Code manipulation for a high speed JPEG decoder

Facsimile and static presentation processing – Facsimile – Reduced time or bandwidth for static image communication

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

358426, 382250, H04N 141

Patent

active

056548060

ABSTRACT:
A circuit for decoding one non-zero JPEG encoded pixel per clock cycle, the coded word being of variable length. For a pixel with leading zeros, a two stage pipeline is used, the first stage having one adder for calculating an delta value between the smallest number the variable length portion could be and the actual value, the second stage being an adder for adding the delta value to a base address to generate an address for a look up table, the output being the decoded value. This takes two clock periods to decode a pixel having at least one leading zero. For the Huffman code portion of encoded pixels with no leading zero's, only ten versions of which exist, a gate array for each is provided. Each detects one version and outputs the decoded Huffman code data in one clock cycle. A multiplexer then either selects the decoded data with no leading zero's in one clock cycle or the data with at least one leading zero in two clock cycles.

REFERENCES:
patent: 5157488 (1992-10-01), Pennebaker
patent: 5379070 (1995-01-01), Retter et al.
patent: 5497246 (1996-03-01), Abe
patent: 5535290 (1996-07-01), Allen
patent: 5588075 (1996-12-01), Chiba et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Code manipulation for a high speed JPEG decoder does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Code manipulation for a high speed JPEG decoder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Code manipulation for a high speed JPEG decoder will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1078797

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.