Watermarking method for medical images on basis of DFT (discrete Fourier transform) and LogisticMap

Abstract

The invention relates to a robust watermarking method on the basis of DFT (discrete Fourier transform) and a Logistic Map, and belongs to the field of multimedia signal processing. The robust watermarking method includes preprocessing and embedding watermarks and then extracting and reducing the watermarks, and particularly includes steps of (1), generating a binary encrypted matrix by the aid of the Logistic Map; (2), obtaining encrypted watermarks; (3), performing DFT for an original image and extracting feature vectors; (4), generating a binary logic sequence by the aid of the feature vectors and the chaotically encrypted watermarks to complete the process for preprocessing and embedding the watermarks; (5), performing DFT for an image to be measured to extract vectors of a feature; (6), extracting watermarks by the aid of a Hash function and the binary logic sequence generated when the watermarks are embedded; (7), generating a binary encrypted matrix by the Logistic Map; and (8), solving the reduced watermarks so as to complete the process for extracting and reducing the watermarks. The robust watermarking technology has a high practical value in the aspect of protecting personal information of patients during remote medical treatment.

Description

technical field [0001] The invention is a multimedia signal processing field, involving a medical image digital watermark technology based on DFT, Logistic Map, and image visual characteristics. It is specifically a medical image watermark method based on DFT and Logistic Map. Background technique [0002] In recent years, with the rapid development of computer science and technology and multimedia communication technology, remote medical care has become increasingly popular, but when medical image transmission on the Internet, patients' personal information is easy to leak. To solve this problem better, that is, the patient's personal information is embedded in a digital watermark in a medical image. [0003] At present, the research on the field of digital watermarks in medical images is mainly concentrated in two aspects: space domain and transformation domain (DCT, DFT, and DWT). to embed the watermark. [0004] In view of the special requirements for the protection of...

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Problems solved by technology

[0005] In the field of medical image digital watermarking research, so far, the embedding of robust watermarks against geometric attacks based on DFT and Logistic Map is still a difficult problem to solve. As for the research on watermark embedding methods that can effectively resist conventional attacks and geometric attacks at the same time, There is no report yet, it is still blank

In practical applications, digital watermarking of medical images is often subject to both attacks

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