tb_specular_free_transform — 2D typed op

• 資料種類:rgbimage → rgbimage

• 呼叫:fullseye.apply(img, "tb_specular_free_transform", a=0.5, b=0.5)(2-D 的模型是一張圖 + 兩個純量旋鈕 a,b∈[0,1])

用法

投影去除光源方向：影像中反光無法觸及的部分。→ (H, W, 3)。

> 以下的詳細說明為原文 —— 摘要與標題已翻譯。

`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.

參考(範例資料・文獻)

• 範例資料目錄(下載 URL / 授權) —— 2-D 用 skimage.data(BSD/公有領域)加合成圖,3-D 給出真實資料源(Stanford/PDS 等)的下載 URL。

• 運算子來歷與參考文獻 —— 該運算子族所依據的研究/方法出處。

可執行的範例(實際呼叫該運算子並已驗證的樣例)

• (尚無)

型別可銜接的下一個運算子(可接受 rgbimage 作為輸入)

identity · tb_wetness · tb_sensor_capture · tb_specular_diffuse_split · tb_specular_coefficient_map · tb_rgb_to_quaternion

同類別(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 運算子登記表。本條目由 tools/opdocs.py md 自動產生(請勿手動編輯)。*

© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.