Method and apparatus for generating a texture mapped perspective view
CA 2038426 C · Owner: Snodgrass, Thomas D. · Inventors: Cousens, James A.; Dawson, John F.; Snodgrass, Thomas D.
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 providing a texture mapped perspective view for digital map systems. The system includes apparatus for storing elevation data (10), apparatus for storing texture data (24) apparatus for scanning a projected view volume (12) from the elevation data storing apparatus apparatus, for processing (14), apparatus for generating a plurality of planar polygons and apparatus (34) for rendering images. The processing apparatus further includes apparatus for receiving the scanned projected view volume from the scanning apparatus transforming the scanned projected view volume from object space to screen space, and computing surface normals at each vertex of each polygon so as …
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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 8, 1991 and granted July 2, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 8, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 8, 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.