Distortion Compensation of Reconstructed Hologram Image in Digital Holographic Display Based on Viewing Window

• Published in: ETRI journal Vol. 39; no. 4; pp. 480 - 492
• Main Authors: Park, Minsik, Kim, Hyun‐Eui, Choo, Hyon‐Gon, Kim, Jinwoong, Park, Cheong Hee
• Format: Journal Article
• Language: English
• Published: Electronics and Telecommunications Research Institute (ETRI) 01.08.2017; 한국전자통신연구원
• Subjects: Holographic display; Wave aberration; Zernike polynomial; 전자/정보통신공학
• ISSN: 1225-6463; 2233-7326
• DOI: 10.4218/etrij.17.0116.0049

A holographic display based on a viewing window enables the converging of a reconstruction wave into a viewing window by means of an optical system. Accordingly, a user can observe a reconstructed hologram image, even with a small diffraction angle. It is very difficult to manufacture an optical system with no aberrations; thus, it is inevitable that a certain amount of wave aberrations will exist. A viewing‐window‐based holographic display, therefore, always includes distortions in an image reconstructed from a hologram pattern. Compensating the distortions of a reconstructed image is a very important technical issue because it can dramatically improve the performance when reconstructing a digital three‐dimensional content image from a hologram pattern. We therefore propose a method for suppressing image distortion by measuring and compensating the wave aberration calculated from a Zernike polynomial, which can represent arbitrary wave aberrations. Through our experimental configuration using only numerical calculations, our proposed method decreased the reconstructed image distortion by more than 28%.