Medical image robust watermarking method based on Arnold scrambling transformation and DCT (discrete cosine transformation)

A medical image and watermarking technology, applied in image data processing, image data processing, instruments, etc., can solve problems such as leakage or tampering, and achieve strong anti-geometric attack capability, high practical value, and high precision.

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

[0006] In the field of medical image digital watermarking research, geometric attack is still a relatively difficult topic so far. As for the watermarking method that can effectively resist conventional attack and geometric attack at the same time, the research on these two attack types of watermarking methods has not been reported yet, and it is still blank.
In practical applications, medical digital watermarked images are often attacked by both
[0007] 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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  • Medical image robust watermarking method based on Arnold scrambling transformation and DCT (discrete cosine transformation)
  • Medical image robust watermarking method based on Arnold scrambling transformation and DCT (discrete cosine transformation)
  • Medical image robust watermarking method based on Arnold scrambling transformation and DCT (discrete cosine transformation)

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Embodiment Construction

[0105]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 DCT coefficient matrix is ​​FD(i,j), and its low-intermediate frequency coefficient is...

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Abstract

The invention discloses a medical image robust watermarking method based on Arnold scrambling transformation and DCT (discrete cosine transformation), belonging to the field of multimedia signal processing. The method comprises the following steps: firstly embedding a watermark, specifically including (1) carrying out Arnold transformation on the watermark to be embedded to implement the pretreatment, (2) carrying out overall image DCT transformation on a medical image, and extracting a vector of a feature in a transformation domain, (3) obtaining a binary logic sequence through a Hash function by using the feature vector and the pre-treated watermark; and then carrying out watermark extraction, specifically including (4) carrying out overall image DCT transformation on a medical image to be tested, and extracting a feature vector; (5) extracting the watermark by using the property of the Hash function and a binary logic sequence of a third party; and (6) obtaining the original watermark through inverse transformation of the Arnold scrambling transformation. The experiment shows that the method has a very good information hiding capability and is of great significance in protecting the information of a patient in telemedicine.

Description

technical field [0001] The invention belongs to the field of multimedia signal processing, and relates to a medical image digital watermark technology based on Arnold scrambling transform, discrete cosine transform (DCT) and image visual features, specifically a medical image robustness based on Arnold scrambling transform and DCT Watermark method. Background technique [0002] At present, medical images account for 70% to 80% of the medical information in the whole hospital. The digital information management system plays an increasingly important role in the modern medical system. However, with the popularization and application of the network, its information security problems 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 personal information is embedded in the medical image as a digital watermark, this problem can be better solved. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 李京兵杜文才隋淼涂蓉
Owner HAINAN UNIVERSITY
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