GB2294174B - Post modulation gray scale error diffusion based method of unified document image rendering - Google Patents

Post modulation gray scale error diffusion based method of unified document image rendering

Info

Publication number
GB2294174B
GB2294174B GB9520882A GB9520882A GB2294174B GB 2294174 B GB2294174 B GB 2294174B GB 9520882 A GB9520882 A GB 9520882A GB 9520882 A GB9520882 A GB 9520882A GB 2294174 B GB2294174 B GB 2294174B
Authority
GB
United Kingdom
Prior art keywords
gray scale
document image
based method
error diffusion
image rendering
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.)
Expired - Fee Related
Application number
GB9520882A
Other languages
English (en)
Other versions
GB2294174A (en
GB9520882D0 (en
Inventor
Hwai Tzuu Tai
Thomas Joseph Wetzel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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 Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of GB9520882D0 publication Critical patent/GB9520882D0/en
Publication of GB2294174A publication Critical patent/GB2294174A/en
Application granted granted Critical
Publication of GB2294174B publication Critical patent/GB2294174B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • H04N1/4052—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 by error diffusion, i.e. transferring the binarising error to neighbouring dot decisions
    • H04N1/4053—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 by error diffusion, i.e. transferring the binarising error to neighbouring dot decisions with threshold modulated relative to input image data or vice versa
    • 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
    • H04N1/4057—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 the pattern being a mixture of differently sized sub-patterns, e.g. spots having only a few different diameters

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Image Processing (AREA)
GB9520882A 1994-10-14 1995-10-12 Post modulation gray scale error diffusion based method of unified document image rendering Expired - Fee Related GB2294174B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US32439794A 1994-10-14 1994-10-14
US32317194A 1994-10-14 1994-10-14

Publications (3)

Publication Number Publication Date
GB9520882D0 GB9520882D0 (en) 1995-12-13
GB2294174A GB2294174A (en) 1996-04-17
GB2294174B true GB2294174B (en) 1998-08-26

Family

ID=26983806

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9520882A Expired - Fee Related GB2294174B (en) 1994-10-14 1995-10-12 Post modulation gray scale error diffusion based method of unified document image rendering

Country Status (2)

Country Link
DE (1) DE19536108A1 (de)
GB (1) GB2294174B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19745498C2 (de) * 1997-10-15 2000-12-07 Agfa Gevaert Ag Verfahren und Vorrichtung zum Kopieren einer transparenten Vorlage auf lichtempfindliches Material

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2273017A (en) * 1992-11-26 1994-06-01 Samsung Electronics Co Ltd Colour error diffusion dependent on neighbouring pixel gradation
EP0630149A1 (de) * 1993-06-21 1994-12-21 Nec Corporation Verfahren und Gerät zur Bildverarbeitung
EP0650288A1 (de) * 1993-10-20 1995-04-26 Canon Kabushiki Kaisha Genaue Bildtypunterscheidung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2273017A (en) * 1992-11-26 1994-06-01 Samsung Electronics Co Ltd Colour error diffusion dependent on neighbouring pixel gradation
EP0630149A1 (de) * 1993-06-21 1994-12-21 Nec Corporation Verfahren und Gerät zur Bildverarbeitung
EP0650288A1 (de) * 1993-10-20 1995-04-26 Canon Kabushiki Kaisha Genaue Bildtypunterscheidung

Also Published As

Publication number Publication date
DE19536108A1 (de) 1996-04-18
GB2294174A (en) 1996-04-17
GB9520882D0 (en) 1995-12-13

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20031012