Estimation of 3-D shape and reflectance using moire system with multiple light sources and reflection model

摘要

We consider a method of determining the shape of object and the reflectance of its surface simultaneously using the Moire' technique and shape from shading. If the object surface has multiple reflectance, it must be divided into regions of different reflectance. This region division is formulated as simple clustering problem. By applying expectation-maximization(EM) algorithm, shape and reflectance can be estimated, and region division can be performed However, as the relationship between the position of the light source and the gradient of the object surface gives rise to ambiguities in the reflectance, region division may fail. To solve this problem, we capture multiple Moire' images and propose a method of estimation using these images. The usefulness of the proposed method is confirmed by results obtained from simulation and real image experiments.