DE69020727D1 - Fehlerhafte dichtekonturunterdrückung, die zufallsmodifizierte eingangssignale für den vergleich mit schwellenwerten benutzt. - Google Patents

Fehlerhafte dichtekonturunterdrückung, die zufallsmodifizierte eingangssignale für den vergleich mit schwellenwerten benutzt.

Info

Publication number
DE69020727D1
DE69020727D1 DE69020727T DE69020727T DE69020727D1 DE 69020727 D1 DE69020727 D1 DE 69020727D1 DE 69020727 T DE69020727 T DE 69020727T DE 69020727 T DE69020727 T DE 69020727T DE 69020727 D1 DE69020727 D1 DE 69020727D1
Authority
DE
Germany
Prior art keywords
faulty
comparison
input signals
threshold values
modified input
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
DE69020727T
Other languages
English (en)
Other versions
DE69020727T2 (de
Inventor
Hwai-Hzuu Tai
Yee Ng
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
Application granted granted Critical
Publication of DE69020727D1 publication Critical patent/DE69020727D1/de
Publication of DE69020727T2 publication Critical patent/DE69020727T2/de
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
    • H04N1/4055—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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Image Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
DE69020727T 1990-01-02 1990-12-20 Fehlerhafte dichtekonturunterdrückung, die zufallsmodifizierte eingangssignale für den vergleich mit schwellenwerten benutzt. Expired - Fee Related DE69020727T2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/459,496 US4959730A (en) 1990-01-02 1990-01-02 False density contour suppression using randomly modified input signals for comparison to threshold values
PCT/US1990/007391 WO1991010313A2 (en) 1990-01-02 1990-12-20 False density contour suppression using randomly modified input signals for comparison to threshold values

Publications (2)

Publication Number Publication Date
DE69020727D1 true DE69020727D1 (de) 1995-08-10
DE69020727T2 DE69020727T2 (de) 1996-03-07

Family

ID=23825024

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69020727T Expired - Fee Related DE69020727T2 (de) 1990-01-02 1990-12-20 Fehlerhafte dichtekonturunterdrückung, die zufallsmodifizierte eingangssignale für den vergleich mit schwellenwerten benutzt.

Country Status (5)

Country Link
US (1) US4959730A (de)
EP (1) EP0461250B1 (de)
JP (1) JPH04505089A (de)
DE (1) DE69020727T2 (de)
WO (1) WO1991010313A2 (de)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4945422A (en) * 1990-01-02 1990-07-31 Eastman Kodak Company False density contour suppression using stored random probabilities to form print/no-print decisions
US5404411A (en) * 1990-12-27 1995-04-04 Xerox Corporation Bitmap-image pattern matching apparatus for correcting bitmap errors in a printing system
US5274472A (en) * 1992-05-21 1993-12-28 Xerox Corporation High addressability image generator using pseudo interpolation of video and screen data
US5233366A (en) * 1992-05-26 1993-08-03 Xerox Corporation Half-tone printing with thermal ink jet using random spot distribution in one dimension
US5313309A (en) * 1992-06-05 1994-05-17 Eastman Kodak Company Method and apparatus for printing halftones with a gray level printer with contour suppression and/or minimization of moire patterns
US5463720A (en) * 1992-09-28 1995-10-31 Granger; Edward M. Blue noise based technique for use in a halftone tile oriented screener for masking screener induced image artifacts
US6040876A (en) * 1995-10-13 2000-03-21 Texas Instruments Incorporated Low intensity contouring and color shift reduction using dither
JP3708222B2 (ja) * 1996-06-12 2005-10-19 富士写真フイルム株式会社 階調補正画像データ作成方法、階調補正網％データ作成方法、階調補正閾値データ作成方法および画像出力装置
DE102006035254A1 (de) * 2006-07-26 2008-01-31 Francotyp-Postalia Gmbh Verfahren und Anordnung zum Erzeugen eines Abdrucks
KR101350853B1 (ko) * 2007-06-29 2014-01-13 톰슨 라이센싱 이미지들에서 아티팩트들을 감소시키기 위한 장치 및 방법
CN103918274B (zh) 2011-11-01 2015-08-26 杜比实验室特许公司 对具有扩展动态范围的图像的分层编码中的自适应伪轮廓预防

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4184206A (en) * 1978-03-07 1980-01-15 Hughes Aircraft Company Subpixel X-Y coordinate encoding
US4245258A (en) * 1979-11-05 1981-01-13 Xerox Corporation Method and apparatus for reduction of false contours in electrically screened images
JPS5827147A (ja) * 1981-08-11 1983-02-17 Dainippon Screen Mfg Co Ltd 網目版作成方法
JPS58114570A (ja) * 1981-12-26 1983-07-07 Canon Inc 画像処理装置
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
GB8628238D0 (en) * 1986-11-26 1986-12-31 Crosfield Electronics Ltd Generating half-tone representations

Also Published As

Publication number Publication date
WO1991010313A2 (en) 1991-07-11
DE69020727T2 (de) 1996-03-07
US4959730A (en) 1990-09-25
EP0461250B1 (de) 1995-07-05
WO1991010313A3 (en) 1991-08-22
EP0461250A1 (de) 1991-12-18
JPH04505089A (ja) 1992-09-03

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee