System and method for a multiresolution transform of digital image information
CA 2250973 A1 · Owner: Meadows, Henry E. · Inventors: Meadows, Henry E.; Bonneau, Robert J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Digital image data is compressed by a technique combining the advantages of both wavelet and fractal encoding. The technique produces an encoded image which can be efficiently matched to other compressed images in order to identify the image being processed. The encoding technique spatially decimates the images (201) at numerous frequency scales produced by wavelet transformations and forms blocks comprising of groups of pixels at each frequency scale (270, 272, 274). The average modulus and angle values of the data in each block are compared to the next higher scale (109). Each frequency scale is then encoded for the blocks which have corresponding matching blocks in the adjacent …
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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 April 3, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 3, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 3, 2019.
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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.