Anti-aliasing for digital printing with dot shape modulation and

Details Anti-aliasing for digital printing with dot shape modulation and Anti-aliasing for digital printing with dot shape modulation and

1997-01-03

1998-11-24

Rogers, Scott

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358459, 358298, 347240, 347131, 347254, H04N 123, H04N 1405, G06K 1502

Patent

active

058419560

ABSTRACT:
A method of reducing the effects of aliasing. Pixels are divided into phases, such that a phase or combination of phases may be printed to provide one of a number of dot shapes for each pixel. When a pixel is partly overlapped by an object to be printed, that pixel's dot shape is determined by determining which dot shape is the best geometrical match with the overlap. (FIGS. 3 and 7). Then, a greyscale value is determined for the selected dot shape by determining what greyscale will provide an effective greyscale that substantially corresponds to the percent of overlap by the object with the pixel. An alternative method selects a greyscale value for each phase rather than for the entire dot shape.

REFERENCES:
patent: 5461410 (1995-10-01), Venkateswar et al.
patent: 5461411 (1995-10-01), Florence et al.
James D. Foley, et al., "Antialiasing", Computer Graphics Priniples and Practice, 2nd ed. (1990) pp. 132-140.

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