Image data processor using embedded data
CA 2219875 C · Owner: Nec Personal Computers, Ltd. · Inventors: Nakano, Hirotaka; Fujihara, Shiro; Okazaki, Fumihiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An encoder, which comprises a means 40 for embedding a specific electronic mark data in a characteristic part of an image converted to a spatial frequency area a, quantizing means 50 for quantizing the spatial frequency area data in which the electronic mark data is embedded and a variable length encoder 60 for variable length coding the quantizer output, outputs compression coded digital image data. A decoder comprises a variable length decoder 80 and reverse quantizer 90 for restoring compression encoded digital image data to spatial frequency area data, means 120 for detecting the electronic mark data from the restored data, and detection display means 130 for displaying the detection …
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 October 31, 1997 and granted March 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 31, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 31, 2019.
- 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.