On Cross-Validation and Resampling of BRDF Data Measurements

Vlastimil Havran, Attila Neumann, Georg Zotti, Werner Purgathofer, Hans-Peter Seidel
On Cross-Validation and Resampling of BRDF Data Measurements
In Proceedings SCCG 2005, pages 161-168. May 2005.
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Abstract

We discuss the validation of BTF data measurements by means used for BRDF measurements. First, we show how to apply the Helmholtz reciprocity and isotropy for a single data set. Second, we discuss a cross-validation for BRDF measurement data obtained from two different measurement setups, where the measurements are not calibrated or the level of accuracy is not known. We show the practical problems encountered and the solutions we have used to validate physical setup for four material samples. We describe a novel coordinate system suitable for resampling the BRDF data from one data set to another data set. Further, we show how the perceptually uniform color space CIELab is used for cross-comparison of BRDF data measurements, which were not calibrated.

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@inproceedings{havran-2005-sccg,
  title =      "On Cross-Validation and Resampling of BRDF Data Measurements",
  author =     "Vlastimil Havran and Attila Neumann and Georg Zotti and
               Werner Purgathofer and Hans-Peter Seidel",
  year =       "2005",
  abstract =   "We discuss the validation of BTF data measurements by means
               used for BRDF measurements. First, we show how to apply the
               Helmholtz reciprocity and isotropy for a single data set.
               Second, we discuss a cross-validation for BRDF measurement
               data obtained from two different measurement setups, where
               the measurements are not calibrated or the level of accuracy
               is not known. We show the practical problems encountered and
               the solutions we have used to validate physical setup for
               four material samples. We describe a novel coordinate system
               suitable for resampling the BRDF data from one data set to
               another data set. Further, we show how the perceptually
               uniform color space CIELab is used for cross-comparison of
               BRDF data measurements, which were not calibrated.",
  pages =      "161--168",
  month =      may,
  booktitle =  "Proceedings SCCG 2005",
  location =   "Budmerice, Slovakia",
  keywords =   "reflectance function, BRDF data acquisition, BRDF data
               validation, predictive rendering",
  URL =        "http://www.cg.tuwien.ac.at/research/publications/2005/havran-2005-sccg/",
}