Image compression and expansion device

Details Image compression and expansion device Image compression and expansion device

1997-08-28

2000-04-04

Tran, Phuoc

Image analysis

Image compression or coding

Transform coding

251239, 251233, G06K 946, G06K 936

Patent

active

060470895

ABSTRACT:
The image compression and expansion device comprises a DCT processing unit in which original image data is subjected to a two-dimensional discrete cosine transformation to obtain DCT coefficients, a quantization process unit in which original image data is quantized by a first quantization table to obtain quantized DCT coefficients and a compression processing unit in which the quantized DCT coefficients are encoded to generate compressed image data. The compressed image data and the first quantization tables are recorded in a recording medium. A second quantization table is also stored in the recording medium. The image expansion device has a switch by which one of the first or second quantization table can be selected. An image is, thereby, reproduced from the compressed image data by using the selected type of quantization table.

REFERENCES:
patent: 5357584 (1994-10-01), Yamaoka
patent: 5497246 (1996-03-01), Abe
patent: 5517327 (1996-05-01), Nakatanti et al.
patent: 5666209 (1997-09-01), Abe
patent: 5850484 (1998-12-01), Beretta et al.
patent: 5883979 (1999-03-01), Beretta et al.

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