Color Computer-Generated Hologram Generation Using Random Phase-Free Method

Abstract

We succeeded in improving the image quality of a color reproduction image by using random phase-free method. This method enabled the zoom of the reproduction image without lens. Conventional color computer-generated hologram was applied random phase to enlarge reproduction image regardless of hologram size. However, the random phase generated speckle noise and degraded the reproduction image. Computer-generated hologram was encoded with Frank code and Schroeder code to reduce a speckle noise at the time of reproduction. The both method need lens to expand reproduction image in optical system. In this paper, we used random phase-free method to improve the reproduction image. As the result of simulation and experiment with optical system, we succeeded in improving the image quality and enlarging the color reproduction image.