Method for reduced bit-depth quantization
CA 2841701 C · Owner: Dolby International Ab · Inventors: Kerofsky, Louis Joseph
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus is provided for dequantization and inverse transformation of an image signal. The apparatus comprises a first receiver for receiving a plurality of quantized coefficient levels that define an image a second receiver for receiving a quantization paramater QP a first processor for determining a periodic mantissa portion depending on QP%P and P defines the period of the mantissa portion a second processor for determining an exponential portion depending on QP/P a third processor for computing reconstructed transform coefficients from the plurality of quantized coefficient levels the periodic mantissa portion and the exponential portion a fourth processor for performing an inverse …
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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 August 8, 2002 and granted June 30, 2015. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 8, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 8, 2024.
- 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.