Medical image robust watermarking method based on SIFT-DCT

A medical image and watermarking technology, applied in medical image, image data processing, image data processing and other directions, to achieve the effect of protecting data security, strong robustness and invisibility

Inactive Publication Date: 2018-11-23
HAINAN UNIVERSITY
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Problems solved by technology

[0005] In short, the method of embedding a digital watermark that is resistant to geometric attacks such as rotation, scaling, translation, shearing, and distortion in SIFT-DCT-based medical images is still blank and has not been publicly reported.

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  • Medical image robust watermarking method based on SIFT-DCT

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Embodiment Construction

[0089] The present invention will be further described below in conjunction with accompanying drawing, the object of experimental test is the abdominal medical image of 512 * 512, see figure 1 , represented by I(i,j), where 1≤i, j≤512. Select a meaningful binary image as the original watermark, recorded as: W={w(i,j)|w(i,j)=0,1; 1≤i≤M1,1≤j≤M2}, see figure 2 , where the size of the watermark is 32×32. First, the SIFT algorithm is used to process the original image. Among the three generated matrices, the descrips feature descriptor matrix is ​​selected for DCT transformation. Considering the robustness and the capacity of one-time embedding watermark, we take 32 coefficients, that is, a 4 *8 modules. Set the initial value of the chaos coefficient to 0.2, the growth parameter to 4, and the number of iterations to 32. Then perform chaotic encryption on the original watermark, and the encrypted watermark can be seen in image 3 . After detecting W'(i,j) through the watermark...

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Abstract

The invention discloses a medical image robust watermarking method based on SIFT-DCT, and belongs to the field of multimedia signal processing. The method comprises the steps of firstly, carrying outsymbol encryption on a watermark in a frequency domain by utilizing the properties of a Logistic Map; secondly, extracting an eigenvector by performing SIFT-DCT on a medical image to perform watermarkembedding, associating the eigenvector with a binary watermark to obtain a binary logic sequence, and storing the binary sequence in a third party; and thirdly, extracting an eigenvector by performing the SIFT-DCT on the to-be-tested medical image again, and associating the eigenvector with the binary sequence stored in the third party to carry out watermark extraction. The method is a medical image digital watermarking technology based on the SIFT-DCT, has relatively good robustness, and is especially outstanding for geometric attacks such as rotation, translation, shearing and the like; and watermark embedding does not change contents of original encrypted volume data, so that the method is a zero watermarking technology.

Description

technical field [0001] The present invention relates to a medical image robust digital watermarking technology based on SIFT-DCT transformation, chaotic mapping and image feature vectors, specifically a SIFT-DCT-based medical image robust watermarking method, which is a multimedia data protection method, It belongs to the field of multimedia signal processing. technical background [0002] The development of medicine is gradually changing from traditional medicine to telemedicine, which makes a large number of medical images transmitted and shared in the network; in order to solve the problems that medical images may be tampered with and stolen during the transmission and sharing process, it is necessary to process the original medical images; The combination of zero watermark technology and perceptual hash technology, as a security technology for information security, can not only ensure safe transmission, but also realize information authentication, which is very important...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00G16H30/20
CPCG06T1/0064G16H30/20
Inventor 李京兵刘嘉玲涂蓉陈晶
Owner HAINAN UNIVERSITY
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