Verification of Physically Based Rendering Algorithms

Christiane Ulbricht, Alexander Wilkie, Werner Purgathofer
Verification of Physically Based Rendering Algorithms
Computer Graphics Forum, 25(2):237-255, June 2006.

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Abstract

Within computer graphics, the field of predictive rendering is concerned with those methods of image synthesis which yield results that do not only look real, but are also radiometrically correct renditions of nature, i.e.which are accurate predictions of what a real scene would look like under given lighting conditions.

In order to guarantee the correctness of the results obtained by such techniques, three stages of such a rendering system have to be verified with particular care: the light reflection models, the light transport simulation and the perceptually based calculations used at display time.

In this report, we will concentrate on the state of the art with respect to the second step in this chain. Various approaches for experimental verification of the implementation of a physically based rendering system have been proposed so far. However, the problem of proving that the results are correct is not fully solved yet, and no standardized methodology is available. We give an overview of existing literature, discuss the strengths and weaknesses of the described methods and illustrate the unsolved problems. We also briefly discuss the related issue of image quality metrics.

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BibTeX

@article{ulbricht-2006-VOP,
  title =      "Verification of Physically Based Rendering Algorithms",
  author =     "Christiane Ulbricht and Alexander Wilkie and Werner
               Purgathofer",
  year =       "2006",
  abstract =   "Within computer graphics, the field of predictive rendering
               is concerned with those methods of image synthesis which
               yield results that do not only look real, but are also
               radiometrically correct renditions of nature, i.e.which are
               accurate predictions of what a real scene would look like
               under given lighting conditions.   In order to guarantee the
               correctness of the results obtained by such techniques,
               three stages of such a rendering system have to be verified
               with particular care: the light reflection models, the light
               transport simulation and the perceptually based calculations
               used at display time.  In this report, we will concentrate
               on the state of the art with respect to the second step in
               this chain. Various approaches for experimental verification
               of the implementation of a physically based rendering system
               have been proposed so far. However, the problem of proving
               that the results are correct is not fully solved yet, and no
               standardized methodology is available. We give an overview
               of existing literature, discuss the strengths and weaknesses
               of the described methods and illustrate the unsolved
               problems. We also briefly discuss the related issue of image
               quality metrics. ",
  month =      jun,
  issn =       "0167-7055",
  journal =    "Computer Graphics Forum",
  number =     "2",
  volume =     "25",
  pages =      "237--255",
  keywords =   "visual comparisons, experimental validation, test scenes,
               physically based rendering, image quality metrics",
  URL =        "https://www.cg.tuwien.ac.at/research/publications/2006/ulbricht-2006-VOP/",
}