Estimation of object surface reflectance properties considering interreflections

摘要

In mixed reality which merges a virtual object into a real environment, virtualizing a real object is use full to represent objects in virtual environments photorealistically. In particular, it is important to virtualize object surface reflectance properties to resolve a problem of contradiction between virtual and real illumination conditions. Therefore, we developed a method to estimate reflectance properties of object surfaces densely. However, with respect to an object whose geometry is complicated, it is difficult to estimate surface reflectance properties faithfully, since interreflections occur. This paper describes a new method of densely estimating non-uniform surface reflectance properties of real objects constructed of convex and concave surfaces with interreflections. We use registered range and surface color texture images obtained by a laser rangefinder. The proposed method first determines positions of light to take color images for discriminating diffuse and specular reflection components of surface reflection. Then, surface reflectance properties are estimated based on radiosity. Experiments show the usefulness of the proposed method.