Image processing with anti-forgery provision
CA 2090753 C · Owner: Nishikawa, Eiichi · Inventors: Nishikawa, Eiichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A discriminating circuit discriminates the degree of similarity between an image represented by an input image signal and a predetermined specific image. A CPU outputs a pattern-level selecting signal based upon the results of discrimination performed by the discriminating circuit. A pattern adding circuit modulates an internally stored specific pattern in accordance with an added-color designating signal and pattern-level selecting signal produced by the CPU and, adds the modulated specific pattern to the image signal. As a result a pattern specific to the apparatus is added in a reliably identifiable manner to an image output having a high probability of containing the specific original. …
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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 24, 1993 and granted September 28, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 24, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 24, 2015.
- 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.