Method and apparatus for image descreening
CA 2331354 A1 · Owner: Karidi, Ron D. · Inventors: Karidi, Ron D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An image descreening process first smoothes the image where smoothing is , accomplished by applying a convolution with a low pass filter (LPF) kernel which is a parameter to the descreening function. Using the smoothed image a , determination is made for each pixel for which pixels around it participate in the modified filter. For a current pixel a window is considered having the , size of the LPF kernel with the current pixel at the center. A threshold T1 which is given as a parameter, is used to mark the pixels in the current window. Considering a pixel in the window if for all color components the , difference between this pixel value to the center pixel value is less than T1 in …
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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 July 1, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 1, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 1, 2021.
- 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.