Image Security Through Watermarking

Telemedicine and healthcare infrastructure depends on Hospital Information Systems (HIS), Radiology Information Systems (RIS), Picture archiving and Communication Systems (PACS) as these provide new ways to store, access and distribute medical data. Equally, these developments have introduced new risks for unsuitable deployment of medical information flowing in open networks. Medical images need to be kept intact in any condition and prior to any operation as well need to be checked for integrity and verification. In recent times, frequency domain watermarking algorithms have gained immense importance due to their widespread use. The proposed watermarking scheme makes use of hybrid transform, which combines Discrete Cosine Transform (DCT) and Discrete Wavelet Transform (DWT). In the proposed watermarking scheme, various types of attacks are given and checked for authenticity. The software used is Matlab 7.9 version. The effectiveness of the proposed watermarking scheme is demonstrated with the aid of experimental results.