A blind robust digital watermarking using invariant exponent moments

It is a challenging work to design a robust audio watermarking scheme against various attacks. Moments and moment invariants have become a powerful tool in robust audio watermarking owing to their description capability and invariance property. Exponent moments (EMs) is a new kind of orthogonal moment defined on the circular domain. EMs has a better reconstruction, lower noise sensitivity, lower computational complexity, and excellent invariant property. Based on invariant exponent moments and synchronization code technique, a new and robust audio watermarking method with good auditory quality and reasonable resistance against most attacks is proposed in this paper. Specifically, the watermark data is efficiently inserted in host audio by taking advantage of both invariant EMs and quantization index modulation (QIM). EMs magnitude is robust to common signal processing operations, and QIM can render watermarking scheme blind in nature. To resist against desynchronization attack, the synchronization code technique is also integrated into our invariant EMs based audio watermarking method. Compared with the typical and related audio watermarking schemes, the proposed method is more robust to most attacks and has higher imperceptibility. The effectiveness of our method is demonstrated by simulation results.