| 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. |
