Virtual gonio-spectrophotometer for validation of BRDF designs

Andrej Mihálik 1  and Roman Ďurikovič 1
  • 1 Faculty of Mathematics, Physics and Informatics, Mlynská dolina, 842 48, Bratislava, Slovakia

Abstract

Measurement of the appearance of an object consists of a group of measurements to characterize the color and surface finish of the object. This group of measurements involves the spectral energy distribution of propagated light measured in terms of reflectance and transmittance, and the spatial energy distribution of that light measured in terms of the bidirectional reflectance distribution function (BRDF). In this article we present the virtual gonio-spectrophotometer, a device that measures flux (power) as a function of illumination and observation. Virtual gonio-spectrophotometer measurements allow the determination of the scattering profile of specimens that can be used to verify the physical characteristics of the computer model used to simulate the scattering profile. Among the characteristics that we verify is the energy conservation of the computer model. A virtual gonio-spectrophotometer is utilized to find the correspondence between industrial measurements obtained from gloss meters and the parameters of a computer reflectance model.

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Open Physics (former Central European Journal of Physics) is a peer-reviewed Open Access journal, devoted to the publication of fundamental research results in all fields of physics.

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