Method and apparatus for improving vertical definition of a television signal by scan conversion
CA 2000294 A1 · Owner: Birch, Christopher Henry · Inventors: Birch, Christopher Henry
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Scan conversion apparatus for improving the vertical resolution of a television image for display comprises a field store for storing the previously transmitted field and a line store for storing video data representative of the previous line including the most recent picture element. In an interlaced system the two, vertically adjacent picture elements and the intermediate picture element transmitted in the previous field are used to provide five selectable values. The video data is also tested in accordance with three tests comprising a rank ordering test a vertically sharp, transition test and a motion test. According to the results of these tests, one of the five alternative values is …
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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 October 6, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 6, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 6, 2011.
- 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
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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.