Digital Watermarking using Complex Wavelets
Patrick Loo
Broschiertes Buch

Digital Watermarking using Complex Wavelets

A review of digital watermarking and the use of wavelets in improving the fidelity of watermarked images.

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Digital watermarks emerged in the last decade as a possible solution for protecting the copyright of digital materials. We introduce complex wavelets as a novel transform for watermarking images. The complex wavelets transform has similar properties to the human visual system and experimental results show that watermarking systems designed using complex wavelets have good performance. Two different watermarking systems are considered here. The first one is based on the principles of spread spectrum communications. An alternative matched filter is proposed for watermark decoding, which is shown...