Title:
OPTICAL TWO-DIMENSIONAL DISCRETE COSINE TRANSFORMATION DEVICE AND OPTICAL TWO-DIMENSIONAL DISCRETE COSINE TRANSFORMATION METHOD
Document Type and Number:
Japanese Patent JP3188119
Kind Code:
B2
Abstract:
PURPOSE: To provide an optical two-dimensional discrete cosine transformation device and an optical two-dimensional discrete cosine transformation method performing two-dimensional discrete cosine transformation at a high speed with high precision.
CONSTITUTION: The optical two-dimensional discrete cosine transformation device is constituted of an image display means 2 displaying an image, a light radiation means 1 radiating light toward the image displayed on the image display means 2, a photoelectric transducing means 3 photoelectrically transducing the light transmitted through the image display means 2, and an amplifier means 4 amplifying the electric signal transduced by the photoelectric transducing means 3, and the two-dimensional discrete cosine transformation is executed by the light. The device is, further, provided with a light intensity modulation means 7 modulating the light intensity of the light radiated by the light radiation means 1 in row unit or in column unit and an amplification factor modulation means 8 modulating the amplification factor of the electric signal amplified by the amplifier means 4 in column unit when light intensity is modulated in row unit by the light intensity modulation means 7 and modulating the amplification factor in row unit when light intensity is modulated in column unit by the light intensity modulation means 7.
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Inventors:
Isashi Koide
Kouki Shimizu
Shunichi Sato
Kouki Shimizu
Shunichi Sato
Application Number:
JP32058394A
Publication Date:
July 16, 2001
Filing Date:
December 22, 1994
Export Citation:
Assignee:
Sharp Corporation
International Classes:
G02F3/00; G06T9/00; H04N19/60; H04N19/625; H04N19/85; (IPC1-7): G02F3/00; G06T9/00; H04N7/30
Domestic Patent References:
| JP787484A | ||||
| JP6102556A | ||||
| JP5333398A | ||||
| JP5313222A | ||||
| JP473725A | ||||
| JP3282434A | ||||
| JP3138623A | ||||
| JP2120917A | ||||
| JP6255622A |
Attorney, Agent or Firm:
Takaya Koike