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An Image based Measurement System for Anisotropic Reflection
Author(s) -
Karner Konrad F.,
Mayer Heinz,
Gervautz Michael
Publication year - 1996
Publication title -
computer graphics forum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 120
eISSN - 1467-8659
pISSN - 0167-7055
DOI - 10.1111/1467-8659.1530119
Subject(s) - bidirectional reflectance distribution function , rendering (computer graphics) , computer science , reflectivity , computer vision , range (aeronautics) , reflection (computer programming) , artificial intelligence , computer graphics (images) , anisotropy , system of measurement , optics , materials science , physics , astronomy , composite material , programming language
This paper introduces an image based method for measuring bidirectional reflectance distribution functions (BRDF). The measurement system uses a CCD camera connected to a workstation to capture images from the material under investigation. The evaluation of the BRDF is performed in an image processing step, gathering BRDF values with a broad range of incident and reflected angles, followed by a fitting process, where these values are approximated by a chosen reflectance model. Absolute BRDF values are obtained by the usage of a diffuse reflectance standard. It is shown that the proposed measurement system produces very reasonable results compared to accurate measurements. Thus, it is an easy and cost efficient way to measure material properties needed for physically based rendering algorithms.