Method and apparatus for background determination and subtraction for a monocular vision system
CA 2176726 A1 · Owner: Minnesota Mining And Manufacturing Company · Inventors: Brady, Mark J.; Cerny, Darin G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for producing a background image from a plurality of images of a scene and for subtracting a background image from an input image are described. A background image is produced by dividing an image (40) into subimages (42), acquiring reference subimages (48) for each subimage location and comparing subsequent subimages with the reference subimage to determine if my objects have passed between the reference subimage and the video camera (22) that acquired images. When objects have passed between the reference subimage and the video camera (22), the reference subimage is designated as background and stored in a background image (50). Background portions of an input image …
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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 November 23, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 23, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 23, 2016.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.