Clustered halftone dot design process

Details Clustered halftone dot design process Clustered halftone dot design process

1998-07-14

1999-11-02

Rogers, Scott

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358457, 358459, 358460, 358535, 358536, 382237, 382270, G06K 1502, G06T 500, H04N 1405, H04N 152

Patent

active

059785560

ABSTRACT:
An idealized clustered screen is characterized spot clustering which is optimized so that clusters are about the same size and shape as they grow and are approximately equally distanced though an image. Pixels are swapped within the screen to vary its appearance. An optimization process iteratively checks a quality metric based on the optimum conditions, as pixels are swapped until an optimum screen appearance is obtained.

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Eschbach et al, "Binarization using a two-dimensional pulse-density modulation"; J.Opt. Soc.Am.A; vol. 4, No. 10, Oct. 1987; pp. 1873-1878.
Eschbach; "Pulse-density modulcation on rastered media: combining pulse-density modulation and error diffusion"; J.Opt. Soc.Am.A; vol. 7, No. 4, Apr. 1990; pp. 708-716.

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