<title>Fast computer graphics rendering for full parallax spatial displays</title>

Abstract

ABSTRACT This paper presents a computer graphics algorithm useful for rapidly generating image data for full parallax spatial displayssuch as full parallax holographic stereograms. Other techniques such as custom-designed ray-tracing packages and image-based rendering techniques have significant disadvantages for rapid display production. In contrast, the method described hereuses scanline-based computer graphics techniques. The described implementation uses the widely available OpenGLTM graph-ics library and takes advantage of acceleration by computer graphics hardware subsystems. The time required to render theimage data of a moderately-sized scene for a single holographic exposure is less than one second using desktop computer sys-tems. This method is compatible with both one-step and master-transfer holographic recording geometries. Details of the algo-rithm are included.Keywords: full parallax, computer graphics, holographic stereogram, holography. 1. INTRODUCTION In the field of computer-generated holographic stereography, improvements in holographic printer design and image genera-tion methods have recently turned full parallax displays from a rare novelty to a viable technology. A growing number ofresearch groups are experimenting with full parallax stereograms in both the master-transfer and one-step geometries. Theseexperiments have led to an increasing demand for an efficient yet flexible way to render image sequences for full parallax dis-plays.