WO1991010312A3 - Suppression de faux contours de densite au moyen de probabilites aleatoires enregistrees entrainant des decisions d'impression/non impression - Google Patents

Suppression de faux contours de densite au moyen de probabilites aleatoires enregistrees entrainant des decisions d'impression/non impression Download PDF

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Publication number
WO1991010312A3
WO1991010312A3 PCT/US1990/007389 US9007389W WO9110312A3 WO 1991010312 A3 WO1991010312 A3 WO 1991010312A3 US 9007389 W US9007389 W US 9007389W WO 9110312 A3 WO9110312 A3 WO 9110312A3
Authority
WO
WIPO (PCT)
Prior art keywords
print
sub
decisions
cell
stored random
Prior art date
Application number
PCT/US1990/007389
Other languages
English (en)
Other versions
WO1991010312A2 (fr
Inventor
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 JP91503259A priority Critical patent/JPH04505088A/ja
Publication of WO1991010312A2 publication Critical patent/WO1991010312A2/fr
Publication of WO1991010312A3 publication Critical patent/WO1991010312A3/fr

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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

Abstract

On obtient un faux contour d'une image en demi-teintes analysée sans inclure davantage de sous-éléments dans chaque cellule, sans augmenter les dimensions de chaque cellule ni diminuer la fréquence d'analyse de l'image, en attribuant à chaque sous-élément séquentiel d'une cellule en demi-teinte une probabilité pondéré d'être ''branché'' ('ON') en fonction de la valeur du signal d'entrée associé. Le signal de probabilité pondéré est converti en une valeur binaire, sans un générateur de nombres aléatoires en temps réel, par un dispositif de mémorisation ayant une pluralité de rangées, où chaque rangée représente une probabilité différente qu'un sous-élément soit ''branché''. Les rangées sont sollicitées sur la base de la probabilité pondérée qu'un sous-élément soit ''branché''.
PCT/US1990/007389 1990-01-02 1990-12-20 Suppression de faux contours de densite au moyen de probabilites aleatoires enregistrees entrainant des decisions d'impression/non impression WO1991010312A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP91503259A JPH04505088A (ja) 1990-01-02 1990-12-20 印刷／非印刷決定を形成するために記憶確率を用いた偽濃度輪郭抑制

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/459,497 US4945422A (en) 1990-01-02 1990-01-02 False density contour suppression using stored random probabilities to form print/no-print decisions
US459,497 1990-01-02

Publications (2)

Publication Number Publication Date
WO1991010312A2 WO1991010312A2 (fr) 1991-07-11
WO1991010312A3 true WO1991010312A3 (fr) 1991-08-22

Family

ID=23825030

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1990/007389 WO1991010312A2 (fr) 1990-01-02 1990-12-20 Suppression de faux contours de densite au moyen de probabilites aleatoires enregistrees entrainant des decisions d'impression/non impression

Country Status (4)

Country Link
US (1) US4945422A (fr)
EP (1) EP0461249A1 (fr)
JP (1) JPH04505088A (fr)
WO (1) WO1991010312A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JP2524470B2 (ja) * 1993-07-07 1996-08-14 日本電気株式会社 ディジタルハ―フト―ンスクリ―ン生成方法および装置
DE19826986C2 (de) 1998-06-18 2003-03-27 Heidelberger Druckmasch Ag Verfahren zur Kalibrierung von Bildaufzeichnungsgeräten
US7116447B2 (en) * 2002-05-24 2006-10-03 Eastman Kodak Company Halftone dot-growth technique using a dot edge-detection scheme

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2105144A (en) * 1981-08-11 1983-03-16 Dainippon Screen Mfg A method and apparatus for making half-tone images
EP0270259A2 (fr) * 1986-12-04 1988-06-08 Quantel Limited Systèmes de traitement de signaux vidéo
EP0274196A1 (fr) * 1986-11-26 1988-07-13 Crosfield Electronics Limited Génération de reproductions en demi-teintes
US4959730A (en) * 1990-01-02 1990-09-25 Eastman Kodak Company False density contour suppression using randomly modified input signals for comparison to threshold values

Family Cites Families (1)

* 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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2105144A (en) * 1981-08-11 1983-03-16 Dainippon Screen Mfg A method and apparatus for making half-tone images
EP0274196A1 (fr) * 1986-11-26 1988-07-13 Crosfield Electronics Limited Génération de reproductions en demi-teintes
EP0270259A2 (fr) * 1986-12-04 1988-06-08 Quantel Limited Systèmes de traitement de signaux vidéo
US4959730A (en) * 1990-01-02 1990-09-25 Eastman Kodak Company False density contour suppression using randomly modified input signals for comparison to threshold values

Also Published As

Publication number Publication date
US4945422A (en) 1990-07-31
JPH04505088A (ja) 1992-09-03
EP0461249A1 (fr) 1991-12-18
WO1991010312A2 (fr) 1991-07-11

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