公开(公告)号：JP2003101779A

公开(公告)日：2003-04-04

申请号：JP2002194034

申请日：2002-07-03

Applicant: IBM

Inventor： TRELEWICZ JENNIFER QUIRIN ,  DITTRICH DANIELLE K ,  QIAO YUE ,  THOMPSON GERHARD ROBERT ,  WU CHAI WAH

IPC: B41J2/52 ,  G06K15/02 ,  H04N1/405

Abstract: PROBLEM TO BE SOLVED: To provide technique to realize digital half tone which controls a spot function in order to cope with gear noise, printer stress and general printing quality. SOLUTION: A method for forming spots to be used for realizing half tone includes a step for defining a spot function combining two functions which are selected in order to provide a prescribed spot form to be used in a half tone cell, and a step for scaling the spot function by using a scaling function which changes in accordance with values of a first spot function ordinate and a second spot function ordinate. By using asymmetrical modulation of the spot function, contact of adjacent spots is controlled, and a form of the spot accompanied by a gray region is changed.

公开(公告)号：JP2004229284A

公开(公告)日：2004-08-12

申请号：JP2004008548

申请日：2004-01-15

Applicant: Internatl Business Mach Corp ,  インターナショナル・ビジネス・マシーンズ・コーポレーションInternational Business Maschines Corporation

Inventor： DITTRICH DANIELLE K ,  ERNST LARRY M

IPC: B41J2/52 ,  H04N1/387 ,  H04N1/40 ,  H04N1/405

CPC classification number: H04N1/40068 ,  H04N1/405

Abstract: PROBLEM TO BE SOLVED: To provide an image processing method and apparatus for enhancing the quality of a printed image without degrading performance or throughput of an entire printer by simulating two-bit pel printing on a bi-level printer using intelligent double dotting.
SOLUTION: The bi-level printer prints a 2N dpi 1-bit/pel image through intelligent double dotting to enhance the quality of a half resolution rendered image to approach a print quality as if the image is rendered at full resolution. In one embodiment, an enhanced resolution mode which uses a bi-level printer's 1,200 dpi mode to print 600 dpi, two bit/pel images, results in an image having higher resolution quality than rendering the image using traditional halftone methods at either 600 dpi or 1,200 dpi. An image enhancement method through higher order resolution multiplication is also disclosed.
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