A Fragile Watermark Method for Improving Medical Images Security

Abstract

Aiming at the medical images security problem during storage and transmission, the author provides a fragile watermark method to protect it. And this method can be able to achieve integrity detection and accurate tampering localization. This method adopts image block, chaotic modulation in watermark information and encryption to set password. The watermark information will be embedded to the least significant bits of original medical image's sub-block area. Experimental results show that the algorithm has the following features: (1) The watermarked medical images has high and stable quality. (2) It is sensitive to manipulations, and any manipulation of any pixel can be detected. (3) The tampering localization can be accurate into 2×2 pixel area. (4) The algorithm achieves the blind detection with high security.