@inproceedings{4fb757bd0759471cb751606f2cd8d3be,
title = "Accurate recovery of a specularity from a few samples of the reflectance function",
abstract = "We present a new technique for estimating the specular peak of the bidirectional reflectance distribution function (BRDF) based on finite rate of innovation (FRI) sampling. The specular component of the BRDF varies rapidly, so it is challenging to acquire it by point-wise sampling. Yet, the knowledge of its precise location is key to render realistically complex materials. We show how to adapt the FRI framework to accurately determine the location of a single pulse when the sampling kernel is unknown. We use this result to determine the position of the specularity, and then estimate its shape by non-linear optimization. We demonstrate the feasibility of our approach in simulations and via a practical experiment using a custom-built BRDF acquisition device.",
keywords = "Bidirectional Reflectance Distribution Function, Finite Rate of Innovation, Sampling, Specularity",
author = "Gilles Baechler and Ivan Dokmanic and Loic Baboulaz and Martin Vetterli",
note = "Funding Information: Authors are with LCAV-EPFL. This work was supported by the Swiss National Science Foundation grant : Inverse Problems Regularized by Sparsity, no. 20FP21151073 Publisher Copyright: {\textcopyright} 2016 IEEE.; 41st IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP 2016 ; Conference date: 20-03-2016 Through 25-03-2016",
year = "2016",
month = may,
day = "18",
doi = "10.1109/ICASSP.2016.7471946",
language = "English (US)",
series = "ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
pages = "1596--1600",
booktitle = "2016 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP 2016 - Proceedings",
address = "United States",
}