Method and apparatus for compressing and decompressing image dat

Details Method and apparatus for compressing and decompressing image dat Method and apparatus for compressing and decompressing image dat

1996-01-30

1997-04-15

Tran, Thai Q.

Television

Bandwidth reduction system

Data rate reduction

348406, 348404, H04N 730, H04N 732

Patent

active

056214669

ABSTRACT:
The compressed image data ZZ includes code data representing a quantization level coefficient QCx inserted between block data units. DCT coefficients QF(u,v) and a quantization level coefficient QCx, which are decoded form the compressed image data ZZ, are multiplied in the inverse quantization table generator 250 to generate a quantization table QT, and the inverse quantization unit 250 executes inverse quantization with the quantization table QT. Since the quantization level coefficient QCx is inserted between block data units in the compressed image data, the quantization table QT is renewed every time when a new quantization level coefficient QCx is decoded. The compressed image data also includes a special type of data, or null run data, representing a series of pixel blocks having an identical image pattern.

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patent: 5253078 (1993-10-01), Backanski et al.
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patent: 5291282 (1994-03-01), Nakagana et al.
patent: 5295077 (1994-03-01), Fukuoka
patent: 5301040 (1994-04-01), Hoshi et al.

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