Non-gary scale anti-aliasing method for laser printers

Details Non-gary scale anti-aliasing method for laser printers Non-gary scale anti-aliasing method for laser printers

1989-11-13

1991-08-20

Reinhart, Mark J.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

346 11, 358296, H04N 121

Patent

active

050418483

ABSTRACT:
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 iamge 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.

REFERENCES:
patent: 4180854 (1979-12-01), Walden et al.
patent: 4682189 (1987-07-01), Purdy et al.

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