Color constancy for stereo imaging

Date of Award

2012

Degree Name

M.S. in Electrical Engineering

Department

Department of Electrical and Computer Engineering

Advisor/Chair

Advisor: Keigo Hirakawa

Abstract

Reflectance values of real-world objects are better approximated by Bidirectional Reflectance Distribution Function (BRDF) models than Lambertian models. In this thesis, we propose a 3D color constancy method to take advantage of the angular dependencies of reflectance values. Stereo matching techniques are used to reconstruct the left camera image form the right, then the difference between the original left camera image and the reconstructed one is assumed to be caused by the BRDF. The illuminant is estimated by fitting a line to this difference image in the total least squares sense. This is in contrast to the existing color constancy methods which use a single 2D image to estimate the illuminant. Experimental results show that 3D color constancy offers a significant improvement over the 2D methods.

Keywords

Stereoscopic cameras, Reflectance, Image reconstruction

Rights Statement

Copyright © 2012, author

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