Multiple Watermarking Using Multilevel Quantization Index Modulation

摘要

In this paper, a type of multilevel Quantization Index Modulation (QIM) algorithms is proposed by adopting the concept of multilevel nested lattice coding. We first introduce the multilevel scalar-QIM and then extend it to the vector case by using lattice-QIM. The lattice definition and nested lattices construction are specified such that the constructed nested lattices is suitable for multilevel lattice-QIM. The proposed scheme embeds multiple watermark sequences into the same host signal via several embedding rounds. Each round of embedding uses quantizers of different radii, and thus provides different robustness. As a result, the embedded watermark sequences can be used for various purposes. Benefiting from the scalable robustness and adjustable embedding rate, the proposed multilevel QIM presents good performances and supports a wide range of applications.