Human visual model for data hiding
CA 2426459 A1 · Owner: Matsushita Electric Industrial Co. Ltd. · Inventors: Wu, Min; Yu, Hong Heather
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus of hiding identification data (12) in visual media. When image or video data is received, frequency masking (14) is performed to divide the image or video data into blocks of smooth regions and blocks of nonsmooth regions and to obtain preliminary just-noticeable-difference. Edge detection is performed to divide the non-smooth region of the image or video data into texture blocks and edge blocks (16). The image or video data is then adjusted by applying different strength of watermark in association with the type of each block.
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 17, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 17, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 17, 2023.
- 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.