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Robust watermarking method for medical image based on Arnold scrambling transformation and DFT (discrete Fourier transformation)

A medical image and scrambling technology, applied in image communication, television, electrical components, etc., can solve problems such as leakage or tampering, achieve strong anti-geometric attack capabilities, improve security and reliability, and solve the effects of quickness

Inactive Publication Date: 2013-02-13
HAINAN UNIVERSITY
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Problems solved by technology

[0005] In the field of medical digital watermarking research, so far, resisting geometric attacks and embedding watermarks 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, and it is still blank.
In practical applications, digital watermarking of medical images is often subject to both attacks
[0006] Not only that, 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 image based on Arnold scrambling transformation and DFT (discrete Fourier transformation)
  • Robust watermarking method for medical image based on Arnold scrambling transformation and DFT (discrete Fourier transformation)
  • Robust watermarking method for medical image based on Arnold scrambling transformation and DFT (discrete Fourier transformation)

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Embodiment Construction

[0100]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 use 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 Figure 4 (b), of course, it is The scrambled image can be restored to the original image after a corresponding number of iterations, as shown in Figure 4(c). We mark 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 DFT coefficient matrix is ​​FF(i, j), select the low-frequency coefficient Y(j), 1≤...

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Abstract

The invention discloses a robust watermarking technology for a medical image based on Arnold scrambling transformation and DFT (discrete Fourier transformation), belonging to the field of processing of multimedia signals. The robust watermarking method comprises embedding of a watermark firstly, including the following steps: (1) carrying out Arnold scrambling transformation on pre-process the watermark to be embedded; (2) carrying out the total-graph DFT on the medical image, and extracting a characteristic vector in a transformation domain; (3) acquiring a binary logic sequence from the characteristic vector and the pre-processed watermark through a Hash function; and then extracting the watermark, including the following steps: (4) carrying out the total-graph DFT on the medical image to be measured, and extracting a characteristic vector; (5) with the Hash function properties and the binary logic sequence in which a third party exists, extracting the watermark; and (6) carrying out the inverse transformation of the Arnold scrambling transformation so as to acquire the original watermark. It is proved by experiment that the robust watermarking method for the medical image based on the Arnold scrambling transformation and the DFT has a very good information hiding function. The robust watermarking method for the medical image based on the Arnold scrambling transformation and the DFT can play an important role in protection of information of patients in telemedicine.

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 Fourier transform (DFT) and image visual features, specifically a medical image based on Arnold scrambling transform and DFT Robust Watermarking Methods. Background technique [0002] In recent years, with the rapid development of computer science and multimedia communication technology, telemedicine has become more and more popular. However, when medical images are transmitted on the Internet, the personal information of patients is easy to leak. Using the invisibility and robustness of digital watermarking can A better solution to this problem is to embed the patient's personal information as a digital watermark in the medical image. [0003] At present, the research in the field of medical image digital watermarking mainly focuses on the two aspects of space domain and tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N1/32H04N19/467
Inventor 李京兵杜文才隋淼涂蓉
Owner HAINAN UNIVERSITY
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