Thereconstruction quality improvement of holographic stereograms via variable size segmentation

Source Title
SIU 2010 - IEEE 18th Signal Processing and Communications Applications Conference
Print ISSN
Electronic ISSN
169 - 172
Conference Paper
Journal Title
Journal ISSN
Volume Title

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.

Other identifiers
Book Title
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
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