Method for encrypting medical image robust watermark based on DCT (Discrete Cosine Transform) ciphertext domain
A medical image and robust watermarking technology, applied in image data processing, image data processing, instruments, etc., can solve and resist conventional attacks, resist geometric attacks and other problems, and achieve strong anti-conventional attack capabilities and strong anti-geometric attack capabilities , high precision effect
Inactive Publication Date: 2015-08-26
HAINAN UNIVERSITY
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[0007] The purpose of the present invention is to provide a chaotic encrypted medical image digital watermarking method based on DCT anti-geometric attack. By organically combining the visual feature vector of medical images, encryption technology and the concept of a third party, it is not necessary to select the region of interest , so as to solve the problems of cloud security and watermark embedding and extraction speed, with ideal robustness and invisibility, to protect the copyright of medical images and the confidentiality of patient information, and effectively solve the concealment of patient information and the sensitivity of medical images, and at the same time solve the problems of combating geometric attacks and conventional attacks in medical image applications
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[0096]The present invention will be further described below in conjunction with the accompanying drawings. First, a group of binary pseudo-random sequences that can represent patient information are used as the watermark to be embedded in the medical image, which is denoted as W={w(j)|w(j)=0,1 ;1≤j≤L}. See the original medical image after chaotic scrambling through Logistic Map Figure 20 , it can be clearly seen that the medical image has undergone great changes, and the security has been improved. It is recorded as: F={f(i,j)|f(i,j)∈R; 1≤i≤N1, 1≤j≤N2}. The corresponding full-image DCT coefficient matrix is CD(i,j), and its low-intermediate frequency coefficient is Y(j), 1≤j≤L. The first value Y(1) represents the DC component of the image, and then from low to Arranged in order of highest frequency. Considering the robustness and the capacity of embedding watermark at one time, we choose 4x8=32 coefficients of medium and low frequency as the feature vector, that is, L=32...
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The invention relates to a technology for encrypting a medical image watermark based on DCT (Discrete Cosine Transform) and Logistic Map, and belongs to the field of multimedia signal processing. In the steps of the technology, preprocessing of an original medical image and embedding of the watermark are performed firstly. The technology comprises the following steps: (1) acquiring an encrypted image with the DCT and the Logistic Map; (2) performing DCT on the encrypted image, and extracting a feature vector; (3) acquiring a binary logical sequence with the feature vector and a watermark sequence; and performing extraction of the watermark, including: (4) performing DCT on an encrypted medical image to be tested, and extracting one feature vector; (5) extracting the watermark with a Hash function and the binary logical sequence generated during embedding of the watermark; and (6) generating a binary encryption matrix with the Logistic Map to obtain a reduced decrypted medical image. In remote medical treatment, the technology has a high practical value for the protection of personal information of patients.
Description
technical field [0001] The invention belongs to the field of multimedia signal processing, and relates to a medical image digital watermarking technology based on DCT transformation, chaos (Logistic Map) and image visual features, in particular a method for robust watermarking of medical images encrypted by chaos based on DCT ciphertext domain. Background technique [0002] At present, medical images account for 70% to 80% of the medical information of the entire hospital. Digital information management systems have played an increasingly important role in the modern medical system. With rapid development, its information security issues are gradually exposed. [0003] When medical images are transmitted remotely on the network, the personal information of patients recorded on the medical images is easily leaked. If the entire medical image is chaotically encrypted, and then personal information is embedded in the medical image as a digital watermark, using the characterist...
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IPC IPC(8): G06T1/00
Inventor 李京兵陈延伟傅蔚斌涂蓉
Owner HAINAN UNIVERSITY
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