fullseye

lens_shading_gain — GFX2D isp op

• データ種: image2d → image2d
• 呼び出し: import fullseye as fs; fs.ledger.lens_shading_gain(flat, pattern=None, smooth_sigma=0.0) (実装を直接呼ぶなら import gfx2d; gfx2d.lens_shading_gain(flat, pattern=None, smooth_sigma=0.0)、台帳から引くなら opsgfx2d.get("lens_shading_gain"))

使い方

The gain map that flattens a flat-field frame: gain = mean / flat per colour channel (or for the whole frame when pattern is None).

Shoot a uniform white target; vignetting and the micro-lens fall-off make the corners darker. Multiplying any later frame by this map undoes that. smooth_sigma > 0 Gaussian-smooths the flat first (per channel) so sensor noise and dust do not become gain speckle. The gain is normalised so the channel mean stays 1 — the map corrects shape, not exposure.

Ground truth: lens_shading_correct(flat, lens_shading_gain(flat)) is a constant frame (each channel equal to its own mean) to 1e-12. Raises ValueError: non-finite input, a zero or negative pixel in the flat (no gain can be defined there), or a negative smooth_sigma.

参考(サンプルデータ・文献)

• サンプルデータ カタログ(DL URL / ライセンス) — 2-D は skimage.data(BSD/public)+ 合成、3-D は実データ源(Stanford/PDS 等)の DL URL。
• 演算子の来歴・参考文献 — この op 族の元になった研究/手法の出典。
• アルゴリズムの正典(著者・年)と用途は上記ファミリ使い方ガイドに記載。

実行できる例(この op を実際に呼ぶ検証済みサンプル)

• poc_tdi_linescan — py -3.11 examples/poc_tdi_linescan.py
• raw_to_display_isp — py -3.11 examples/raw_to_display_isp.py

型が繋がる次の op(image2d を入力に取れる)

shadow_cast_2d · dither · raw_black_level · raw_dead_pixel_mask · raw_dead_pixel_correct · lens_shading_correct · raw_apply_gains · raw_demosaic_bilinear

同カテゴリ(isp)

raw_black_level · raw_dead_pixel_mask · raw_dead_pixel_correct · lens_shading_correct · awb_gains · rgb_apply_gains · raw_apply_gains · raw_demosaic_bilinear

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Provenance: gfx2d.py — GFX2D 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.

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