A watermarking based authentication and image restoration in two-layer multimedia sensor networks

In this paper, we proposed a novel watermarking based secure image acquisition scheme for two-layer visual sensor networks, which provides support for image authentication and restoration. In this scheme, the sensor node groups image frames, and two successive frames compose the non-overlapping authentication and restoration group. The watermarking bits which are the version of the down sampling image are computed from the first image and reversibly embedded into the second one before storage. The sink does the verification and restoration by reversible watermark. Compared with the previous work, our approach can not only implement authentication but also improve image quality. Analysis and experimental results show that our scheme can achieve gains in terms of authentication performance and efficient packet loss tolerance to improve the image quality.