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      • Department of Electrical and Electronics Engineering
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      Thereconstruction quality improvement of holographic stereograms via variable size segmentation

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      Author
      Şahin, Erdem
      Onural, Levent
      Kang, Hoonjong
      Date
      2010
      Source Title
      SIU 2010 - IEEE 18th Signal Processing and Communications Applications Conference
      Publisher
      IEEE
      Pages
      169 - 172
      Language
      Turkish
      Type
      Conference Paper
      Item Usage Stats
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      Abstract
      As computer generated holograms becomes more common, the fast computation of holographic interference patterns in digital environment becomes a necessity. Since the computation time of holograms via Fresnel (or Rayleigh-Sommerfeld) diffraction models makes real time applications impossible, the holographic stereograms are developed to be a solution for this problem. Holographic stereograms divide the hologram plane into segments. In phase added stereograms the coordinates of 3D source points are used while calculating the diffraction field. And that enables to calculate the diffraction field with appropriate sized FFTs. Although the phase added stereograms are advantageous in terms of computation time, the quality of the reconstructed three dimensional images may not be satisfactory. The main reason is that the diffraction field of a given point source is approximated as a pure complex sinusuoid in each segment. To increase the reconstruction quality, we propose a method that uses variable sized segments, as opposed to previously developed holographic stereograms that use fixed sized segments. While approximating the diffraction field of a point source, higher frequency regions are covered with smaller segments and lower frequency regions with larger segments. As a result of this, we keep the total number of oscillations of pure sinusoidal waves constant in each segment. The simulations that we carried out for a point source show that we are able to obtain better quality reconstruction with our method. ©2010 IEEE.
      Keywords
      Computation time
      Computer generated holograms
      Diffraction fields
      Diffraction models
      Digital environment
      Fast computation
      Fresnel
      Higher frequencies
      Holographic interference
      In-phase
      Lower frequencies
      Point sources
      Quality improvement
      Rayleigh
      Real-time application
      Reconstruction quality
      Sinusoidal wave
      Source points
      Three dimensional images
      Diffraction
      Holograms
      Signal processing
      Three dimensional
      Computer generated holography
      Permalink
      http://hdl.handle.net/11693/28476
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/SIU.2010.5652766
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      • Department of Electrical and Electronics Engineering 3614
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