Zongrui Li, Qian Zheng, Boxin Shi, Gang Pan, Xudong Jiang
Nanyang Technological University; Zhejiang University; Peking University
Portals
Abstract
Uncalibrated photometric stereo (UPS) is challenging due to the inherent ambiguity brought by the unknown light. Although the ambiguity is alleviated on non-Lambertian objects, the problem is still difficult to solve for more general objects with complex shapes introducing irregular shadows and general materials with complex reflectance like anisotropic reflectance. To exploit cues from shadow and reflectance to solve UPS and improve performance on general materials, we propose DANI-Net, an inverse rendering framework with differentiable shadow handling and anisotropic reflectance modeling. Unlike most previous methods that use non-differentiable shadow maps and assume isotropic material, our network benefits from cues of shadow and anisotropic reflectance through two differentiable paths. Experiments on multiple real-world datasets demonstrate our superior and robust performance.
Related Works
Unsupervised calibrated photometric stereo; Uncalibrated photometric stereo; Shadow handling in photometric stereo; Neural reflectance representation in 3D vision
Comparisons
LL22, SCPS-NIR