Dictionaries for sparse representation and recovery of reflectances

Steven Lansel; Manu Parmar; Brian A. Wandell

doi:10.1117/12.813769

17 February 2009 Dictionaries for sparse representation and recovery of reflectances

Steven Lansel, Manu Parmar, Brian A. Wandell

Proceedings Volume 7246, Computational Imaging VII; 72460D (2009) https://doi.org/10.1117/12.813769
Event: IS&T/SPIE Electronic Imaging, 2009, San Jose, California, United States

Abstract

The surface reflectance function of many common materials varies slowly over the visible wavelength range. For this reason, linear models with a small number of bases (5-8) are frequently used for representation and estimation of these functions. In other signal representation and recovery applications, it has been recently demonstrated that dictionary based sparse representations can outperform linear model approaches. In this paper, we describe methods for building dictionaries for sparse estimation of reflectance functions. We describe a method for building dictionaries that account for the measurement system; in estimation applications these dictionaries outperform the ones designed for sparse representation without accounting for the measurement system. Sparse recovery methods typically outperform traditional linear methods by 20-40% (in terms of RMSE).

Citation Download Citation

Steven Lansel, Manu Parmar, and Brian A. Wandell "Dictionaries for sparse representation and recovery of reflectances", Proc. SPIE 7246, Computational Imaging VII, 72460D (17 February 2009); https://doi.org/10.1117/12.813769

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