CA2217555A1 - Clustered halftone dot design process - Google Patents
Clustered halftone dot design processInfo
- Publication number
- CA2217555A1 CA2217555A1 CA002217555A CA2217555A CA2217555A1 CA 2217555 A1 CA2217555 A1 CA 2217555A1 CA 002217555 A CA002217555 A CA 002217555A CA 2217555 A CA2217555 A CA 2217555A CA 2217555 A1 CA2217555 A1 CA 2217555A1
- Authority
- CA
- Canada
- Prior art keywords
- screen
- halftone dot
- design process
- clustered
- pixels
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
- H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
- H04N1/4055—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern
Abstract
ABSTRACT OF THE DISCLOSURE
An idealized clustered screen is characterized spot clustering which is optimized so that clusters are about the same size and shape as they grow and are approximately equally distanced though an image. Pixels are swapped within the screen to vary its appearance. An optimization process iteratively checks a quality metric based on the optimum conditions, as pixels are swapped until an optimum screen appearance is obtained.
An idealized clustered screen is characterized spot clustering which is optimized so that clusters are about the same size and shape as they grow and are approximately equally distanced though an image. Pixels are swapped within the screen to vary its appearance. An optimization process iteratively checks a quality metric based on the optimum conditions, as pixels are swapped until an optimum screen appearance is obtained.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/749,306 | 1996-11-14 | ||
US08/749,306 US5787238A (en) | 1996-11-14 | 1996-11-14 | Clustered halftone dot design process |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2217555A1 true CA2217555A1 (en) | 1998-05-14 |
CA2217555C CA2217555C (en) | 2002-01-22 |
Family
ID=25013184
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002217555A Expired - Fee Related CA2217555C (en) | 1996-11-14 | 1997-10-07 | Clustered halftone dot design process |
Country Status (5)
Country | Link |
---|---|
US (2) | US5787238A (en) |
EP (1) | EP0843462A3 (en) |
JP (1) | JPH10164366A (en) |
BR (1) | BR9705655A (en) |
CA (1) | CA2217555C (en) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6020978A (en) * | 1997-09-30 | 2000-02-01 | Lexmark International, Inc. | Method and apparatus for color halftoning using interlocked threshold arrays |
US6356363B1 (en) | 1997-09-30 | 2002-03-12 | Lexmark International, Inc. | Method for halftoning using interlocked threshold arrays or interlocked dot profiles |
KR100275690B1 (en) * | 1997-12-29 | 2000-12-15 | 윤종용 | Image processing apparatus using mask |
US6252679B1 (en) * | 1998-11-18 | 2001-06-26 | Xerox Corporation | Composite halftone screens with stochastically distributed clusters or lines |
JP3411843B2 (en) * | 1998-12-28 | 2003-06-03 | パナソニック コミュニケーションズ株式会社 | MFP |
US7092119B1 (en) * | 1999-08-20 | 2006-08-15 | International Business Machines Corporation | Method, system, and program for managing calibration files in a printing system |
JP3427026B2 (en) * | 1999-12-24 | 2003-07-14 | 大日本スクリーン製造株式会社 | Halftone dot forming method and apparatus |
US6775029B1 (en) | 2000-10-30 | 2004-08-10 | Xerox Corporation | Method for efficient calibration of printing devices |
US7088473B2 (en) * | 2001-02-26 | 2006-08-08 | Sony Corporation | System and method for effectively implementing a dither matrix for an electronic printer device |
US6724501B2 (en) | 2001-06-22 | 2004-04-20 | Hewlett-Packard Development Company, L.P. | Apparatus and method for dither matrix design for color halftoning using dispersed dot clusters |
