Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1993-03-17
1994-01-11
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358136, H04N 7133
Patent
active
052786463
ABSTRACT:
An improved technique for decoding wherein the number of coefficients to be included in each sub-block is selectable, and a code indicating the number of coefficients within each layer is inserted in the bitstream at the beginning of each encoded video sequence. This technique allows the original runs of zero coefficients in the highest resolution layer to remain intact by forming a sub-block for each scale from a selected number of coefficients along a continuous scan. These sub-blocks may be decoded in a standard fashion, with an inverse discrete cosine transform applied to square sub-blocks obtained by the appropriate zero padding of and/or discarding of excess coefficients from each of the scales. This technique further improves decoding efficiency by allowing an implicit end of block signal to separate blocks, making it unnecessary to decode an explicit end of block signal in most cases.
REFERENCES:
patent: 4179709 (1979-12-01), Workman
patent: 4633296 (1986-12-01), Cham et al.
patent: 4920414 (1990-04-01), Remus et al.
patent: 4924309 (1990-05-01), Hartnack et al.
Civanlar Mehmet R.
Puri Atul
AT&T Bell Laboratories
Britton Howard W.
Lee Richard
Marley Robert P.
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