Effect Of Light Source Distance On Apparent Gloss Unevenness

In this paper, we numerically analyze the effect of light source distance on the appearance of gloss unevenness. It is important to measure gloss unevenness because it affects the texture and appearance of a product. We propose a more efficient technique for measuring gloss unevenness. The experimental results for the proposed apparatus in this study are in good agreement with our theoretical analysis. We show that the appearance of the captured gloss unevenness image changes depending on the effect of light source distance. As an application of this gloss unevenness observation technology, we also report on the detection of scratches and coating unevenness in industrial quality control. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement