Quantitative assessment of perceived gloss and roughness of material surfaces based on two-dimensional luminance distribution data

摘要

Color is a major factor that determines appearance of an object surface. The overall appearance of an object surface, however, consists of many other attributes such as gloss, roughness or translucency. This study examined quantitative assessments of perceived gloss and roughness of surfaces of several materials based on two-dimensional luminance distribution data. In the experiment, subjects viewed a surface of the test material and assessed perceptual gloss and roughness of the material using magnitude estimation. We obtained perceptual judgments of the gloss and roughness of the test materials made by 15 subjects. In the analysis, we tried to find physical characteristics of the surface that determine the perceptual appearance of the materials. For the gloss assessment, we assumed that the luminance distribution produced by the test material could be approximated by the addition of the luminance distribution by a specular surface and that by the diffusing surface. The results indicated that the additivity coefficient gave good estimation for the perceived gloss of the materials. Quantitative methods to describe perceived gloss and roughness of a material surface based on luminance distribution data are discussed.