Method, system and computer program product for optimization of data compression
CA 2738144 C · Owner: Slipstream Data Inc. · Inventors: Wang, Longji; Yang, En-Hui
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method, system and computer software product for improving rate-distortion performance while remaining faithful to JPEG/MPEG syntax involving joint optimization of Huffman tables quantization step sizes and quantized coefficients of a JPEG/MPEG encoder. This involves finding the optimal coefficient indices in the form of (run size) pairs. By employing an interative process including this search for optimal coefficient indices joint improvement of run-length coding Huffman coding and quantization table selection may be achieved. Additionally the compression of quantized DC coefficients may also be improved using a trellis-structure.
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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 25, 2004 and granted December 16, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 25, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 25, 2026.
- 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
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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.