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.