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Robust watermarking method for medical images on basis of Arnold scrambling transformation and DWT (discrete wavelet transform)-DFT (discrete Fourier transform)

A DWT-DFT, medical image technology, applied in image data processing, image data processing, instruments, etc., can solve problems such as leakage or tampering, achieve strong anti-geometric attack capabilities, improve security and reliability, and have high practical value.

Inactive Publication Date: 2013-02-20
HAINAN UNIVERSITY
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Problems solved by technology

[0005] For the research on medical images, considering patient information and some special privacy, once the watermark is extracted, it may be exposed to the risk of leakage or tampering

Method used

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  • Robust watermarking method for medical images on basis of Arnold scrambling transformation and DWT (discrete wavelet transform)-DFT (discrete Fourier transform)
  • Robust watermarking method for medical images on basis of Arnold scrambling transformation and DWT (discrete wavelet transform)-DFT (discrete Fourier transform)
  • Robust watermarking method for medical images on basis of Arnold scrambling transformation and DWT (discrete wavelet transform)-DFT (discrete Fourier transform)

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Embodiment Construction

[0111] The present invention will be further described below in conjunction with accompanying drawing. Use a meaningful binary image as the watermark, see Figure 4(a), the size is 32×32. The original medical image used in the experiment is a three-dimensional image of the brain after CT scanning. The image of the tenth slice (128x128) is selected as shown in Figure 1(a). First utilize the scrambling transformation to scramble and encrypt the watermark (the number of times of scrambling depends on the desired effect, the number of times of scrambling is n=10, and the period of scrambling is T=24), see Fig. 4(b), of course, The scrambled image can be restored to the original image after a corresponding number of iterations, as shown in Figure 4(c). We denote the scrambled watermark as BW(i, j). Let the original image be expressed as F(i, j), where 1≤i≤128, 1≤j≤128, the corresponding full-image DWT-DFT coefficient matrix is ​​FF(i,j), and the low intermediate frequency coeffici...

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Abstract

The invention discloses a robust watermarking technology for medical images on the basis of Arnold scrambling transformation and DWT (discrete wavelet transform)-DFT (discrete Fourier transform), and belongs to the field of multimedia signal processing. The robust watermarking technology includes embedding watermarks and then extracting the watermarks, and particularly includes steps of (1), performing Arnold transformation for watermarks to be embedded; (2), performing DWT for a medical image, performing DFT for approximation sub-images of the medical image, and extracting vectors of a feature; (3), generating a binary logic sequence via a Hash function by the vectors of the feature and the preprocessed watermarks so as to complete the process for embedding the watermarks; (4), performing DWT for a medical image to be measured, performing DFT for approximation sub-images of the medical image to be measured and extracting vectors of a feature; (5), extracting watermarks by the aid of the Hash function and a binary logic sequence stored in a third party; and (6), obtaining the original watermarks via Arnold inverse transformation so as to complete the process for extracting the watermarks. The robot watermarking technology has an important significance in protecting information of patients during remote medical treatment.

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 Arnold scrambling transform, discrete wavelet transform (DWT), discrete Fourier transform (DFT) and image visual features, specifically a technology based on Arnold scrambling Random transform and DWT-DFT method for robust watermarking of medical images. Background technique [0002] With the continuous progress and development of multimedia technology and digital image processing, digital imaging technology has widely penetrated into the medical field, and the use of computerized tomography (CT) and magnetic resonance imaging (MRI) for diagnosis has become a modern medical An indispensable and effective aid in diagnosis. At present, medical images account for 70%-80% of the medical information in the entire hospital. Digital information management systems play an increasingly important role in the modern medical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 李京兵杜文才白勇任佳
Owner HAINAN UNIVERSITY
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