CA2000705C - Methode d'autotypie numerique avec diffusion des erreurs - Google Patents

Methode d'autotypie numerique avec diffusion des erreurs

Info

Publication number
CA2000705C
CA2000705C CA 2000705 CA2000705A CA2000705C CA 2000705 C CA2000705 C CA 2000705C CA 2000705 CA2000705 CA 2000705 CA 2000705 A CA2000705 A CA 2000705A CA 2000705 C CA2000705 C CA 2000705C
Authority
CA
Canada
Prior art keywords
gray scale
values
pixel location
range function
detected gray
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
CA 2000705
Other languages
English (en)
Other versions
CA2000705A1 (fr
Inventor
John S. Bowers
Harry Bowers
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.)
Visual Edge Tech Inc
Original Assignee
Visual Edge Tech Inc
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 Visual Edge Tech Inc filed Critical Visual Edge Tech Inc
Publication of CA2000705A1 publication Critical patent/CA2000705A1/fr
Application granted granted Critical
Publication of CA2000705C publication Critical patent/CA2000705C/fr
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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Image Processing (AREA)
  • Color, Gradation (AREA)
CA 2000705 1988-10-14 1989-10-13 Methode d'autotypie numerique avec diffusion des erreurs Expired - Fee Related CA2000705C (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US25784388A 1988-10-14 1988-10-14
US257,843 1988-10-14

Publications (2)

Publication Number Publication Date
CA2000705A1 CA2000705A1 (fr) 1990-04-14
CA2000705C true CA2000705C (fr) 1999-09-14

Family

ID=22978004

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2000705 Expired - Fee Related CA2000705C (fr) 1988-10-14 1989-10-13 Methode d'autotypie numerique avec diffusion des erreurs

Country Status (2)

Country Link
CA (1) CA2000705C (fr)
WO (1) WO1990004234A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5172247A (en) * 1990-10-24 1992-12-15 Eastman Kodak Company High speed digital error diffusion process for continuous tone image-to-binary image conversion
CA2063879C (fr) * 1991-05-28 1998-05-05 Albert D. Edgar Methode a reaction positive pour diffuser les erreurs contenues dans les signaux
JP3603906B2 (ja) * 1994-04-15 2004-12-22 富士写真フイルム株式会社 画像信号２値化処理装置および方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0031247B1 (fr) * 1979-12-20 1984-03-14 Cambridge Consultants Limited Dispositif et procédé pour la fabrication d'une image demi-ton se composant de points dispersés à partir d'une image sans graduation
US4345313A (en) * 1980-04-28 1982-08-17 Xerox Corporation Image processing method and apparatus having a digital airbrush for touch up
US4651287A (en) * 1984-06-14 1987-03-17 Tsao Sherman H Digital image processing algorithm for output devices with discrete halftone gray scale capability
US4578713A (en) * 1984-07-20 1986-03-25 The Mead Corporation Multiple mode binary image processing
JPS6163893A (ja) * 1984-09-06 1986-04-02 株式会社日立製作所 デイスプレイ装置における擬似中間調画像の表示方法
US4654721A (en) * 1985-04-12 1987-03-31 International Business Machines Corporation System for reproducing multi-level digital images on a bi-level printer of fixed dot size
US4680645A (en) * 1986-08-25 1987-07-14 Hewlett-Packard Company Method for rendering gray scale images with variable dot sizes

Also Published As

Publication number Publication date
CA2000705A1 (fr) 1990-04-14
WO1990004234A1 (fr) 1990-04-19

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