Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-07-02
1993-10-12
Chin, Tommy
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358135, 358136, H04N 7133, H04N 7137
Patent
active
052530558
ABSTRACT:
An improved technique for efficient frequency scaling 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 coding efficiency by allowing an implicit end of block signal to separate blocks, making it unnecessary to transmit an explicit end of block signal in most cases.
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International Standards Organization Committee Draft 11172-2, "Coding of Moving Pictures and Associated Audio for Digital Storage Media at up to about 1.5 Mbit/s," Nov. 1991.
"Video Coding Using the MPEG-1 Compression Standard," A. Puri, Proceedings of the Society for Information Display 92, May 1992, Boston.
Civanlar Mehmet R.
Puri Atul
AT&T Bell Laboratories
Chin Tommy
Lee Richard
Marley Robert P.
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