tb_specular_free_transform — 2D typed op

• データ種: rgbimage → rgbimage

• 呼び出し: fullseye.apply(img, "tb_specular_free_transform", a=0.5, b=0.5) (2-D は 1 画像 + 2 スカラつまみ a,b∈[0,1] のモデル)

使い方

Project out the illuminant direction: the part of the image a highlight cannot touch. → (H, W, 3).

`I - (I.G) G for the unit illuminant colour G`. Under the dichromatic

model the interface term is `m_s * G`, so it lies entirely in the removed

direction and the result is invariant to any specular term whatsoever —

exactly, for any lobe shape, any strength, any spatial pattern. That is the

specular-invariant subspace of Mallick et al. (2005); this operator is the

projection itself, with no rotation into named channels, so it stays in RGB

and composes with the rest of the family.

Use it when the *shape* of the specular lobe is unknown or the surface is

textured — feature matching, edge detection and correlation all work in this

subspace without any of the assumptions

:func:specular_diffuse_split needs.

This is a projection, not a picture. The result loses one of three

degrees of freedom (its component along `G` is exactly zero everywhere)

and, for an image with negative values after black-level subtraction, keeps

them. It is not a displayable "highlight-removed photo" and does not claim

to be; for that, use :func:specular_diffuse_split.

Raises `ValueError: *image_rgb* is not a valid (H, W, 3)` linear

RGB image (see :func:specular_diffuse_split); *illuminant_rgb* is not a

non-zero 3-vector.

Typed bridge of the specular op `specular_free_transform into the 2-D evolution registry: the same implementation, called under the op(v, a, b) convention. This op has no tunable parameter; a and b` are unused.

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。

実行できる例(この op を実際に呼ぶ検証済みサンプル)

• (まだありません)

型が繋がる次の op(rgbimage を入力に取れる)

identity · tb_wetness · tb_sensor_capture · tb_specular_diffuse_split · tb_specular_coefficient_map · tb_rgb_to_quaternion

同カテゴリ(typed)

tb_points_to_voxel · tb_estimate_point_normals · tb_iss_keypoints · tb_angle_3points · tb_project_points · tb_render_point_depth · tb_statistical_outlier_removal · tb_radius_outlier_removal

*Provenance: ops.py — 2D 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.