PHOTOMETRIC STEREO ASSISTED DRAWING OF ARCHITECTURAL RELIEFS

Use of non-photorealistic rendering and photometric stereo in making bas-reliefs from photographs

Automatic bas-relief generation from 2D photographs potentially has applications to coinage, commemorative medals and souvenirs. However current methods are not yet ready for real use in industry due to insufficient artistic effect, noticeable distortion, and unbalanced contrast. We previously proposed a shape-from-shading (SFS) based method to automatically generate bas-reliefs from single fro...

Towards Outdoor Photometric Stereo

This paper presents a framework to perform outdoor photometric stereo by utilizing environment light. We present the main considerations in designing the framework and steps of the processing pipeline. Our framework extends existing algorithms to meet the robustness and variability necessary to operate out of a laboratory environment. We verify our environment light photometric stereo framework...

Photometric stereo endoscopy.

While color video endoscopy has enabled wide-field examination of the gastrointestinal tract, it often misses or incorrectly classifies lesions. Many of these missed lesions exhibit characteristic three-dimensional surface topographies. An endoscopic system that adds topographical measurements to conventional color imagery could therefore increase lesion detection and improve classification acc...

Advances in Photometric Stereo

Ring-Light Photometric Stereo

We propose a novel algorithm for uncalibrated photometric stereo. While most of previous methods rely on various assumptions on scene properties, we exploit constraints in lighting configurations. We first derive an ambiguous reconstruction by requiring lights to lie on a view centered cone. This reconstruction is upgraded to Euclidean by constraints derived from lights of equal intensity and m...