Gamma correcting processing of video signals
CA 2119087 C · Owner: Callway, Edward George · Inventors: Callway, Edward George; Lum, Sanford S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a method of processing video signals comprised of gamma correcting pixel data of a first signal gamma correcting pixel data of a second signal adding the gamma corrected first and second signals to form a sum signal dividing the sum signal by a factor to form a processed signal and reverse gamma correcting the processed signal whereby merged pixel data is produced for generation of a display.
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 15, 1994 and granted June 1, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 15, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 15, 2016.
- 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.