A noval fragile watermarking method for medical images using quadtree structure.

This paper presents a new fragile watermarking scheme based on integral wavelet transform. The proposed method uses the quadtrees structures received by the wavelet decomposition, statistical information on the nodes and secret key to choose the locations where to embed the watermark. Only one bit watermark information will be hidden in the found position. Any changes on the fragile watermarked image will break the way to find out the correct position where the watermark is embedded. The preliminary experimental results indicate that the proposed method conforms to the human perception characteristics and provides a perceptually invisible fragile watermark with fewer image data modified, compared with some other conventional fragile watermarking methods.