Method for compressing and extending an image by transforming orthogonally and encoding the image
CA 2088862 A1 · Owner: Hudson Soft Co. Ltd. · Inventors: Itagaki, Fumihiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Block distortion standards are obtained by considering the non-linearity of the visual sensation on stimulus, the non-linearity of illumination brightness versus voltage in an image display apparatus, the measurement of errors of lightness which is sensed on brightness stimulus by human beings the, discrimination threshold characteristic on lightness of the visual sensation, and brightness ruggedness. The brightness ruggedness is made proximate by brightness dispersion, so that a calculation cost is lowered.
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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 February 5, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 5, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 5, 2015.
- 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.