Robust zero-watermarking algorithm for medical images based on Hadamard-DWT-DCT
Mingshuai Sheng, Jingbing Li, Jing Liu · International Journal of Wireless and Mobile Computing · 2022
As the IT industry grows rapidly, information security is particularly important. Digital development is a double-edged sword for the medical field, which not only brings convenience to patients and doctors, but also has hidden dangers for information security. We propose a Hadamard-DWT-DCT-based zero watermark algorithm for medical images for the problem of privacy information leakage when medical images are transmitted on the internet. First, the raw medical image is chunked using the Hadamard transformation and produces a coefficient matrix, which is then transformed into a wavelet coefficient matrix, which can be efficiently compressed and stored. The wavelet coefficient matrix is then DCT-transformed to finally obtain the eigenvector. Experimental results show that the proposed algorithm is not only highly robust, and the watermark can still be effectively extracted against different degrees of geometric and conventional attack interference, but also can encrypt the patient privacy information contained in the medical image.