Abstract
This paper proposes an audio multi-watermarking scheme based on Gram–Schmidt orthogonalization. A random signal generator is applied to the host audio signal to generate the target segment for the local watermarking, thus improving the imperceptibility compared with the conventional global watermarking. The discrete cosine transform low-frequency coefficients of high stability are selected as watermark embedder, to ensure the robustness of this scheme. Consequently, the Gram–Schmidt orthogonalization process is employed to generate a set of orthogonal vectors, into which the spread transform dither modulation is applied to, respectively, embed the multiple watermark messages simultaneously. The orthogonality ensures that multiple watermark messages can be independently extracted without compromising the robustness against attacks. By embedding the multiple watermark messages into the same segment of the host audio signal, the watermark embedding capacity can be greatly enhanced while preserving the imperceptibility and robustness. A variety of experiments are conducted, and the results indicate the good performance of the proposed scheme. The proposed scheme has demonstrated superior performance gains over the state-of-the-art methods.
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Acknowledgements
This work was funded by the Science and Technology Development Fund, Macau SAR (File No. 051/2016/A2), and the National Natural Science Foundation of China (Grant No. 61902448).
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Yuan, X., Li, M. Gram–Schmidt Orthogonalization-Based Audio Multiple Watermarking Scheme. Circuits Syst Signal Process 39, 3958–3977 (2020). https://doi.org/10.1007/s00034-020-01347-4
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DOI: https://doi.org/10.1007/s00034-020-01347-4