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AMFG
2005
IEEE

A Practical Face Relighting Method for Directional Lighting Normalization

9 years 3 months ago
A Practical Face Relighting Method for Directional Lighting Normalization
We propose a simplified and practical computational technique for estimating directional lighting in uncalibrated images of faces in frontal pose. We show that this inverse problem can be solved using constrained least-squares and class-specific priors on shape and reflectance. For simplicity, the principal illuminant is modeled as a mixture of Lambertian and ambient components. By using a generic 3D face shape and an average 2D albedo we can efficiently compute the directional lighting with surprising accuracy (in real-time and with or without shadows). We then use our lighting direction estimate in a forward rendering step to ¨relight¨arbitrarily-lit input faces to a canonical (diffuse) form as needed for illumination-invariant face verification. Experimental results with the Yale Face Database B as well as real access-control datasets illustrate the advantages over existing pre-processing techniques such as a linear ramp (facet) model commonly used for lighting normalization...
Kuang-Chih Lee, Baback Moghaddam
Added 24 Jun 2010
Updated 24 Jun 2010
Type Conference
Year 2005
Where AMFG
Authors Kuang-Chih Lee, Baback Moghaddam
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