Method and apparatus for halftoning and inverse halftoning and the transmission of such images
CA 2133558 C · Owner: Miceli, Christopher M. · Inventors: Parker, Kevin J.; Miceli, Christopher M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for obtaining the inverse halftone or gray scale image of a halftone image is disclosed in which the halftone image can be comprised of clustered dots or dispersed dots and it is not, necessary to have knowledge of the screening methods or parameter. This method involves adaptive run-length filtering over at least one of rows and colums and diagonals of said halftones. A method for transmitting and receiving a gray scale image in a compressed and decompressed manner, respectively, is also disclosed for efficient facsimile transmission of images. This method involves transmitting a local mean continuous tone image and an error image.
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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 April 9, 1993 and granted October 13, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 9, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 9, 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
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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.