Iterative Fourier Transform Algorithm Based on the Segmentation of Target Image for a High-Speed Binary Spatial Light Modulator

Abstract

A digital micro-mirror device (DMD) has the potential to modulate an incident wave with high speed, and the application for holographic display has been studied by many researchers. However, the quality of reconstructed image isn't good in comparison with that from a gray-scale amplitude-only hologram since it is a binary amplitude-only spatial light modulator (SLM). In this paper, we suggest a method generating a set of binary holograms to improve the quality of the reconstructed image. Here, we are concerned with the case for which the object plane is positioned at the Fourier domain of the plane of the SLM. In this case, any point in the Fourier plane is related to all points in the hologram. So there is a chance to generate a set of binary holograms illuminated by incident wave with constant optical power. Moreover, we find an interesting fact that the quality of reconstructed image is improved when the spatial frequency bandwidth of the binary hologram is limited. Therefore, we propose an iterative segmentation algorithm generating a set of binary holograms that are designed to be illuminated by the wave with constant optical power. The feasibility of our method is experimentally confirmed with a DMD.

Expanded Exit-Pupil Holographic Head-Mounted Display With High-Speed Digital Micromirror Device

“…However, the quality of the contents is lower than that of a gray‐scale hologram because it expresses content using a binary hologram. To overcome this problem, techniques that use several binary holograms with time‐multiplexing have been studied to realize gray‐scale , . In this paper, we focus on the expansion of the exit‐pupil of the holographic display instead of the improvement of the quality of individual holograms.…”

360-degree tabletop electronic holographic display

“…Besides the system design issues, the CGH for DMD is binary CGH and it results in the degradation of the image quality severely. The binary CGH optimization problem is still an open problem in the CGH research field [24,25]. Basically, the tabletop display generates 360-degree continuous horizontal parallax.…”