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Volume data watermark realizing method based on three-dimension DCT and chaotic scrambling

A technology of chaotic scrambling and implementation method, applied in the field of multimedia data protection and digital watermarking, to achieve strong resistance to geometric attacks, strong resistance to conventional attacks, and high practical value

Inactive Publication Date: 2013-09-04
HAINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In short, the algorithm for embedding a digital watermark in 3D volume data that can resist geometric attacks such as rotation, scaling, translation, shearing, and distortion is still blank and has not been publicly reported.

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  • Volume data watermark realizing method based on three-dimension DCT and chaotic scrambling
  • Volume data watermark realizing method based on three-dimension DCT and chaotic scrambling
  • Volume data watermark realizing method based on three-dimension DCT and chaotic scrambling

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Embodiment Construction

[0124] The present invention will be further explained below in conjunction with the accompanying drawings. A meaningful binary image is selected as the original watermark, which is marked as: W={w(i,j)|w(i,j)=0,1;1≤i≤ M1,1≤j≤M2), see Figure 25 , The size of the watermark here is 32×32. See the watermark after chaos scrambling through Logistic Map Figure 26 , You can clearly see that the watermark has changed a lot, and the security is improved. A slice of the original medical volume data see figure 1 , Is taken from the MRI three-dimensional image volume data (MRI.mat) that comes with matlab, the size of the volume data is 128x128x27, see Figure 5 . The original volume data is expressed as F(i,j,k), where 1≤i,j≤128; 1≤k≤27, and the corresponding 3D-DCT coefficient matrix is ​​FD(i,j,k), where 1≤i ,j≤128; 1≤k≤27. Considering the robustness and the capacity of one-time embedding of the watermark, we take 32 coefficients. After detecting W’(i,j) through the watermarking alg...

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Abstract

The invention discloses a volume data watermark realizing method based on three-dimension DCT and chaotic scrambling and belongs to the multimedia signal processing field. The method comprises the following steps: first, utilizing the nature of a logistic map to conduct chaotic scrambling on a watermark; then, extracting an eigenvector through conducting 3D-DCT conversion on original volume data to embed the watermark, and associating the eigenvector and the chaotic scrambled watermark to obtain a two-valued logic sequence, storing the two-valued logic sequence in a third party; conducting 3D-DCT conversion on the volume data to be detected to extract the eigenvector of the volume data to be detected, and associating the eigenvector with the two-valued logic sequence stored in the third party to conduct extraction of the watermark; finally, utilizing the nature of the logistic map and the same initial value to conduct recovery of the watermark. The volume data watermark realizing method is a volume data digital watermark technology based on the three-dimension DCT and the chaotic scrambling, and has good robustness. Moreover, embedding of the watermark does not change the content of the original volume data.

Description

Technical field [0001] The invention relates to a digital watermarking technology based on three-dimensional DCT transform and chaotic image characteristics of volume data, which is a multimedia data protection method and belongs to the field of multimedia signal processing. technical background [0002] The use of the Internet can realize remote medical diagnosis, but when the patient’s medical images are transmitted via the Internet, the patient’s personal information may be leaked. How to protect the patient’s personal privacy, make the patient’s personal information on the CT, MRI and other medical images, Data such as medical records are not leaked. This problem has become increasingly serious with the popularity of the Internet. Medical Image Watermarking (MIW) technology can effectively solve this problem. [0003] Digital watermarking technology was originally used for the copyright protection of digital media on the Internet. Now using the invisibility and robustness of d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00G06F17/14
Inventor 李京兵陈延伟刘瑶利
Owner HAINAN UNIVERSITY