Paper Info
Title
Surface enhancement using real-time photometric stereo and reflectance transformation
Abstract
Photometric stereo recovers per-pixel estimates of surface orientation from images of a surface under varying lighting conditions. Transforming reflectance based on recovered normal directions is useful for enhancing the appearance of subtle surface detail. We present the first system that achieves real-time photometric stereo and reflectance transformation. A high-speed video camera, computer controlled light sources and fast GPU implementations of the algorithms enable both methods. We also present novel GPU-accelerated normal transformations before relighting that "amplify" shape detail. By applying standard image processing methods to our computed normal image, we can selectively enhance surface detail at different frequencies. Our system allows users in fields such as forensics, archeology and dermatology to investigate objects and surfaces by simply holding them in front of the camera. Real-time analysis of surface roughness for metrology can also be performed from the extracted normal field.
Year
DOI
Venue
2006
10.2312/EGWR/EGSR06/245-250
Rendering Techniques
Keywords
Field
DocType
surface orientation,real-time photometric stereo,computed normal image,normal transformation,normal direction,normal field,shape detail,surface roughness,surface detail,subtle surface detail,reflectance transformation,transforming reflectance,surface enhancement,real time,photometric stereo,shading,color
Computer vision,Computer graphics (images),Computer science,Metrology,Image processing,Real-time computer graphics,Artificial intelligence,Video camera,Rendering (computer graphics),Image-based modeling and rendering,Photometric stereo,Surface roughness
Conference
ISBN
Citations 
PageRank 
3-905673-35-5
30
1.28
References 
Authors
14
4
Name
Order
Citations
PageRank
Tom Malzbender140939.12
Bennett Wilburn284363.95
Dan Gelb328822.01
Bill Ambrisco4301.28