物体からの拡散反射光の推定

概要

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This paper presents a new method for estimating diffuse reflection. The method is based on the dichromatic reflection model which says reflection at an object surface consists of two components, i.e. diffuse reflection and specular reflection. The components represent object color and light source color respectively and play important roles in Object Recognition and Computer Graphics. However, estimating the components separately has been difficult. The presented method based on an idea of using a cuboid to separate the components. First, it is pointed out that three surfaces of a cuboid illuminated by parallel rays give pure diffuse reflection (DR) to a camera sensing the surfaces. The second point is that normal DR radiance (NDR) corresponding to normally incident rays can be derived from radiance of the surfaces. The NDR gives the highest value of DR and light source direction. Finally, DR models at rounded edges are analytically studied and results of experiment suggest that the dichromatic reflection model is not available.
福山大学の論文