Watermarking of dither halftoned images

Zachi Z. Baharav; Doron Shaked

doi:10.1117/12.344681

9 April 1999 Watermarking of dither halftoned images

Zachi Z. Baharav, Doron Shaked

Proceedings Volume 3657, Security and Watermarking of Multimedia Contents; (1999) https://doi.org/10.1117/12.344681
Event: Electronic Imaging '99, 1999, San Jose, CA, United States

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.

Citation Download Citation

Zachi Z. Baharav and Doron Shaked "Watermarking of dither halftoned images", Proc. SPIE 3657, Security and Watermarking of Multimedia Contents, (9 April 1999); https://doi.org/10.1117/12.344681

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