Multiplexed Acquisition of Bidirectional Texture Functions for Materials

Phillip Urban, Maria V. Ortiz Segovia, and Francisco H. Imai (Editors)
In proceedings of Measuring, Modeling, and Reproducing Material Appearance 2015, IS&T/SPIE, Mar. 2015
 

Abstract

The bidirectional texture function (BTF) has proven a valuable model for the representation of complex spatially-varying material reflectance. Its image-based nature, however, makes material BTFs extremely cumbersome to acquire: in order to adequately sample high-frequency details, many thousands of images of a given material as seen and lit from different directions have to be obtained. Additionally, long exposure times are required to account for the wide dynamic range exhibited by the reflectance of many real-world materials.

We propose to significantly reduce the required exposure times by using illumination patterns instead of single light sources (“multiplexed illumination”). A BTF can then be produced by solving an appropriate linear system, exploiting the linearity of the superposition of light. Where necessary, we deal with signal-dependent noise by using a simple linear model derived from an existing database of material BTFs as a prior. We demonstrate the feasibility of our method for a number of real-world materials in a camera dome scenario.

Keywords: bidirectional texture function, Digital Material Appearance, multiplexed illumination

Images

Bibtex

@INPROCEEDINGS{ddb-2015-mamb,
     author = {den Brok, Dennis and Steinhausen, Heinz Christian and Hullin, Matthias B. and Klein, Reinhard},
     editor = {Urban, Phillip and Ortiz Segovia, Maria V. and Imai, Francisco H.},
      title = {Multiplexed Acquisition of Bidirectional Texture Functions for Materials},
  booktitle = {Measuring, Modeling, and Reproducing Material Appearance 2015},
     series = {Proc. SPIE},
     volume = {9398},
     number = {14},
       year = {2015},
      month = mar,
  publisher = {IS{\&}T/SPIE},
   keywords = {bidirectional texture function, Digital Material Appearance, multiplexed illumination},
   abstract = {The bidirectional texture function (BTF) has proven a valuable model for the representation of
               complex spatially-varying material reflectance.
               Its image-based nature, however, makes material BTFs extremely cumbersome to acquire: in order to
               adequately sample high-frequency details, many thousands of images of a given material as seen and
               lit from different directions have to be obtained.
               Additionally, long exposure times are required to account for the wide dynamic range exhibited by
               the reflectance of many real-world materials.
               
               We propose to significantly reduce the required exposure times by using illumination patterns
               instead of single light sources (``multiplexed illumination'').
               A BTF can then be produced by solving an appropriate linear system, exploiting the linearity of the
               superposition of light.
               Where necessary, we deal with signal-dependent noise by using a simple linear model derived from an
               existing database of material BTFs as a prior.
               We demonstrate the feasibility of our method for a number of real-world materials in a camera dome
               scenario.},
       isbn = {978-1-6284-1488-2},
        url = {http://dx.doi.org/10.1117/12.2078396},
        doi = {10.1117/12.2078396}
}