ERROR PROPAGATED IMAGE HALFTONING WITH TIME-VARYING PHASE SHIFT - Patent 0404933

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EP 0 404 933 A1

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(43)	Date of publication:
	02.01.1991 Bulletin 1991/01

(21)	Application number: 90902525.0

(22)	Date of filing: 12.01.1990

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International Patent Classification (IPC):

G06F 3/ 147^{( . )}
G09G 3/ 36^{( . )}
G09G 5/ 02^{( . )}

G09G 3/ 20^{( . )}
G09G 5/ 00^{( . )}

(86)	International application number:
	PCT/US1990/000268

(87)	International publication number:
	WO 1990/008377 (26.07.1990 Gazette 1990/17)

(84)	Designated Contracting States:
	DE FR GB

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Priority:

13.01.1989 US 19890297768

(71)	Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
	Armonk, NY 10504 (US)

(72)	Inventors:
	FEIGENBLATT, Ronald, I. Dobbs Ferry, NY 10522 (US) POWELL, Carl, G. Putnam Valley, NY 10579 (US)

(74)	Representative: Jost, Ottokarl, Dipl.-Ing.
	IBM Deutschland Informationssysteme GmbH Patentwesen und Urheberrecht Pascalstrasse 100 W-7000 Stuttgart 80 W-7000 Stuttgart 80 (DE)

(54)	ERROR PROPAGATED IMAGE HALFTONING WITH TIME-VARYING PHASE SHIFT