Holograms are rich in high frequency components with less correlation between pixels and therefore compression of holograms is a challenging area. Computer Generated Holograms (CGH) is generated by computing interference patterns represented in complex numbers with the help of computers. Currently for the representation of these complex numbers in CGH, phase-only holograms are widely used. It is an approximation of original hologram, but it suffers from noise. The proposed work deals with representation of values in complex domain into real domain based on quadrant mapping techniques. Compressed hologram representation using the proposed method provides significant increase in quality for reconstruction compared to phase-only hologram.
Optical Scanning Holography (OSH) is a technique that records the three-dimensional information of an object through optical heterodyne scanning. This system has two pupils which enhances processing power and spatial filtering capabilities. Analysis of proposed OSH system in this paper includes two configurations of pupil pairs. In the first case, one pupil is a pulse, and the other is a Gaussian function. The OSH system analyses the adoption of a random phase and Gaussian pupil in the latter case. In the proposed system, the optical transfer function of the recording and reconstruction stages is found out. Subjective evaluation of the optical transfer function is investigated in terms of resolution. Simulations are performed for different parameters of the Gaussian function, various random distributions of the random phase pupil and for other objects. These results can be used with sectioning applications.
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