Oliff & Berridge, PLC
Data playback method and device for data recorded as a hologram
There is provided a data playback method including: acquiring first image data by illuminating reference light for reading onto an optical recording medium on which a hologram has been recorded by Fourier transforming and simultaneously illuminating reference light and signal light expressing digital data as a light-and-dark image, and detecting an inverse Fourier-transform image of diffracted light which is diffracted by the recorded hologram; acquiring second image data, which is a reversal image of the first image data, by generating combined light by combining the diffracted light and a dc component whose phase is different than a phase of a dc component of the signal light included in the diffracted light, and detecting an inverse Fourier-transform image of the combined light; and computing a difference in luminance for each pixel of the light-and-dark image, by carrying out computing processing by using the first and second image data.
Fuji Xerox Co., Ltd.
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Yasuhiro Kazuhiro Katsunori Hisae Koichi Jiro Shin Makoto
Ogasawara Hayashi Kawano Yoshizawa Haga Minabe Yasuda Furuki