CA2000705A1 - Digital half-toning process with error diffusion - Google Patents

Digital half-toning process with error diffusion

Info

Publication number
CA2000705A1
CA2000705A1 CA 2000705 CA2000705A CA2000705A1 CA 2000705 A1 CA2000705 A1 CA 2000705A1 CA 2000705 CA2000705 CA 2000705 CA 2000705 A CA2000705 A CA 2000705A CA 2000705 A1 CA2000705 A1 CA 2000705A1
Authority
CA
Canada
Prior art keywords
error diffusion
digital half
toning process
toning
digital
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
Application number
CA 2000705
Other languages
French (fr)
Other versions
CA2000705C (en
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
Bowers Imaging Technologies 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 Bowers Imaging Technologies Inc filed Critical Bowers Imaging Technologies Inc
Publication of CA2000705A1 publication Critical patent/CA2000705A1/en
Application granted granted Critical
Publication of CA2000705C publication Critical patent/CA2000705C/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

Abstract

A digital half-toning process with error diffusion reduces visibly discernible artifacts. In the error diffusion process, a range function provides random factors which are used to spread errors to neighboring pixels.
CA 2000705 1988-10-14 1989-10-13 Digital half-toning process with error diffusion Expired - Fee Related CA2000705C (en)

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 true CA2000705A1 (en) 1990-04-14
CA2000705C CA2000705C (en) 1999-09-14

Family

ID=22978004

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2000705 Expired - Fee Related CA2000705C (en) 1988-10-14 1989-10-13 Digital half-toning process with error diffusion

Country Status (2)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5373455A (en) * 1991-05-28 1994-12-13 International Business Machines Corporation Positive feedback error diffusion signal processing

Families Citing this family (2)

* 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
JP3603906B2 (en) * 1994-04-15 2004-12-22 富士写真フイルム株式会社 Image signal binarization processing apparatus and method

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0031247B1 (en) * 1979-12-20 1984-03-14 Cambridge Consultants Limited Apparatus and method for generating a dispersed dot half tone picture from a continuous tone picture
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 (en) * 1984-09-06 1986-04-02 株式会社日立製作所 Display of false halftone image of display unit
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5373455A (en) * 1991-05-28 1994-12-13 International Business Machines Corporation Positive feedback error diffusion signal processing

Also Published As

Publication number Publication date
CA2000705C (en) 1999-09-14
WO1990004234A1 (en) 1990-04-19

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed