PHYSICAL INDICES FOR REPRESENTING MATERIAL PERCEPTION WITH REGARD TO GLOSSINESS, TRANSPARENCY, AND ROUGHNESS

The final goal of this study is to build a total appearance model for human perception of the qualities of a material. To achieve this objective, we propose physical indices for modelling perception with regard to glossiness, transparency, and roughness by investigating the relationship between measurable physical properties and the appearance of real materials in this study. In our physical measurements and subjective evaluations, we used 34 stimuli exemplifying ten material categories. As a result, we found physical indices corresponding to subjective perception as follows: (1) The index of perceptual gloss correlates to a nonlinear transform of physical glossiness. (2) The index of perceptual transparency corresponds to the luminance difference of material surfaces with white vs black backgrounds. (3) The index of perceptual roughness correlates to the edge intensity detected from the captured images.