The use of wavelets in digital watermarking has increased dramatically over the last decade replacing previously popular domains such as the Discrete Cosine Transform (DCT) and the Discrete Fourier Transform (DFT). The main reason for this relates to several advantages which wavelets offer over these domains, such as better energy compaction and efficiency of computation. The Discrete Wavelet Transform (DWT) however suffers from some disadvantages, it lacks directional selectivity so it cannot differentiate between opposing diagonals. It also lacks shift invariance meaning that small geometrical changes in the input signal can cause large shifts in the wavelet coefficients. To overcome these shortcomings complex wavelets have been developed. This chapter describes two complex wavelet transform implementations and their properties. The benefit of these properties to watermarking is also detailed.
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Bouridane, A. (2009). Spread Transform Watermarking Using Complex Wavelets. In: Imaging for Forensics and Security. Signals and Communication Technology. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-09532-5_5
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