Validation of the Virtual Gonio-Spectrophotometer Based on the Real Measurements

Abstract

A virtual gonio-spectrophotometer is proposed to performmeasurements of the reflectance spectrum of material surfaces mathematically represented by the bidirectional reflectance functions (BRDF). Our virtual gonio-spectrophotometer can be customized to allow measurements obeying industrial standards such as ISO 2813 or ASTM D523. We demonstrate the application of proposed virtual Gonio-spectrophotometer for the evaluation of digital representation of the material appearance utilizing laboratory measurements. Virtual gonio-spectrophotometer is validated according to measurements obtained with real gonio-spectrophotometer, where real material samples have been used. Presented validation is performed by measuring the total radiant flux reflected from real sample and comparing it to the mathematical representation of sample by BRDF.