Dithering masks with very large periods

Details Dithering masks with very large periods Dithering masks with very large periods

1997-11-21

2000-07-11

Lee, Thomas D.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358456, 358457, 382237, H04N 140

Patent

active

060881232

ABSTRACT:
A method and apparatus for halftoning utilizes a truly aperiodic mask with memory requirements much smaller than the mask itself. The mask is constructed of several smaller compatible masks and a selector which selects between the smaller masks. In this way the computation of a large aperiodic mask is replaced by the computation of several much smaller masks. Using this technique, watermarks may be embedded for encrypting information in such a way that the quality of the image is not compromised.

REFERENCES:
patent: 4903147 (1990-02-01), Kanno et al.
patent: 5107349 (1992-04-01), Ng et al.
patent: 5734752 (1998-03-01), Knox
patent: 5867607 (1999-02-01), Shibuya et al.

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