Apparatus and method for predicting subjective quality of compressed images
CA 2173341 C · Owner: Bell Communications Research, Inc. · Inventors: Judd, Thomas Helm
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus and method are described for predicting a subjective quality rating associated with a reference image compressed at a given level. My apparatus includes means for and my method includes steps of, storing a digitized color image representing a reference image in memory (110) and compressing (120 620) at a given level and decompressing (130 630) the reference image to produce a, processed image. My apparatus and method also entail converting the reference image and the processed image each to a grayscale image (140, 640, and 740) and dividing each grayscale image into an array of blocks (150 650, and 750). My apparatus and method further entail generating a first intensity …
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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 October 6, 1994 and granted March 25, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 6, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 6, 2016.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.