Watermarking
CA 2368136 A1 · Owner: Mason, Andrew James · Inventors: Mason, Andrew James; Werner, Oliver Hartwig; Salmon, Richard Aubrey
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A watermarking system and method is proposed for still or moving pictures in which a watermark is embedded robustly and simply into DC-values but without , causing unacceptable visible picture degradation. The watermark is secure and can be readily detected, and the method can be used to convey additional data. Also disclosed is a method for watermarking a sequence of pictures in which the visibility of artifacts is reduced. The watermark may carry data and may be used to label a programme.
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 March 20, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 20, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 20, 2022.
- 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.