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1. WO1996004747 - IMAGE DISPLAY USING IRREGULARLY PLACED CURVING STRUCTURES

Publication Number WO/1996/004747
Publication Date 15.02.1996
International Application No. PCT/IB1995/000590
International Filing Date 28.07.1995
Chapter 2 Demand Filed 13.02.1996
IPC
H04N 1/405 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
1Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
40Picture signal circuits
405Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
CPC
H04N 1/405
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
1Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
40Picture signal circuits
405Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
H04N 1/4051
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
1Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
40Picture signal circuits
405Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
4051producing a dispersed dots halftone pattern, the dots having substantially the same size
Applicants
  • THE HARLEQUIN GROUP LIMITED [GB/GB]; Barrington Hall Barrington Cambridge CB2 5RG, GB
Inventors
  • HALL, Daniel; GB
Agents
  • LIESEGANG, Roland; Boehmert & Boehmert, Nordemann & Partner Franz-Joseph-Strasse 38 D-80801 München, DE
Priority Data
08/283,02829.07.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) IMAGE DISPLAY USING IRREGULARLY PLACED CURVING STRUCTURES
(FR) AFFICHAGE D'IMAGE UTILISANT DES STRUCTURES EN SPIRALE DISPOSEES DE FAÇON IRREGULIERE
Abstract
(EN)
A method and apparatus for digital halftoning places curving structure centers at random locations within a halftone cell. Pixel illumination ordering is determined based on displacement from a pixel to a nearest CSC along a curving structure. Curving structures including spirals with varying numbers of arms, varying angles of departure, varying orientations, and varying other parameters are used to achieve visual aesthetics as desired.
(FR)
La présente invention concerne un procédé et un dispositif de gestion numérique de la demi-teinte qui place des centres de structures en spirale à des emplacements aléatoires à l'intérieur d'une cellule à gestion demi-teinte. L'ordonnancement de l'illumination des pixels est déterminé à partir du déplacement entre un pixel et le centre de structure en spirale le plus proche dans le sens de la structure en spirale. Par 'structures en spirale' on entend des spirales comportant un nombre variable de bras, des angles de départ variables, des orientations variables, et d'autres paramètres variables utilisés pour obtenir l'esthétique visuelle voulue.
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