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Proceedings Paper

Digital watermarking in wavelet domain with predistortion for authenticity verification and localization
Author(s): Dominque Albert Winne; Henry D. Knowles; David R. Bull; Cedric Nishan Canagarajah
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Paper Abstract

In this paper, we present a blind fragile authentication algorithm by modifying a robust algorithm. The embedding process modifies the relative position of one wavelet coefficient from a vector of 3 coefficients. The introduced distortion of the watermarking system is reduced by a content dependent quantization parameter. This parameter refines the quantization step according to the magnitude of the coefficients in the vector. The smallest wavelet coefficients in the smooth areas of the image are pre-distorted to improve the performance and efficiency of the algorithm in these areas. This pre-distortion does not visually degrade the image as the introduced high frequency noise is evenly distributed over these areas. A dichotomous detector compares the extracted and embedded watermark on a bit by bit basis. This results in a high detection resolution, which can deliver information about the shape of the modified object. Embedding of the watermark with a larger redundancy increases the robustness of the system to additive white Gaussian noise attack. A weighted estimation then extracts the embedded watermark. This technique is fully described in the paper. Experimental results of this system embedded in the wavelet domain illustrate the performance and effectiveness compared with other reported fragile watermarking methods.

Paper Details

Date Published: 29 April 2002
PDF: 8 pages
Proc. SPIE 4675, Security and Watermarking of Multimedia Contents IV, (29 April 2002); doi: 10.1117/12.465292
Show Author Affiliations
Dominque Albert Winne, Univ. of Bristol (United Kingdom)
Henry D. Knowles, Univ. of Bristol (United Kingdom)
David R. Bull, Univ. of Bristol (United Kingdom)
Cedric Nishan Canagarajah, Univ. of Bristol (United Kingdom)

Published in SPIE Proceedings Vol. 4675:
Security and Watermarking of Multimedia Contents IV
Edward J. Delp III; Ping Wah Wong, Editor(s)

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