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Volume data multi-watermark method based on three-dimensional DWT-DCT (3D Wavelet Transform-Discrete Cosine Transformation) perceptual hashing

A DWT-DCT, volume data technology, applied in image data processing, image data processing, instruments, etc., can solve the problem of embedding multiple watermarks to increase the difficulty, achieve strong resistance to conventional attacks, wide application range, and strong resistance to geometric attacks effect of ability

Inactive Publication Date: 2014-06-11
HAINAN UNIVERSITY
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Problems solved by technology

This increases the difficulty of embedding multiple watermarks in volume data

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  • Volume data multi-watermark method based on three-dimensional DWT-DCT (3D Wavelet Transform-Discrete Cosine Transformation) perceptual hashing
  • Volume data multi-watermark method based on three-dimensional DWT-DCT (3D Wavelet Transform-Discrete Cosine Transformation) perceptual hashing
  • Volume data multi-watermark method based on three-dimensional DWT-DCT (3D Wavelet Transform-Discrete Cosine Transformation) perceptual hashing

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[0122] The simulation platform is Matlab2010a, using 1000 sets of independent binary pseudo-random sequences (value +1 or -1), each set of sequence length is 64bit, in these 1000 sets of data, we randomly select three sets (here we choose the 300th set , 500 and 700 groups) as the embedded three watermark sequences. Below in conjunction with accompanying drawing, the present invention will be further described, and a slice of original medical volume data sees Figure 5 , is taken from the NMR three-dimensional image volume data (MRI.mat) that comes with matlab. The size of the volume data is 128x128x27. See Figure 9 . The original volume data is expressed as F(i,j,k), where 1≤i,j≤128; 1≤k≤27, and the corresponding three-dimensional DWT-DCT coefficient matrix is ​​FD(i,j,k), where 1≤ i,j≤128; 1≤k≤27. Considering the robustness and capacity of embedding multiple watermarks at once, we take the first 4×4×4 coefficients. Then perform 3D-IDCT transformation, and calculate the ...

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Abstract

The invention discloses a volume data multi-watermark method based on three-dimensional DWT-DCT (3D Wavelet Transform-Discrete Cosine Transformation) perceptual hashing, and belongs to the field of multimedia signal processing. The method comprises the following steps: firstly, performing 3DDWT-DCT on medial volume data, selecting previous 4*4*4 coefficients, further performing 3D-IDCT (Three Dimensional-Inverse Discrete Cosine Transformation), subsequently extracting a perceptual hashing value with a robust characteristic in an inverse transformation coefficient through perceptual hashing, associating a multi-watermark sequence with the perceptual hashing value to obtain a string of two-value key sequences, subsequently storing the two-value key sequences in a third party, extracting the three-dimensional DWT-DCT perceptual hashing value from volume data to be tested, and associating the extracted perceptual hashing value with the two-value key sequences stored in the third party so as to extract multiple watermarks. The method is a volume data multi-digital watermarking technique based on three-dimensional DWT-DCT perceptual hashing, and has good robust property, and the content of original volume data is not changed by embedding of multiple watermarks.

Description

technical field [0001] The invention relates to a three-dimensional DWT-DCT perceptual hash-based multi-digit watermarking technology for volume data, is a multimedia data protection method, and belongs to the field of multimedia signal processing. technical background [0002] Remote medical diagnosis can be realized by using the Internet. When medical body data is transmitted remotely on the network, the personal information of the patient recorded on the medical picture is easily leaked. With the popularization of the Internet, how to protect the personal privacy of patients and prevent personal information on medical images such as CT and MRI of patients from being leaked, and data such as electronic medical records of patients, has become increasingly serious with the popularization of the Internet. Today's encryption methods and access control are difficult to meet the requirements of medical data information security. If personal information is embedded in medical ima...

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Application Information

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IPC IPC(8): G06T1/00G06F21/10
Inventor 李京兵魏应彬段玉聪龙翔涂蓉
Owner HAINAN UNIVERSITY
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