WO1990006034A3 - Unite de serigraphie electronique d'arts graphiques supprimant les impressions moirees, utilisant une selection pseudo-aleatoire de caracteres - Google Patents

Unite de serigraphie electronique d'arts graphiques supprimant les impressions moirees, utilisant une selection pseudo-aleatoire de caracteres Download PDF

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Publication number
WO1990006034A3
WO1990006034A3 PCT/US1989/004939 US8904939W WO9006034A3 WO 1990006034 A3 WO1990006034 A3 WO 1990006034A3 US 8904939 W US8904939 W US 8904939W WO 9006034 A3 WO9006034 A3 WO 9006034A3
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WIPO (PCT)
Prior art keywords
dot
screener
fonts
pseudo
relatively smooth
Prior art date
Application number
PCT/US1989/004939
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English (en)
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WO1990006034A2 (fr
Inventor
Edward Maurice Granger
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 EP89912919A priority Critical patent/EP0444093B1/fr
Priority to DE68922312T priority patent/DE68922312T2/de
Publication of WO1990006034A2 publication Critical patent/WO1990006034A2/fr
Publication of WO1990006034A3 publication Critical patent/WO1990006034A3/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
    • H04N1/4058—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 with details for producing a halftone screen at an oblique angle

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Image Processing (AREA)
  • Color Image Communication Systems (AREA)

Abstract

L'invention concerne un appareil pour une unité de sérigraphie numérique (30) ainsi que des procédés utilisés conjointement avec ceux-ci, permettant de produire des points de demi-teinte relativement doux à sensiblement n'importe quel angle arbitraire de sérigraphie, et de supprimer une source de configurations moirées induites par l'unité de sérigraphie qui autrement apparaîtraient dans une image en couleur reproduite, créée par un moteur de marquage (20), basé sur un réseau. Spécifiquement, on crée des points relativement doux et on supprime ce moiré en variant de manière aléatoire les caractères des points utilisés pour écrire des points en demi-teinte successifs dans l'image sérigraphique. On utiise une valeur pseudo-aléatoire afin de sélectionner un caractère d'un certain nombre de caractères de points en demi-teinte, à titre d'illustration seize caractères. Chaque caractère de point peut prendre presque n'importe quelle configuration (forme) dans la mesure où elle est diffèrente de celle des autres caractères, à condition que les configurations de tous les caractères des points soient relativemnent douces, mis à part les irrégularités des limites normales des points dues à la quantification.
PCT/US1989/004939 1988-11-16 1989-11-13 Unite de serigraphie electronique d'arts graphiques supprimant les impressions moirees, utilisant une selection pseudo-aleatoire de caracteres WO1990006034A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP89912919A EP0444093B1 (fr) 1988-11-16 1989-11-13 Unite de serigraphie electronique d'arts graphiques supprimant les impressions moirees, utilisant une selection pseudo-aleatoire de caracteres
DE68922312T DE68922312T2 (de) 1988-11-16 1989-11-13 Elektronische vorrichtung zur halbtonrasterung graphischer vorlagen, die moiremuster unterdrückt, mit verwendung von pseudo-zufälliger zeichensatzauswahl.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US272,592 1988-11-16
US07/272,592 US4916545A (en) 1988-11-16 1988-11-16 Electronic graphic arts screener that suppresses Moire patterns using pseudo-random font selection

Publications (2)

Publication Number Publication Date
WO1990006034A2 WO1990006034A2 (fr) 1990-05-31
WO1990006034A3 true WO1990006034A3 (fr) 1990-07-12

Family

ID=23040452

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1989/004939 WO1990006034A2 (fr) 1988-11-16 1989-11-13 Unite de serigraphie electronique d'arts graphiques supprimant les impressions moirees, utilisant une selection pseudo-aleatoire de caracteres

Country Status (6)

Country Link
US (1) US4916545A (fr)
EP (1) EP0444093B1 (fr)
JP (1) JPH04503893A (fr)
AT (1) ATE121582T1 (fr)
DE (1) DE68922312T2 (fr)
WO (1) WO1990006034A2 (fr)

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JP3692693B2 (ja) * 1997-03-12 2005-09-07 コニカミノルタビジネステクノロジーズ株式会社 階調再現方法及び階調再現装置
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EP0141869B1 (fr) * 1983-11-14 1987-09-16 DR.-ING. RUDOLF HELL GmbH Procédé et appareil pour la fabrication de formes d'impression tramées

Also Published As

Publication number Publication date
DE68922312T2 (de) 1996-01-11
US4916545A (en) 1990-04-10
EP0444093B1 (fr) 1995-04-19
WO1990006034A2 (fr) 1990-05-31
EP0444093A1 (fr) 1991-09-04
DE68922312D1 (de) 1995-05-24
ATE121582T1 (de) 1995-05-15
JPH04503893A (ja) 1992-07-09

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