Calculation method considering the reflectance distribution for metallic objects in CGH

Abstract

We propose a new method of calculating the reflectance distribution on object surfaces for computer-generated holograms to improve the reality of reconstructed images, which takes into consideration reflection on the surfaces of metallic objects. It is based on the Blinn or the Torrance-Sparrow reflection model that has been established in computer graphics. Moreover, we also take into account the Fresnel equation for the method, which provides the degree of reflection on metallic surfaces. We adapted this model to the process of calculating computer-generated holograms, so that various reflectance distributions could be derived. In our experiments, we carried out comparison theoretical and simulated intensity distributions, optical reconstructed experiments, and computer simulations. As a result, we obtained the reflectance distributions of reconstructed images by using the new approach.