Ease-to-use approach of BRDF recovery from 360°Light Probe

Abstract

We present an easy-to-use measurement of BRDF for material appearance of three-dimensional object based on the estimation of surface reflectance properties with 360-degree light probe. Conventional methods of BRDF measurement such as gonio-reflectometry have some problems relating to the size, cost, and difficulty of operation. Appearance from Motion Method proposed by Dong et al. is appropriate to conquer above problems. Their method attempted to estimate the surface reflectance under unknown incident light component. However, a use of multiple unknown parameters causes the loss of convergence, and sometimes sacrifices the accuracy and computational cost. Therefore, we improved their algorithm of Appearance from Motion method by using an omni-directional camera as a light probe. We demonstrate valuable results: Higher reproducibility and lower cost of computation than those of the conventional method.