Volume data watermarking method based on three-dimensional DWT-DCT perception Hash and chaos

A DWT-DCT, perceptual hashing technology, applied in image data processing, image data processing, instruments, etc., can solve the problem of increasing the difficulty of embedding multiple watermarks, and achieve strong resistance to conventional attacks, high practical value, and a wide range of applications. Effect

Inactive Publication Date: 2014-07-23
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 watermarking method based on three-dimensional DWT-DCT perception Hash and chaos
  • Volume data watermarking method based on three-dimensional DWT-DCT perception Hash and chaos
  • Volume data watermarking method based on three-dimensional DWT-DCT perception Hash and chaos

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[0127] The present invention will be further described below in conjunction with the accompanying drawings, and a meaningful binary image is selected as the original multi-watermark, which is denoted as W={w(i,j)|w(i,j)=0,1; 1≤i ≤M1,1≤j≤N1}, see Figure 28 , where the size of the watermark is 32×32. Watermark after chaotic scrambling through Logistic Map, see Figure 29 , it can be clearly seen that the watermark has changed a lot, and the security has improved. The simulation platform is Matlab2010a, a slice of the original medical volume data is shown in Figure 5 , is taken from the magnetic resonance 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 multip...

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Abstract

The invention discloses a volume data watermarking technology based on three-dimensional DWT-DCT perception Hash and chaos, and belongs to the field of multi-media signal processing. The volume data watermarking technology comprises the steps that firstly, a chaos sequence is generated through Logistic Map, and watermarks are scrambled through the chaos sequence; secondly, the watermarks are embedded, global 3D DWT-DCT is conducted on medical volume data, the first 4*4*2 coefficients are selected, then 3D-IDCT is conducted, a perception Hash value with a robust feature is extracted from inverse transformation coefficients through the perception Hash, a binary secret key sequence is obtained through the relevance between a watermark sequence and the perception Hash value, and the binary secret key sequence is stored at a third party; thirdly, extraction of a perception Hash value of the three-dimensional DWT-DCT volume data is conducted on the volume data to be tested, the extracted perception Hash value is related to the binary secret key sequence stored at the third party to carry out watermark extraction, and the watermarks are restored through the chaos sequence.

Description

technical field [0001] The invention relates to a volume data digital watermarking technology based on three-dimensional DWT-DCT perception hash and chaos, 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 medica...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 李京兵黄梦醒周又玲陈晓枫王英杰
Owner HAINAN UNIVERSITY
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