Object reconstruction from in-line Fresnel holograms without explicit depth focusing


Ozgen M., Tuncer T.

OPTICAL ENGINEERING, cilt.43, ss.1300-1310, 2004 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 43 Konu: 6
  • Basım Tarihi: 2004
  • Doi Numarası: 10.1117/1.1737785
  • Dergi Adı: OPTICAL ENGINEERING
  • Sayfa Sayıları: ss.1300-1310

Özet

We propose two computational techniques for extracting object cross-sectional shape information from digitized in-line Fresnel holograms that do not require prior knowledge of object depths but recover relative depth information along the way. The first algorithm is applicable to hologram segments involving a single particle only. It is based on estimating Fourier transform magnitude and phase of the particle from those of the hologram segment. The second algorithm conducts a joint inverse filtering and depth search procedure so as to minimize (or maximize) a binariness (or a concentration) criterion defined over the output object function. It is applicable to multiple-particle, multiexposure holograms as well. The proposed techniques are illustrated on synthesized holograms and their practical limitations are discussed. C 2004 Society of Photo-Optical Instrumentation Engineers.