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Browse Prior Art Database


IP.com Disclosure Number: IPCOM000027684D
Original Publication Date: 1998-Oct-31
Included in the Prior Art Database: 2004-Apr-08

Publishing Venue

Xerox Disclosure Journal


US Patent 5,469,267 to Wang discloses a system of mathematically characterizing any kind of halftone pattern. In the scheme of this patent, any image containing halftones is characterized as comprising a large number of square cells. Each of these cells is considered to have, at one comer thereof, a location where a halftone dot is possibly centered. Under this scheme, only seven types of cells could possibly exist, and any kind of halftone pattern, such as created by a digital printer, could be characterized as a combination of any number of these seven types of cells. This characterization scheme, as explained in the patent, enables relatively quick and simple techniques for analyzing halftone patterns obtained in various ways, and can be used to calibrate digital printers.