A Semi-Fragile Digital Watermarking Algorithm Based on Integer Wavelet Matrix Norm Quantization for Medical Images

With the development of computer technology, medical images´ integrity and authenticity are queried more and more widely. As a protection and authentication technology, digital watermarking technology has been used to medical image field. In this paper, a semi-fragile digital watermarking algorithm is proposed based on integer wavelet transform to estimate integrity and authenticity of medical images. Using matrix norm quantization, it embeds watermarks into medium-frequency and high-frequency detail sub-bands of medical images´ integer wavelet domain and it is a blind-testing watermarking algorithm. Attacking experiments show that the algorithm not only has both robustness and sensitivity, but also exactly locates distorted area, so it is an effective semi-fragile digital watermarking algorithm for medical image field.