WO1991010313A3 - False density contour suppression using randomly modified input signals for comparison to threshold values - Google Patents

False density contour suppression using randomly modified input signals for comparison to threshold values Download PDF

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Publication number
WO1991010313A3
WO1991010313A3 PCT/US1990/007391 US9007391W WO9110313A3 WO 1991010313 A3 WO1991010313 A3 WO 1991010313A3 US 9007391 W US9007391 W US 9007391W WO 9110313 A3 WO9110313 A3 WO 9110313A3
Authority
WO
WIPO (PCT)
Prior art keywords
comparison
input signals
threshold values
modified input
randomly modified
Prior art date
Application number
PCT/US1990/007391
Other languages
French (fr)
Other versions
WO1991010313A2 (en
Inventor
Hwai-Hzuu Tai
Yee S Ng
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
Priority to JP91503260A priority Critical patent/JPH04505089A/en
Priority to DE69020727T priority patent/DE69020727T2/en
Priority to EP91903074A priority patent/EP0461250B1/en
Publication of WO1991010313A2 publication Critical patent/WO1991010313A2/en
Publication of WO1991010313A3 publication Critical patent/WO1991010313A3/en

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)

Abstract

False contouring of a screened halftone image without including more sub-elements in each cell, increasing the size of each cell, or decreasing the screen frequency of the image is accomplished by assigning to each sequential sub-element of a halftone cell a weighted probability of being 'ON' in accordance with the value of the associated input signal.
PCT/US1990/007391 1990-01-02 1990-12-20 False density contour suppression using randomly modified input signals for comparison to threshold values WO1991010313A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP91503260A JPH04505089A (en) 1990-01-02 1990-12-20 False density contour suppression using stochastically modified input signals for comparison with thresholds
DE69020727T DE69020727T2 (en) 1990-01-02 1990-12-20 Faulty density contour suppression that uses randomly modified input signals for comparison with threshold values.
EP91903074A EP0461250B1 (en) 1990-01-02 1990-12-20 False density contour suppression using randomly modified input signals for comparison to threshold values

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
US459,496 1990-01-02

Publications (2)

Publication Number Publication Date
WO1991010313A2 WO1991010313A2 (en) 1991-07-11
WO1991010313A3 true WO1991010313A3 (en) 1991-08-22

Family

ID=23825024

Family Applications (1)

Application Number Title Priority Date Filing Date
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

Country Status (5)

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

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 (en) * 1996-06-12 2005-10-19 富士写真フイルム株式会社 Gradation correction image data creation method, gradation correction halftone data creation method, gradation correction threshold data creation method, and image output apparatus
DE102006035254A1 (en) * 2006-07-26 2008-01-31 Francotyp-Postalia Gmbh Printout producing method for use in franking machine, involves determining whether pixels are produced using plausibilities and random generator, and producing pixels during subsequent printing step depending on result of determination
EP2171683A1 (en) * 2007-06-29 2010-04-07 Thomson Licensing Apparatus and method for reducing artifacts in images
EP2774361B1 (en) 2011-11-01 2015-09-16 Dolby Laboratories Licensing Corporation Adaptive false contouring prevention in layered coding of images with extended dynamic range

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4245258A (en) * 1979-11-05 1981-01-13 Xerox Corporation Method and apparatus for reduction of false contours in electrically screened images
GB2105144A (en) * 1981-08-11 1983-03-16 Dainippon Screen Mfg A method and apparatus for making half-tone images
EP0274196A1 (en) * 1986-11-26 1988-07-13 Crosfield Electronics Limited Generating half-tone representations

Family Cites Families (3)

* 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
JPS58114570A (en) * 1981-12-26 1983-07-07 Canon Inc Picture output system
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4245258A (en) * 1979-11-05 1981-01-13 Xerox Corporation Method and apparatus for reduction of false contours in electrically screened images
GB2105144A (en) * 1981-08-11 1983-03-16 Dainippon Screen Mfg A method and apparatus for making half-tone images
EP0274196A1 (en) * 1986-11-26 1988-07-13 Crosfield Electronics Limited Generating half-tone representations

Also Published As

Publication number Publication date
DE69020727D1 (en) 1995-08-10
JPH04505089A (en) 1992-09-03
EP0461250A1 (en) 1991-12-18
WO1991010313A2 (en) 1991-07-11
DE69020727T2 (en) 1996-03-07
EP0461250B1 (en) 1995-07-05
US4959730A (en) 1990-09-25

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