Informed embedding with selective host rejection for CDMA-based high-payload and robust watermarking

This paper presents an informed embedding method for code division multiple access (CDMA) based robust watermarking. First, a generalized model for CDMA-based watermarking with informed embedding is described, taking into account more detailed host information and possible pre-processing operations on the watermark at both the embedder and the extractor. Then, as special cases of this model, several typical embedding methods are analyzed, including an informed embedding method with selective host rejection which exhibits better robustness for high-payload watermarking. Moreover, an audio watermarking scheme is designed to verify the proposed method. Experimental results show that this scheme can achieve a high payload of up to more than 200 bps (bit per second) while preserving the audio fidelity and the robustness against common signal processing and attacks. Therefore, the proposed model and embedding method provide a general and effective approach to improve the performance of CDMA-based watermarking systems.