Shading correction method, and apparatus therefor
CA 2097799 A1 · Owner: Awano, Naoshi · Inventors: Awano, Naoshi; Matsumoto, Toshihiko; Ijiri, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An image obtained by imaging an object having a solid shape, such as that of a circular column or prism develops a distribution in brightness since the angle of each portion of the surface of the object with respect to a lighting device and image pick-up-device differs depending upon the location. The distribution of brightness is substantially uniform along the longitudinal direction of the object but varies transversely of the object. One line is designated on the captured image of the object in a direction that cuts across the object, and the distribution of brightness on this line is obtained. A two-dimensional shading pattern is obtained by expanding this brightness distribution in the …
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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 29, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 29, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 2013.
- 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.