Robust Wavelet-Based Watermarking Using Dynamic Strength Factor
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abstract
In unsecured network environments, ownership protection of digital contents,
such as images, is becoming a growing concern. Different watermarking methods
have been proposed to address the copyright protection of digital materials.
Watermarking methods are challenged with conflicting parameters of
imperceptibility and robustness. While embedding a watermark with a high
strength factor increases robustness, it also decreases imperceptibility of the
watermark. Thus embedding in visually less sensitive regions, i.e., complex
image blocks could satisfy both requirements. This paper presents a new
wavelet-based watermarking technique using an adaptive strength factor to
tradeoff between watermark transparency and robustness. We measure variations
of each image block to adaptively set a strength-factor for embedding the
watermark in that block. On the other hand, the decoder uses the selected
coefficients to safely extract the watermark through a voting algorithm. The
proposed method shows better results in terms of PSNR and BER in comparison to
recent methods for attacks, such as Median Filter, Gaussian Filter, and JPEG
compression.
