Improvement of Detection Performance in DWT-Based Image Watermarking under Specified False Positive Probability

Masayoshi NAKAMOTO  Kohei SAYAMA  Mitsuji MUNEYASU  Tomotaka HARANO  Shuichi OHNO  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E94-A    No.2    pp.661-670
Publication Date: 2011/02/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E94.A.661
Print ISSN: 0916-8508
Type of Manuscript: PAPER
Category: Digital Signal Processing
image watermarking,  discrete wavelet transform (DWT),  false positive probability,  analysis of detection performance,  

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For copyright protection, a watermark signal is embedded in host images with a secret key, and a correlation is applied to judge the presence of watermark signal in the watermark detection. This paper treats a discrete wavelet transform (DWT)-based image watermarking method under specified false positive probability. We propose a new watermarking method to improve the detection performance by using not only positive correlation but also negative correlation. Also we present a statistical analysis for the detection performance with taking into account the false positive probability and prove the effectiveness of the proposed method. By using some experimental results, we verify the statistical analysis and show this method serves to improve the robustness against some attacks.