System and method of reducing aliasing in printed images

Details System and method of reducing aliasing in printed images System and method of reducing aliasing in printed images

2005-09-13

2005-09-13

Bella, Matthew C. (Department: 2676)

Computer graphics processing and selective visual display system

Computer graphics processing

Attributes

C345S596000, C345S618000, C345S656000, C345S657000, C345S658000, C358S001100, C358S003170, C358S003300, C358S534000, C358S536000, C382S260000, C382S266000, C382S269000, C382S296000

Reexamination Certificate

active

06943808

ABSTRACT:
The system and method reduces aliasing which is formed by the patterns that are introduced by the halftone screens used in the printer. The system and method provides halftone-specific anti-alias filters for obtaining optimal effective resolution in printed images. A method of reducing aliasing in a digital image includes providing a digital image; selecting a halftone screen for halftoning the digital image, wherein the halftone screen has a directional component associated with it; filtering the digital image with an antialiasing filter, the antialiasing filter having been designed to have a directional frequency response that is optimized for the directional component of the selected halftone screen; and halftoning the filtered digital image.

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Franklin C. Crow, “A Comparison of Antialiasing Techniques”, IEEE Computer Graphics and Applications, New York, vol. 1, No. 1, Jan. 1981, pp. 40-48.
Paul A. Delabastita, “Recent Trends in digital halftoning”, Proceedings of the SPIE, Bellingham, Virginia, vol. 2949, Oct. 7, 1996, pp. 318-331.
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