Digital video decompression system

Patent 4785349 Issued on November 15, 1988. Estimated Expiration Date:

October 5, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventors

Assignee

Technology Inc. 64

Application

No. 07/104131 filed on 10/05/1987

US Classes:

375/240.23Variable length coding

Examiners

Primary: Britton, Howard W.

Attorney, Agent or Firm

International Classes

G06T 9/00 (20060101)
H04N 7/36 (20060101)
H03M 7/42 (20060101)
H04N 9/804 (20060101)
H04N 11/04 (20060101)
H04N 7/32 (20060101)
H04N 9/806 (20060101)
H04N 5/926 (20060101)
H04N 5/84 (20060101)
H04N 5/85 (20060101)

Abstract

A full motion color digital video signal is compressed, formatted for transmission, recorded on compact disc media and decoded at conventional video frame rates. During compression, regions of a frame are individually analyzed to select optimum fill coding methods specific to each region. Region decoding time estimates are made to optimize compression thresholds. Region descriptive codes conveying the size and locations of the regions are grouped together in a first segment of a data stream. Region fill codes conveying pixel amplitude indications for the regions are grouped together according to fill code type and placed in other segments of the data stream. The data stream segments are individually variable length coded according to their respective statistical distributions and formatted to form data frames. The number of bytes per frame is dithered by the addition of auxiliary data determined by a reverse frame sequence analysis to provide an average number selected to minimize pauses of the compact disc during playback thereby avoiding unpredictable seek mode latency periods characteristic of compact discs. A decoder includes a variable length decoder responsive to statistical information in the code stream for separately variable length decoding individual segments of the data stream. Region location data is derived from region descriptive data and applied with region fill codes to a plurality of region specific decoders selected by detection of the fill code type (e.g., relative, absolute, dyad and DPCM) and decoded region pixels are stored in a bit map for subsequent display.

Other References

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