Hologram reproduction apparatus and reproduction method

Details Hologram reproduction apparatus and reproduction method Hologram reproduction apparatus and reproduction method

2005-03-10

2008-12-30

Dinh, Tan X (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S126000

Reexamination Certificate

active

07471609

ABSTRACT:
A hologram reproduction apparatus includes a light-receiving unit such as a two-dimensional sensor which obtains two-dimensionally modulated image data, and an A/D converter which A/D-converts analog data obtained by the light-receiving unit into digital data. In addition, the hologram reproduction apparatus detects a number of pixels having a digital value larger than a first defined value in the A/D-converted image data for one page, by a first pixel number detecting unit. The hologram reproduction apparatus controls a magnitude value of the image data at the time of the A/D conversion by the first control unit so that the number of detected pixels is within a predetermined range. Thereby, a dynamic range of the A/D conversion to the two-dimensional modulated image data can effectively be used. Therefore, a quantization noise due to the A/D conversion can be reduced, and also a reproduction S/N can be improved.

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