Improved gradient based motion estimation
CA 2248111 C · Owner: Innovision Limited · Inventors: Borer, Timothy John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A technique for generating motion vectors in video and film signal processing using constraint equation based motion estimation. Simplifications of the processing and hardware are made possible by generating motion vectors based on the normalised constraint equation. The temporal and spatial image gradients are calculated using temporal and spatial differentiators (16 17, 18). An angle (.theta.) corresponding to the orientation of the spatial image gradient vector and the motion speed (vn) in the direction of the vector are calculated using apparatus including a rectangular to polar coordinate converter (32). .theta. and vn are the parameters of the normalised constraint equation.
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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 March 3, 1997 and granted June 17, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 3, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 3, 2019.
- 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.