Applied Sciences (Apr 2020)

Enhancing the Quality of Sampled Phase-Only Hologram (SPOH) Based on Time-Division Comb Filtering

  • Peter W. M. Tsang,
  • Jung-Ping Liu,
  • Hoson Lam,
  • Ting-Chung Poon

DOI
https://doi.org/10.3390/app10082732
Journal volume & issue
Vol. 10, no. 8
p. 2732

Abstract

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Generation of digital phase-only Fresnel holograms is an important research area in digital holography, as it leads to a substantial simplification of a holographic display system. However, the quality of the reconstructed image of a hologram without the magnitude component is heavily degraded. The problem can be reduced by down-sampling the intensity of an image prior to generating the hologram. The method, referred to as “sampled phase-only hologram” (SPOH) generation, results in reconstructed images that are masked with the pattern of the down-sampling lattice. This paper reports a novel, low complexity method to alleviate this problem through the concept of comb filtering. Results reveal prominent enhancement on the reconstructed image of a SPOH.

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