法线之光：统一特征表示用于通用光度立体视觉

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

通用光度立体（PS）技术旨在无需依赖特定光照模型的情况下，从任意光照条件下的物体中恢复高质量的表面法线。尽管近期出现了如SDM-UniPS和Uni MS-PS等进展，但仍存在两大根本性挑战：1）变化光照与表面法线特征之间的深度耦合，其中观察到的亮度模糊性使得难以判断亮度变化是源于光照改变还是表面朝向；2）复杂表面上高频几何细节的保留，其中精细的几何结构会产生自阴影、相互反射及微妙的法线变化，这些是传统特征处理操作难以准确捕捉的。

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.