SE9800686L - Screening with predicted grid plates - Google Patents

Screening with predicted grid plates

Info

Publication number
SE9800686L
SE9800686L SE9800686A SE9800686A SE9800686L SE 9800686 L SE9800686 L SE 9800686L SE 9800686 A SE9800686 A SE 9800686A SE 9800686 A SE9800686 A SE 9800686A SE 9800686 L SE9800686 L SE 9800686L
Authority
SE
Sweden
Prior art keywords
maps
screening
dots
grid plates
image
Prior art date
Application number
SE9800686A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE513365C2 (en
SE9800686D0 (en
Inventor
Fredrik Nilsson
Bjoern Kruse
Original Assignee
Forskarpatent I Linkoeping Ab
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Forskarpatent I Linkoeping Ab filed Critical Forskarpatent I Linkoeping Ab
Priority to SE9800686A priority Critical patent/SE513365C2/en
Publication of SE9800686D0 publication Critical patent/SE9800686D0/en
Priority to EP99908033A priority patent/EP1066716A1/en
Priority to PCT/SE1999/000282 priority patent/WO1999045697A1/en
Publication of SE9800686L publication Critical patent/SE9800686L/en
Publication of SE513365C2 publication Critical patent/SE513365C2/en

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
    • H04N1/4051—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a dispersed dots halftone pattern, the dots having substantially the same size

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Image Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Image Analysis (AREA)

Abstract

Halftoning method based on the use of pre-computed maps, one for each possible tone value in the image, at halftoning the image value at a specific position gives the map from which a pixel is copied into the halftone at the corresponding position. The maps with low or high densities have maximally spread minority dots but in intermediate maps a successive transition takes place from maximally spread dots to structured dot clusters of defined type for instance straight lines.
SE9800686A 1998-03-05 1998-03-05 Screening procedure based on calculated templates SE513365C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE9800686A SE513365C2 (en) 1998-03-05 1998-03-05 Screening procedure based on calculated templates
EP99908033A EP1066716A1 (en) 1998-03-05 1999-03-01 Halftoning with pre-computed maps
PCT/SE1999/000282 WO1999045697A1 (en) 1998-03-05 1999-03-01 Halftoning with pre-computed maps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9800686A SE513365C2 (en) 1998-03-05 1998-03-05 Screening procedure based on calculated templates

Publications (3)

Publication Number Publication Date
SE9800686D0 SE9800686D0 (en) 1998-03-05
SE9800686L true SE9800686L (en) 1999-09-06
SE513365C2 SE513365C2 (en) 2000-09-04

Family

ID=20410402

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9800686A SE513365C2 (en) 1998-03-05 1998-03-05 Screening procedure based on calculated templates

Country Status (3)

Country Link
EP (1) EP1066716A1 (en)
SE (1) SE513365C2 (en)
WO (1) WO1999045697A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7025515B2 (en) * 2003-05-20 2006-04-11 Software 2000 Ltd. Bit mask generation system
GB2419250C (en) 2004-10-18 2008-04-24 Software 2000 Ltd Bit mask generation system.
JP4757210B2 (en) 2007-02-09 2011-08-24 大日本スクリーン製造株式会社 Threshold matrix generation method, threshold matrix generation apparatus, and threshold matrix
WO2011053287A1 (en) * 2009-10-28 2011-05-05 Hewlett-Packard Development Company, L.P. Determining a layout of graphic objects according to a layout density map

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991012686A1 (en) * 1990-02-07 1991-08-22 Eastman Kodak Company Digital halftoning with correlated minimum visual modulation patterns
US5583660A (en) * 1990-09-14 1996-12-10 Minnesota Mining And Manufacturing Company Non-perpendicular, equal frequency non-conventional screen patterns for electronic halftone generation
US5276535A (en) * 1991-12-24 1994-01-04 Levien Raphael L Method and apparatus for halftoning of images using grayscale error diffusion
US5579457A (en) * 1994-07-29 1996-11-26 The Harlequin Group Ltd. Image display apparatus and method using irregularly placed curving structures
US5802212A (en) * 1996-02-09 1998-09-01 Seiko Epson Corporation Clustered-dot dither with white-fleck suppression

Also Published As

Publication number Publication date
SE513365C2 (en) 2000-09-04
SE9800686D0 (en) 1998-03-05
EP1066716A1 (en) 2001-01-10
WO1999045697A1 (en) 1999-09-10

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