A zero-watermark embedding method for medical images based on nsct combined transformation

A medical image, zero watermark technology, applied in the computer field, can solve problems such as poor robustness, and achieve the effect of enhancing security, ensuring integrity, and ensuring quality

Active Publication Date: 2021-06-25
HAINAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of this application is to provide a medical image zero-watermark embedding method, device, equipment and readable storage medium based on NSCT combined transformation, to solve the problem that the traditional watermark embedding scheme cannot avoid the leakage of medical image information and watermark information, and the The problem of poor stickiness

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  • A zero-watermark embedding method for medical images based on nsct combined transformation
  • A zero-watermark embedding method for medical images based on nsct combined transformation
  • A zero-watermark embedding method for medical images based on nsct combined transformation

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Embodiment 1

[0053] The following introduces Embodiment 1 of a medical image zero-watermark embedding method based on NSCT combined transformation provided by this application, see figure 1 , embodiment one includes:

[0054] S101. Acquire the original medical image and the binary watermark image generated according to the patient information;

[0055] S102. Perform NSCT transformation, RDWT transformation, and DCT transformation on the pixel gray value matrix of the original medical image to obtain a coefficient matrix; extract binary symbols of a preset number of low-frequency coefficients in the coefficient matrix as the obtained Describe the feature vector matrix of the original medical image;

[0056] S103. Perform Arnold transformation on the pixel gray value matrix of the binary watermark image to obtain an encrypted watermark information matrix;

[0057] S104. Execute an XOR operation on the eigenvector matrix and the encrypted watermark information matrix to obtain a logical key...

Embodiment 2

[0074] The following is a detailed introduction to Embodiment 2 of a medical image zero-watermark embedding method based on NSCT combined transformation provided by this application, see Figure 5 , embodiment two specifically includes:

[0075] S501. Acquire the original medical image and the binary watermark image generated according to the patient information;

[0076] Specifically, a meaningful binary text image is selected as the binary watermark image embedded in the medical image, denoted as W n ={w(i,j)|w(i,j)=0,1;}. At the same time, select the tenth piece of medical volume data as the original medical image, denoted as I(i,j), where W n (i,j) and I(i,j) denote the pixel gray value of the binary watermarked image and the original medical image, respectively.

[0077] S502. Perform NSCT transformation, RDWT transformation, and DCT transformation on the pixel gray value matrix of the original medical image respectively to obtain a coefficient matrix; extract binary s...

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Abstract

This application discloses a medical image zero watermark embedding method, device, equipment and readable storage medium based on NSCT combined transformation. The solution is realized based on NSCT, RDWT, DCT mixed transformation and Arnold transformation. , combining NSCT, RDWT, and DCT to extract more robust medical image feature vectors to resist geometric attacks. Secondly, Arnold transform is used to encrypt the watermark to enhance the security of the watermark information. Finally, the zero watermark technology is used to realize watermark embedding, which ensures the integrity, watermark capacity and invisibility of medical images, avoids the defects caused by traditional watermark embedding technology to modify the original image data, and ensures the quality of medical images. Therefore, even if the patient's information is attacked intentionally or unintentionally, as long as the unauthorized user does not know the key, the medical image and watermark cannot be deciphered, so that the patient's personal information is truly protected.

Description

technical field [0001] The present application relates to the field of computer technology, in particular to a zero-watermark embedding method, device, equipment and readable storage medium for medical images based on NSCT combined transformation. Background technique [0002] In the field of biomedicine, a large number of digital data are generated every day, including ultrasound, X-ray pictures, CT and MRI, etc. Most of these materials use the PACS system for image storage and remote communication, but transmission and storage in the cloud environment are easy to be stolen or tampered with, making researchers conduct in-depth research on the confidentiality, integrity and authenticity of medical images. Research. At the same time, medical images contain a large amount of important information of patients, and they face security threats when they are stored and transmitted on the Internet. Therefore, it is urgent to take protective measures for medical images of patients....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00G16H30/40G16H10/60
CPCG06T1/005G06T2201/0052G06T2201/0065G16H10/60G16H30/40
Inventor 李京兵周经俊黄梦醒涂蓉
Owner HAINAN UNIV
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