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Proceedings Paper

Watermarking of dither halftoned images
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Paper Abstract

Image watermarking concerns embedding information in images, in a manner that does not affect the visual quality of the image. This paper focusses on watermarking of dither halftone images. The basic idea is to use a sequence of two dither matrices (instead of one) to encode the watermark information. Analyzing a specific statistical model of input images, leads to an optimal decoding algorithm in term of the rate- distortion trade-off. Furthermore, we characterize optimal dither matrix pairs (i.e.: dither matrix pairs whose use results in the most favorable rate-distortion). Finally, the results are demonstrated in a synthetic example. The example is synthetic in the sense that it does not resort to printing and re-scanning of the image.

Paper Details

Date Published: 9 April 1999
PDF: 10 pages
Proc. SPIE 3657, Security and Watermarking of Multimedia Contents, (9 April 1999); doi: 10.1117/12.344681
Show Author Affiliations
Zachi Z. Baharav, Hewlett-Packard Co. (United States)
Doron Shaked, Hewlett Packard Labs. Israel (Israel)

Published in SPIE Proceedings Vol. 3657:
Security and Watermarking of Multimedia Contents
Ping Wah Wong; Edward J. Delp III, Editor(s)

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