US7025515B2 (en) * | 2003-05-20 | 2006-04-11 | Software 2000 Ltd. | Bit mask generation system |
US7239429B2 (en) * | 2003-05-29 | 2007-07-03 | Seiko Epson Corporation | Method and apparatus for generating dispersed cluster screen |
US7446904B2 (en) * | 2004-05-28 | 2008-11-04 | Infoprint Solutions Company, Llc | Methods and apparatus for generating dither mask through interpolation between preferred patterns |
GB2419250C (en) * | 2004-10-18 | 2008-04-24 | Software 2000 Ltd | Bit mask generation system. |
US7616347B2 (en) * | 2005-04-29 | 2009-11-10 | International Business Machines Corporation | System and method for multi-bit halftoning |
US7626730B2 (en) | 2006-03-31 | 2009-12-01 | Eastman Kodak Company | Method of making a multilevel halftone screen |
US8934142B2 (en) * | 2013-04-30 | 2015-01-13 | Hewlett-Packard Indigo B.V. | Halftone screen |
US9811923B2 (en) | 2015-09-24 | 2017-11-07 | Snaptrack, Inc. | Stochastic temporal dithering for color display devices |
CN112468791B (en) * | 2020-11-25 | 2021-08-27 | 北京理工大学 | Light intensity measurement iterative imaging method based on single-pixel detection |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4149194A (en) * | 1977-07-07 | 1979-04-10 | Xerox Corporation | Variable angle electronic halftone screening |
ATE14164T1 (en) * | 1981-09-12 | 1985-07-15 | Hell Rudolf Dr Ing Gmbh | PROCESS FOR THE MANUFACTURE OF PRINTING FORMES USING IRREGULARLY DISTRIBUTED PRINTING POINTS. |
US4752822A (en) * | 1983-03-08 | 1988-06-21 | Canon Kabushiki Kaisha | Color halftone image processing apparatus producing various screen angles and having an adaptive color image data conversion look-up table and a small-capacity masking memory |
DE3634939A1 (en) * | 1986-10-14 | 1988-04-28 | Du Pont Deutschland | METHOD FOR RECORDING QUASI HALFTONE IMAGES |
JPH02145085A (en) * | 1988-11-25 | 1990-06-04 | Fuji Xerox Co Ltd | Film picture reader |
US5341228A (en) * | 1990-12-04 | 1994-08-23 | Research Corporation Technologies | Method and apparatus for halftone rendering of a gray scale image using a blue noise mask |
US5442461A (en) * | 1991-09-03 | 1995-08-15 | Levien; Raphael L. | Screen generation for halftone screening of images with reduction of irrational correction artifacts |
EP0597596A3 (en) * | 1992-10-15 | 1994-06-15 | Digital Equipment Corp | Imaging system with translated input levels. |
US5317418A (en) * | 1993-05-11 | 1994-05-31 | Hewlett-Packard Company | Halftone images using special filters |
US5394252A (en) * | 1994-03-02 | 1995-02-28 | Xerox Corporation | Hybrid quantization method for color document reproduction |
US5673121A (en) * | 1996-06-17 | 1997-09-30 | Xerox Corporation | Stochastic halftoning screening method |
-
1996
- 1996-11-14 US US08/749,306 patent/US5787238A/en not_active Expired - Lifetime
-
1997
- 1997-10-07 CA CA002217555A patent/CA2217555C/en not_active Expired - Fee Related
- 1997-10-31 JP JP9300311A patent/JPH10164366A/en not_active Abandoned
- 1997-11-04 EP EP97308834A patent/EP0843462A3/en not_active Withdrawn
- 1997-11-13 BR BR9705655A patent/BR9705655A/en not_active IP Right Cessation
-
1998
- 1998-07-14 US US09/114,833 patent/US5978556A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US5978556A (en) | 1999-11-02 |
CA2217555C (en) | 2002-01-22 |
JPH10164366A (en) | 1998-06-19 |
US5787238A (en) | 1998-07-28 |
EP0843462A3 (en) | 2003-05-21 |
BR9705655A (en) | 1999-03-16 |
EP0843462A2 (en) | 1998-05-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |