Geometric-attack-resistible medical-image multiple-watermark method based on DFT (Discrete Fourier Transform)

Abstract

The invention relates to a geometric-attack-resistible medical-image multiple-watermark method based on DFT (Discrete Fourier Transform). The method comprises the following steps of: firstly carrying out embedding of multiple watermarks, wherein the step comprises (1) carrying out DFT on the original medical image, and extracting a vector of an important visual feature of the image in conversion coefficients; (2) utilizing the feature vector and the multiple watermarks to be embedded to obtain a corresponding two-valued logic sequence by virtue of a Hash function, storing the two-valued sequence in a third party, and then carrying out extraction of multiple watermarks; (3) carrying out whole-image DFT on the medical image to be detected, and finding a visual feature vector of the image to be detected; and (4) utilizing the property of the Hash function and the two-valued logic sequence stored in the third party to extract the watermarks. In the geometric-attack-resistible medical-image robust multiple-watermark method, the visual feature vector of the medical image, an encryption technology and the third-party conception are organically combined, the embedding problem of the multiple watermarks is solved, and stronger geometric attack resistance and conventional attack resistance can be achieved so as to protect the copyright of the medical image and the secrecy of information of patients.

Description

technical field [0001] The invention belongs to the field of multimedia signal processing, and relates to a medical image multiple digital watermarking technology based on DFT transformation and image visual features, in particular to a medical image multiple watermarking method based on DFT that can resist geometric attacks. Background technique [0002] In recent years, with the rapid development of computer science and multimedia communication technology, telemedicine has become more and more popular. However, when medical images are transmitted on the Internet, the personal information of patients is easy to leak. Using the invisibility and robustness of digital watermarking can A better solution to this problem is to embed the patient's personal information as a digital watermark in the medical image. [0003] At present, the research in the field of medical image digital watermarking mainly focuses on the two aspects of space domain and transform domain (DFT, DFT and D...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a medical image multiple watermarking method based on DFT that can resist geometric attacks, which organically combines the visual feature vector of medical images, encryption technology and the concept of a third party, and does not need to select the region of interest. Ideal robustness and invisibility, effectively solve the problem of multiple watermark embedding, and at the same time solve the problem of resisting geometric attacks and resisting conventional attacks in medical image applications, so as to protect the copyright of medical images and the protection of patient information privacy

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