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1. (WO1991007843) NON-GRAY SCALE ANTI-ALIASING METHOD FOR LASER PRINTERS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/007843 International Application No.: PCT/US1990/006555
Publication Date: 30.05.1991 International Filing Date: 08.11.1990
Chapter 2 Demand Filed: 04.06.1991
IPC:
G06K 15/02 (2006.01) ,G06K 15/12 (2006.01)
G PHYSICS
06
COMPUTING; CALCULATING; COUNTING
K
RECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
15
Arrangements for producing a permanent visual presentation of the output data
02
using printers
G PHYSICS
06
COMPUTING; CALCULATING; COUNTING
K
RECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
15
Arrangements for producing a permanent visual presentation of the output data
02
using printers
12
by photographic printing
Applicants:
LASERMASTER CORPORATION [US/US]; 7156 Shady Oak Road Eden Prairie, MN 55344, US
Inventors:
GILBERT, John, Mark; US
LUKIS, Lawrence, J.; US
STEIDEL, Leonard, R.; US
Agent:
PEDERSEN, Brad, D. ; Patterson & Keough 730 Second Avenue South 615 Peavey Building Minneapolis, MN 55402, US
Priority Data:
434,31813.11.1989US
Title (EN) NON-GRAY SCALE ANTI-ALIASING METHOD FOR LASER PRINTERS
(FR) PROCEDE ANTI-CRENELAGE DE L'ECHELLE DES NON-GRIS POUR IMPRIMANTES A LASER
Abstract:
(EN) A non-gray scale anti-aliasing method for smoothing the horizontal components of the edges of an image to be printed by a laser printer having unequal pixel resolutions in the horizontal and vertical dimensions is accomplished by selectively modifying the on and off states of pixels on either side of each vertical transition point along the horizontal components of raster lines representing the edges of the pixel representation of the image. A processor is provided with an ideal outline of the image and rasterizes the ideal outline of the image to determine which pixels to turn on and which pixels to turn off in a frame buffer that stores a pixel representation of the image to be printed by the laser printer. The modified pixel representation in the frame buffer is then communicated to the laser printer such that the laser printer may print the smoothed image.
(FR) Procédé anti-crénelage de l'échelle des non-gris permettant de lisser les composants horizontaux des bords d'une image devant être imprimée par une imprimante à laser ayant des résolutions de pixel inégales selon les dimensions horizontales et verticales. Il s'applique par modification sélective des états d'activation et de non-activation des pixels de chaque côté du point de transition verticale le long des composants horizontaux des lignes de la trame qui représentent les bords de la représentation en pixels d'une image. Un processeur est pourvu du contour idéal de l'image et trame le contour idéal de l'image de manière à déterminer quels pixels sont à activer et lesquels sont à désactiver dans un tampon mémoire d'image tampon qui stocke une représentation en pixels de l'image à imprimer par l'imprimante à laser. La représentation en pixels modifiée dans le tampon mémoire d'image est ensuite communiquée à l'imprimante à laser de sorte que celle-ci puisse imprimer l'image lissée.
Designated States: AU, BR, CA, FI, JP, KR, NO, SU
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
FI922153NO19921862EP0500697US5122884US5212559JPH05501527
CA2068528KR1019920704490AU1990067361