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This paper proposes a technique based on CDMA and multilevel coding in order to achieve a high capacity watermarking scheme. The bits of watermark are grouped together and for each sequence a different modulation coefficient is used. Using the wavelet transform domain for embedding watermarks offers many advantages including robustness against intentional and unintentional attacks. The proposed algorithm results in low computational demands while maintains the same high accuracy achieved by other approaches.
Index Terms: Watermarking, Digital copyright, M-ary modulation, Embedding capacity.
Luigi Rosa, “High Capacity Wavelet Watermarking Using CDMA Multilevel Codes”, June 2009.