MRI watermarking in compressive sensing context

The paper proposes procedure for the watermarking of the magnetic resonance images (MRI) using Compressive Sensing approach. The watermark is created as a pseudo random sequence, which is embedded into the set of 2D discrete Fourier transform (2D DFT) coefficients of the observed image. The watermarking coefficients are selected along the radial lines in 2D DFT domain. In order to provide successful watermark detection, regardless the radial lineation, the watermark spreading is proposed. The experimental results prove that the proposed embedding procedure provides successful protection of MRI images even in the case when very small number of CS measurements is used for reconstruction. The efficiency of watermark detection is tested after the repeated Compressive Sensing procedure, as well as under the strong noise disturbances.