Wavelet-based image watermarking with visibility range estimation based on HVS and neural networks

Authors:
Hung-Hsu Tsai;Chi-Chih Liu
Affiliations:
Department of Information Management, National Formosa University, Huwei, Yunlin 632, Taiwan, ROC;Department of Information Management, National Formosa University, Huwei, Yunlin 632, Taiwan, ROC
Venue:
Pattern Recognition
Year:
2011

Citing 12
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Abstract

This work proposes a wavelet-based image watermarking (WIW) technique, based on the human visible system (HVS) model and neural networks, for image copyright protection. A characteristic of the HVS, which is called the just noticeable difference (JND) profile, is employed in the watermark embedding to enhance the imperceptibility of the technique. First, we derive the allowable visibility ranges of the JND thresholds for all coefficients of a wavelet-transformed image. The WIW technique exploits the ranges to compute the adaptive strengths to be superimposed in the wavelet coefficients while embedding watermarks. An artificial neural network (ANN) is then used to memorize the relationships between the original wavelet coefficients and its watermark version. Consequently, the trained ANN is utilized for estimating the watermark without the original image. Many existing schemes require the original image to be involved in the calculation of the JND profile of the image. Finally, computer simulations demonstrate that both transparency and robustness of the WIW technique are superior to that of other proposed methods.