Calculation Method of Computer-Generated Hologram Using Ray Tracing Method Considering Refraction

Abstract

A computer-generated hologram (CGH) is a technology expected to achieve ideal 3D displays. To achieve realistic 3D displays using a CGH, it is necessary to establish rendering technologies. However, studies about them are not sucient. Especially, an established method for expressing refraction that arises when a light passes through a transparent object is not available. We describe a new calculation method considering refraction. This method is based on a ray-tracing method used to express optical phenomena such as refraction in computer graphics. We made holograms by this method and conducted optical reconstruction experiments. The results of these experiments showed that the proposed method is valid to display objects with refraction.