WO1990005423A3 - Procede et appareil de production d'images numeriques a demi-teintes - Google Patents

Procede et appareil de production d'images numeriques a demi-teintes Download PDF

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Publication number
WO1990005423A3
WO1990005423A3 PCT/US1989/004997 US8904997W WO9005423A3 WO 1990005423 A3 WO1990005423 A3 WO 1990005423A3 US 8904997 W US8904997 W US 8904997W WO 9005423 A3 WO9005423 A3 WO 9005423A3
Authority
WO
WIPO (PCT)
Prior art keywords
halftone
screen
color
signal processor
screens
Prior art date
Application number
PCT/US1989/004997
Other languages
English (en)
Other versions
WO1990005423A2 (fr
Inventor
Craig Louis Surbrook
Original Assignee
Seecolor Corp
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=23025213&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1990005423(A3) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Seecolor Corp filed Critical Seecolor Corp
Priority to EP90901135A priority Critical patent/EP0442971B1/fr
Priority to DE68924271T priority patent/DE68924271D1/de
Publication of WO1990005423A2 publication Critical patent/WO1990005423A2/fr
Publication of WO1990005423A3 publication Critical patent/WO1990005423A3/fr

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
    • H04N1/4058—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
    • 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
    • H04N1/46—Colour picture communication systems
    • H04N1/52—Circuits or arrangements for halftone screening

Abstract

Appareil et procédés de production de négatifs tramés de similigravure à demi-teintes (séparations chromatiques) à partir de signaux d'intensité de tonalités continues produits par un lecteur optique (12). Un processeur de signaux numériques (10) traite les valeurs d'intensité de tonalités continues afin de créer des cartes mémoire (18-6, 18-7, 18-8 et 18-10) qui, en combinaison avec un organe de sortie de données numériques (34) (par exemple une imprimante laser ou une photocomposeuse usuelle), produisent les négatifs tramés de similigravure à demi-teintes désirés. Lorsqu'on produit des négatifs tramés à demi-teintes dont l'orientation de trame ne diffère essentiellement pas de 90° (par exemple, les orientations de trame de 90°, 105° et 75° relatives aux séparations chromatiques jaune, cyan et magenta en quadrichromie à demi-teintes habituelle), le processeur de signaux numériques (10) utilise une matrice de juxtaposition de points de couleur différente (Fig. 4), destinée à produire chaque point de simili dans le lignage de trame désiré du négatif tramé à demi-teintes correspondant. Lorsqu'on produit des négatifs tramés à demi-teintes dont l'orientation de trame est essentiellement différente de 90° (par exemple, l'orientation de trame de 45° utilisée pour la séparation chromatique du noir de simili en quadrichromie à demi-teintes habituelle), le processeur de signaux numériques (10) utilise une matrice de juxtaposition de points de couleur différente qui positionne correctement les points de simili du négatif tramé à demi-teintes correspondant et établit, en outre, le lignage de trame désiré.
PCT/US1989/004997 1988-11-08 1989-11-08 Procede et appareil de production d'images numeriques a demi-teintes WO1990005423A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP90901135A EP0442971B1 (fr) 1988-11-08 1989-11-08 Procede de production d'images numeriques a demi-teintes
DE68924271T DE68924271D1 (de) 1988-11-08 1989-11-08 Verfahren zur digitalen erzeugung gerasteter halbtöne.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/268,951 US4924301A (en) 1988-11-08 1988-11-08 Apparatus and methods for digital halftoning
US268,951 1988-11-08

Publications (2)

Publication Number Publication Date
WO1990005423A2 WO1990005423A2 (fr) 1990-05-17
WO1990005423A3 true WO1990005423A3 (fr) 1990-07-12

Family

ID=23025213

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1989/004997 WO1990005423A2 (fr) 1988-11-08 1989-11-08 Procede et appareil de production d'images numeriques a demi-teintes

Country Status (7)

Country Link
US (2) US4924301A (fr)
EP (1) EP0442971B1 (fr)
JP (1) JPH04501644A (fr)
AT (1) ATE127992T1 (fr)
AU (1) AU4744390A (fr)
DE (1) DE68924271D1 (fr)
WO (1) WO1990005423A2 (fr)

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WO2017054852A1 (fr) * 2015-09-29 2017-04-06 Hewlett-Packard Indigo B.V. Écrans en demi-teinte
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JPH04501644A (ja) 1992-03-19
WO1990005423A2 (fr) 1990-05-17
EP0442971B1 (fr) 1995-09-13
ATE127992T1 (de) 1995-09-15
US5166809A (en) 1992-11-24
EP0442971A1 (fr) 1991-08-28
US4924301A (en) 1990-05-08
DE68924271D1 (de) 1995-10-19
AU4744390A (en) 1990-05-28

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