Image compression
CA 2077060 A1 · Owner: Parker, Sheppard H. · Inventors: Polk, Darryl R.; Parker, Sheppard H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus and method for improved Joint Photographic Experts Group (JPEG) decompression of image information is disclosed. A processor is used to parse image information into partially decompressed information a portion at a time. Then the processor or auxiliary digital signal processor identifies non-zero value dimensions for each block of partially decompressed information and decompresses each of the blocks of partially decompressed information based on the non-zero value dimensions of the information. Finally the processor is employed to store, and/or display the decompressed information. The decompression steps include parsing, Huffman decoding, run length decoding, unzigzagging …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed August 27, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 27, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 27, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.