Apparatus and method for encoding halftone and line copy data
CA 1113402 A · Owner: Xerox Corporation · Inventors: Stoffel, James C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A system for encoding halftone and line copy data having an unknown screen frequency and/or angle is disclosed. The data in binary pixel form, is inputted to multiple predictors each adapted to handle different types of imagery. The predictions made are compared with the established values for the pixels predicted and error signals generated. The error signals so produced are compared and the error signal with the least error is chosen for encoding.
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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
- Granted December 1, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 1, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.