raw_demosaic_bilinear — GFX2D isp op

• データ種: image2d → rgb

• 呼び出し: import fullseye as fs; fs.ledger.raw_demosaic_bilinear(raw, pattern='RGGB') (実装を直接呼ぶなら import gfx2d; gfx2d.raw_demosaic_bilinear(raw, pattern='RGGB')、台帳から引くなら opsgfx2d.get("raw_demosaic_bilinear"))

使い方

Bayer mosaic → `(H, W, 3)` RGB by bilinear interpolation, in NumPy.

Red and blue occupy one pixel in four, so a missing value is the mean of

the measured neighbours (`[[1,2,1],[2,4,2],[1,2,1]]/4` on the masked

plane); green occupies two in four (`[[0,1,0],[1,4,1],[0,1,0]]/4`). The

border mirrors the mosaic two pixels out with a non-duplicating

reflection, which keeps the 2x2 phase, so a uniform field is exact up to the

edge. This is the same estimate the OpenCV bridge `cfa_to_rgb` makes with

`cv2.COLOR_Bayer*2RGB`, without the 8-bit round trip and without OpenCV.

Ground truth: three affine planes mosaicked and demosaicked come back to

1e-12 away from the border (a bilinear estimate of an affine field is the

field). Bilinear is the textbook baseline: it blurs colour edges into

zipper artefacts; edge-directed methods are not provided here.

Raises `ValueError`: bad *raw* or *pattern*.

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)

• raw_to_display_isp — py -3.11 examples/raw_to_display_isp.py

型が繋がる次の op(rgb を入力に取れる)

srgb_to_linear · linear_to_srgb · blend_mode · light_mask · normal_map_decode · bloom · vignette · chromatic_aberration

同カテゴリ(isp)

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

*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.