A Robust Watermarking Algorithm of Encrypted Medical Volume Data Based on 3D DWT and 3D DCT

Abstract

Abstract. This work proposed a novel scheme for robust watermarking in the encrypted medical volume data, which protects the original medical volume data from the third party embedders. The original medical volume data is encrypted using a selective partial encryption method based on 3D DCT and Logistic Map. In the watermark embedding phase, the watermark is associated with the feature vector of the encrypted medical volume data, generating a key which will be used in watermark extraction. The feature vector of the encrypted medical volume data is extracted in a way combining 3D DWT and 3D DCT. The watermark extraction is performed on the encrypted domain. The proposed watermarking algorithm realizes zero-watermarking technology in the encrypted domain, which has no effects on the encrypted medical volume data. The experimental results show that the proposed watermarking scheme has good robustness to some normal and geometric attacks. Therefore, it has a good practical value.