Optical: systems and elements – Holographic system or element – For synthetically generating a hologram
Reexamination Certificate
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.
Baba Shigeyuki
Kihara Nobuhiro
Assaf Fayez G
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Sony Corporation
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