Clustered aperiodic mask

Details Clustered aperiodic mask Clustered aperiodic mask

1997-10-03

1999-06-29

Lee, Thomas D.

Image analysis

Image compression or coding

Gray level to binary coding

382205, 358456, 358457, G06K 936, G06K 946, H04N 140

Patent

active

059179511

ABSTRACT:
A technique combines most of the advantages of both blue noise and clustering in generating a clustered aperiodic mask and using it in a dither array algorithm for halftoning. The method of halftoning of grey scale images utilizes a pixel-by-pixel comparison of the image against a clustered aperiodic mask in which the clustered aperiodic mask is comprised of a partly random and partly deterministic single valued function which is designed to produce visually pleasing dot configurations when thresholded at any level of grey.

REFERENCES:
patent: 5111310 (1992-05-01), Parker et al.
patent: 5602943 (1997-02-01), Velho et al.

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