Graphics processing apparatus for smoothing edges of images

Details Graphics processing apparatus for smoothing edges of images Graphics processing apparatus for smoothing edges of images

1992-07-16

1994-10-18

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 54, G06K 900

Patent

active

053575830

ABSTRACT:
A graphics processing apparatus includes a first detection part for detecting, with respect to each pixel of an image, whether or not an edge of the image starts on a scanline, and for setting a control data depending on whether or not the edge starts on the scanline, a second detection part for detecting a duration of beam power modulation corresponding to one or plural edge pixels being intersected by a line defined in the image, and for setting a duration data, a third detection part for detecting an outermost edge pixel in the edge pixels, a part for generating a beam power data indicating an intensity level of light beam power corresponding to the outermost edge pixel, an output part for outputting the image by means of a printer having a light source for emitting a light beam, and a control means for continuously modulating light beam power of the light source from the intensity level to a predetermined level with respect to the edge pixels, so that an image with smooth edges is generated by modulating the light beam power of the light source in accordance with the control data and the duration data.

REFERENCES:
patent: 4975785 (1990-12-01), Kantor
patent: 5005139 (1991-04-01), Tung
patent: 5029227 (1991-07-01), Kawamura
Franklin C. Crow, "A Comparison of Antialiasing Techniques," IEEE CG & A, vol. 1, No. 1, pp. 40-48.

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