Noise reduction in frame transmitted video signals
CA 2080086 A1 · Owner: Matsushita Electric Corporation Of America · Inventors: Boyce, Jill M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for reducing noise in a reference frame of video information by determining the mean absolute difference, MAD0, between each block in the reference frame and identically located blocks in adjacent frames. If MAD0 is < A, the block in an adjacent frame is held for averaging with the block in the reference frame, but if MAD0 for the block is > A a, search is made for a block in the adjacent frame that matches the block in the reference frame. This is labelled MADmin. If MAD0 for the block in the adjacent frame is < BMADmin, the matching block is not used in the average. If MAD0 is not < BMADmin, the matching block can be used in the average, but preferably this is not done if MADmin …
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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 7, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 7, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 7, 2014.
- 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.