Hologram recording and reproduction method, hologram...

Details Hologram recording and reproduction method, hologram... Hologram recording and reproduction method, hologram...

2005-02-04

2008-08-26

Assaf, Fayez G (Department: 2872)

Optical: systems and elements

Holographic system or element

For synthetically generating a hologram

C359S029000

Reexamination Certificate

active

07417776

ABSTRACT:
A method and apparatus is disclosed which can reproduce multi-value data with high reproducibility from a hologram recording medium having data recorded in multi-values therein and can reduce the error rate of reproduction data. A reference gradation pattern is recorded in a medium, and luminance unevenness of a gradation pattern obtained by reproducing the gradation pattern is corrected. A gamma characteristic of the medium is determined based on the reproduction gradation pattern, and a modulation pattern produced using easily separable luminance values determined based on the gamma characteristic is displayed on a spatial light modulator to record data in multi-values into the medium. Thereupon, the data are oversampled and recorded, and a block of the reproduced data is decoded depending upon a sequence of relative luminance levels of pixels in the block to decode the entire reproduced multi-value data.

REFERENCES:
patent: 6763142 (2004-07-01), Dai et al.
patent: 6961161 (2005-11-01), Tsukagoshi et al.

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