Adaptive buffer/quantizer control for transform video coders
CA 2050102 C · Owner: Hang, Hsueh-Ming · Inventors: Hang, Hsueh-Ming
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Adaptive Buffer/Quantizer Control, for Transform Video Coders Abstract, A buffer/quantizer controller in a video coder utilizes the average quantization step size employed for the previous frame the average number of bits, produced per pel by the video coder for the image contained in the previous frame and the current frame buffer fullness level to obtain an indication of image complexity. A target current frame quantization step size be employed by the video coder in encoding a current frame is based on the indication of image complexity. Optionally, the target frame quantization step size is adjusted by amapping procedure at predetermined intervals within each frame period to account, …
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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 28, 1991 and granted February 22, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 28, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 28, 2013.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.