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1. (WO1992010905) METHOD AND APPARATUS FOR HALFTONE RENDERING OF A GRAY SCALE IMAGE USING A BLUE NOISE MASK
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1992/010905 International Application No.: PCT/US1991/008820
Publication Date: 25.06.1992 International Filing Date: 03.12.1991
Chapter 2 Demand Filed: 17.06.1992
IPC:
G06T 3/40 (2006.01) ,H04N 1/40 (2006.01) ,H04N 1/405 (2006.01) ,H04N 1/41 (2006.01)
G PHYSICS
06
COMPUTING; CALCULATING; COUNTING
T
IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
3
Geometric image transformation in the plane of the image, e.g. from bit-mapped to bit-mapped creating a different image
40
Scaling of a whole image or part thereof
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
N
PICTORIAL COMMUNICATION, e.g. TELEVISION
1
Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
40
Picture signal circuits
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
N
PICTORIAL COMMUNICATION, e.g. TELEVISION
1
Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
40
Picture signal circuits
405
Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
N
PICTORIAL COMMUNICATION, e.g. TELEVISION
1
Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
41
Bandwidth or redundancy reduction
Applicants:
RESEARCH CORPORATION TECHNOLOGIES, INC. [US/US]; 6840 East Broadway Boulevard Tucson, AZ 85710-2815, US
Inventors:
PARKER, Kevin, J.; US
MITSA, Theophano; US
Agent:
GREENBAUM, Michael, C.; Wigman & Cohen Suite 200 Crystal Square 3 1735 Jefferson Davis Highway Arlington, VA 22202, US
Priority Data:
622,05604.12.1990US
Title (EN) METHOD AND APPARATUS FOR HALFTONE RENDERING OF A GRAY SCALE IMAGE USING A BLUE NOISE MASK
(FR) PROCEDE ET APPAREIL POUR RENDRE EN DEMI-TEINTE UNE IMAGE D'ECHELLE DE GRIS A L'AIDE D'UN MASQUE DE BRUIT DE BLEU
Abstract:
(EN) A method of and system for rendering a halftone image of a gray scale image (500) by utilizing a pixel-by-pixel comparison (402) of the gray scale image against a blue noise mask (502) is disclosed in which the gray scale image is scanned on a pixel-by-pixel basis and compared on a pixel-by-pixel basis to an array of corresponding data points contained in a blue noise mask stored in a PROM (406) or computer memory in order to produce the desired halftoned image. Both digital and optically implemented halftone methods are disclosed. Application specific modifications of the blue noise mask as well as its use for producing hafltoned color images are also disclosed.
(FR) Procédé et système pour rendre une image en demi-teinte d'une image d'échelle de gris (500). Selon ce procédé, on utilise la comparaison (402) pixel par pixel de l'image de l'échelle de gris par rapport à un masque (502) de bruit de bleu. L'image d'échelle de gris est explorée pixel par pixel et comparée pixel par pixel à un réseau de points de données correspondants contenus dans un masque de bruit de bleu stocké dans une mémoire morte programmable (406) ou une mémoire d'ordinateur, afin de produire l'image en demi-teinte désirée. L'invention concerne à la fois des procédés de production d'images en demi-teinte numériques et optiques. L'on décrit également des modifications du masque de bruit de bleu spécifiques aux applications ainsi qu'à l'utilisation dudit masque aux fins de production d'images couleur en demi-teinte.
Designated States: AU, CA, FI, JP, KP, NO
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, MC, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0560872CA2231816CA2231818CA2231820CA2097508AU1991090884