of sight, an approximation that Akkaynak & Treibitz
show to depend on range) and beta_B = beta_b_ratio beta_D. The veiling light is the single-scattering value
B_inf = E(z) b_b / (2 c) with b_b = backscatter_ratio b and E(z) = E_0 exp(-Kd z) the daylight left at the depth (an assumption, not a
measurement). illumination is "daylight" (flat relative spectrum 1) or a (K,) relative spectrum at the surface.
With apply_ambient the object is also dimmed by the ambient light at its depth, J = image E(z); without it image is
taken as it already is at the object, so that distance 0 returns it exactly. backscatter=False leaves pure Beer-Lambert.
The table has image (the recording), direct, backscatter, transmission (exp(-beta_D r)),
beta_D, beta_B, veiling_light (H, W, K), ambient (E(z)/E_0), wavelengths_um and, for RGB, red_to_blue_kd_ratio.
Non-finite or negative inputs are refused.
optics の全 op は入力を検証してから計算する(黙って通さない):
_mm / _um / _deg / _mrad。mm と µm の取り違えは crash ではなく「もっともらしく間違った答え」なので、名前で防ぐ。大きさから単位を推測する処理は一切しない。ValueError — float('50') は成功してしまうため、未パースの設定値が長さとして通り抜ける(実測: thin_lens('50', '200') がもっともらしい 66.667 mm を返していた)。bool も True == 1 の暗黙昇格として拒否。ValueError(実数枠のみ。虚部の無言切り捨て・マスク剥がしを拒否)。NaN/Inf は全入力で ValueError。depth_of_field の過焦点距離以遠の far_mm = inf(それが過焦点距離の定義)と gaussian_beam のウエストでの wavefront_radius_mm = inf(平面波面の曲率半径)。どちらも有限の相棒(far_is_infinite / curvature_per_mm)を併せて返す。それ以外の無言 NaN/Inf は内部で検出して ValueError —「float64 が溢れた」と「答えが無限大」は別の主張なので、後者の顔で前者を返さない。optics.MAX_GRID(4096)、供給された場/PSF/開口は optics.MAX_FIELD_ELEMENTS(2^24)、ABCD 素子列は optics.MAX_SYSTEM_ELEMENTS(1024)、Zernike は MAX_ZERNIKE_TERMS(512)/ MAX_ZERNIKE_ORDER(40)/ MAX_ZERNIKE_BASIS(2^25)。小さな引数から巨大な内部確保が起きる経路(実測: n_max=40 × 4096² で 108 GB)を fail-closed で塞ぐ。| 物理的に不可能な状態も拒否: 偏光度 > 1 の Stokes ベクトル、負の透過率、負の強度、n- | m | が奇数などの不正な Zernike 添字。 |
py -3.11 examples/poc_water_transparent_media.pytable を入力に取れる)abcd_matrix · wavefront_stats · sfr_from_edge · paraxial_trace · seidel_coefficients · spot_stats · tolerance_analysis · wavefront_from_opd
watermedia)ocean_spectrum · ocean_height_field · fresnel_water_air · snell_window · refracted_view · water_attenuation · phase_function_hg · scattering_phase_petzold
Provenance: watermedia.py — OPTICS 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.