Masahito NAGATA, Katsunori OKAJIMA¹, and Masayuki OSUMI²

Graduate School of Environment and Information Sciences, Yokohama National University, Yokohama 240-8501, Japan
¹Faculty of Environment and Information Sciences, Yokohama National University, Yokohama 240-8501, Japan
²Office Color Science, Kumamoto 862-0954, Japan

(Received April 2, 2007; Accepted September 15, 2007)

The mechanism and temporal characteristics of gloss perception are not entirely clear. In addition, the formulation for predicting gloss perception from photometric values has not been established. In the present study, we conducted an experiment to measure several temporal characteristics of gloss perception in order to clarify the mechanism. All stimuli were rendered as computer graphics with Phong and Lambert models to provide gloss perception to human observers. We measured perceptual glossiness with a magnitude estimation method and perceptual diffuse/specular reflectance of test stimuli with a matching method under several stimulus conditions, such as reflectance coefficients and stimulus duration. The results showed that the perceptual specular component and perceptual glossiness increase with decreasing stimulus duration. Finally, we proposed a formulation to predict perceptual glossiness as a function of stimulus duration.

Key words: gloss perception, temporal characteristic, diffuse reflectance, specular reflectance, Phong model, Lambert model