DE3783542D1 - Verfahren zur erzeugung eines graustufenbildes. - Google Patents

Verfahren zur erzeugung eines graustufenbildes.

Info

Publication number
DE3783542D1
DE3783542D1 DE8787307532T DE3783542T DE3783542D1 DE 3783542 D1 DE3783542 D1 DE 3783542D1 DE 8787307532 T DE8787307532 T DE 8787307532T DE 3783542 T DE3783542 T DE 3783542T DE 3783542 D1 DE3783542 D1 DE 3783542D1
Authority
DE
Germany
Prior art keywords
producing
gray scale
gray
scale
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 - Lifetime
Application number
DE8787307532T
Other languages
English (en)
Other versions
DE3783542T2 (de
Inventor
Gary J Dispoto
Larry R Mather
John D Meyer
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.)
Hewlett Packard Development Co LP
Original Assignee
Hewlett Packard 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 Hewlett Packard Co filed Critical Hewlett Packard Co
Application granted granted Critical
Publication of DE3783542D1 publication Critical patent/DE3783542D1/de
Publication of DE3783542T2 publication Critical patent/DE3783542T2/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04N1/4055—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)
  • Color, Gradation (AREA)
  • Dot-Matrix Printers And Others (AREA)
DE8787307532T 1986-08-25 1987-08-25 Verfahren zur erzeugung eines graustufenbildes. Expired - Lifetime DE3783542T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/899,358 US4680645A (en) 1986-08-25 1986-08-25 Method for rendering gray scale images with variable dot sizes

Publications (2)

Publication Number Publication Date
DE3783542D1 true DE3783542D1 (de) 1993-02-25
DE3783542T2 DE3783542T2 (de) 1993-07-22

Family

ID=25410846

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8787307532T Expired - Lifetime DE3783542T2 (de) 1986-08-25 1987-08-25 Verfahren zur erzeugung eines graustufenbildes.

Country Status (5)

Country Link
US (1) US4680645A (de)
EP (1) EP0260020B1 (de)
JP (1) JPS6359536A (de)
DE (1) DE3783542T2 (de)
HK (1) HK118493A (de)

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US6072592A (en) * 1991-08-13 2000-06-06 Megadot Systems Limited Method and apparatus for preparing color screens in a halftone image
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US5337160A (en) * 1992-07-01 1994-08-09 Hewlett-Packard Error diffusion processor and method for converting a grey scale pixel image to a binary value pixel image
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US5520989A (en) * 1992-12-07 1996-05-28 Avery Dennison Corporation Recyclable print-tinted paper
US5508826A (en) * 1993-04-27 1996-04-16 Lloyd; William J. Method and apparatus for calibrated digital printing using a four by four transformation matrix
US5469515A (en) * 1993-05-03 1995-11-21 Lin; Qian Halftone image formation using dither matrix generated based upon printed symbol models
US5557304A (en) * 1993-05-10 1996-09-17 Compaq Computer Corporation Spot size modulatable ink jet printhead
JP3171993B2 (ja) * 1993-05-24 2001-06-04 キヤノン株式会社 画像処理方法及び装置
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US5621546A (en) * 1993-11-02 1997-04-15 Xerox Corporation Method and apparatus for vector error diffusion with output color control
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DE69511470T2 (de) 1994-06-15 1999-12-16 Compaq Computer Corp., Houston Verfahren und Druckkopf zur Erzeugung von Gradiententondarstellungen
US5557709A (en) * 1994-07-01 1996-09-17 Seiko Epson Corporation Method and apparatus for dither array generation to reduce artifacts in halftoned images
US5684932A (en) * 1994-07-01 1997-11-04 Seiko Epson Corporation Method and apparatus for dither array generation to reduce artifacts in halftoned image data utilizing ink reduction processing
JPH0846784A (ja) * 1994-07-27 1996-02-16 Brother Ind Ltd 画像処理装置
US5426519A (en) * 1994-08-25 1995-06-20 Xerox Corporation Method and apparatus for implementing accurate angle screens
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Also Published As

Publication number Publication date
DE3783542T2 (de) 1993-07-22
EP0260020A3 (en) 1989-09-27
EP0260020A2 (de) 1988-03-16
JPS6359536A (ja) 1988-03-15
US4680645A (en) 1987-07-14
HK118493A (en) 1993-11-12
EP0260020B1 (de) 1993-01-13

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8327 Change in the person/name/address of the patent owner

Owner name: HEWLETT-PACKARD CO. (N.D.GES.D.STAATES DELAWARE),

8327 Change in the person/name/address of the patent owner

Owner name: HEWLETT-PACKARD DEVELOPMENT CO., L.P., HOUSTON, TE