《法線之光：通用光度立體視覺的統一特徵表示》

Light of Normals: Unified Feature Representation for Universal Photometric Stereo

June 23, 2025

作者: Hong Li, Houyuan Chen, Chongjie Ye, Zhaoxi Chen, Bohan Li, Shaocong Xu, Xianda Guo, Xuhui Liu, Yikai Wang, Baochang Zhang, Satoshi Ikehata, Boxin Shi, Anyi Rao, Hao Zhao

cs.AI

摘要

通用光度立體（PS）旨在不依賴特定照明模型的情況下，從任意光照條件下的物體中恢復高質量的表面法線。儘管最近出現了如SDM-UniPS和Uni MS-PS等進展，但仍存在兩個基本挑戰：1）變化的光照與表面法線特徵之間的深度耦合，其中觀察到的亮度模糊性使得難以確定亮度變化是源於光照變化還是表面方向；以及2）在複雜表面上保留高頻幾何細節，其中精細的幾何形狀會產生自陰影、相互反射和微妙的法線變化，而傳統的特徵處理操作難以準確捕捉這些細節。

English

Universal photometric stereo (PS) aims to recover high-quality surface normals from objects under arbitrary lighting conditions without relying on specific illumination models. Despite recent advances such as SDM-UniPS and Uni MS-PS, two fundamental challenges persist: 1) the deep coupling between varying illumination and surface normal features, where ambiguity in observed intensity makes it difficult to determine whether brightness variations stem from lighting changes or surface orientation; and 2) the preservation of high-frequency geometric details in complex surfaces, where intricate geometries create self-shadowing, inter-reflections, and subtle normal variations that conventional feature processing operations struggle to capture accurately.