Additional information embedding method, additional information detecting method, additional information embedding apparatus and additional information detecting apparatus
CA 2299123 A1 · Owner: Hitachi, Ltd. · Inventors: Yoshiura, Hiroshi; Kimura, Hiroyuki; Sugaya, Kazumi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus and method for embedding additional information embeds plural pieces of additional information on a signal as electronic watermark information. In detail plural, pieces of additional information to be embedded on a signal are generated, the additional information is converted into electronic watermark information, the sizes of embedding parts for respective electronic watermark information are defined under control and, the electronic watermark information is embedded on the signal based on the control signal. Therefore the additional, information are embedded so that additional information having a higher significance degree can be more reliably and rapidly detected.
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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 February 22, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 22, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 22, 2022.
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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.