Chroma keyer color discriminator
CA 1237518 A · Owner: Ross Video Limited · Inventors: Skrydstrup, Ole
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Improved Chroma Keyer Color Discriminator Abstract, A chroma keyer color discriminator wherein orthogonal color difference signals B-Y and R-Y are rotated through an angle ? corresponding to a desired chroma keying signal where R and B are red and blue signals and Y is the luminance signal where Y = 0.3R + 0.59G + O.11B. The rotated signals (R-Y)' and (B-Y)' are processed to develop B'-G' and B'-R' signals to enhance the selectivity of the discriminator. Difference signals other than B-Y R-Y, B'-G', and, B'-R' may also be employed.
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
- Granted May 31, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 31, 2005.
- 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.