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Three-dimension wavelet transform-based method for embedding multiple watermarks in volume data

A technology of wavelet transform and volume data, which is applied in image data processing, image data processing, instruments, etc., can solve problems such as difficulty in implementation, and achieve the effects of wide application range, strong resistance to conventional attacks, and good compatibility

Inactive Publication Date: 2011-07-27
HAINAN UNIVERSITY
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Problems solved by technology

[0004] At present, in the field of digital watermarking research, there are few studies on how to embed watermarks in volume data, because medical images (CT, MRI, etc.) are mostly volume data, and these volume data are not allowed to modify their content in principle. In addition, the next-generation image compression standard JPEG2000 is based on wavelet transform, so it is of great significance to embed multiple watermarks in volume data based on 3D DWT and DCT, and requires the embedded multiple watermarks to have strong robustness , its implementation is quite difficult, and has not been reported so far, and it is still blank

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  • Three-dimension wavelet transform-based method for embedding multiple watermarks in volume data

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Embodiment Construction

[0098] Below in conjunction with accompanying drawing, the present invention will be further described

[0099]Using 1000 sets of independent binary pseudo-random sequences (with values ​​of +1 or -1) each set of sequence length is 64bit, in these 1000 sets of data, we randomly sampled three sets (that is, in this experiment, the individuals with multiple watermarks The number n is 3), specifically, the random sequences of the 300th group, the 500th group and the 800th group are taken as the three embedded watermark sequences. A slice of the volume data is shown in Figure 6(a), the corresponding 3D imaging of the volume data is shown in Figure 6(b), and the output of the watermark detector is shown in Figure 6(c) without interference. The volume data used in the experiment is MRI.mat provided in matlab, the volume data size is 128x128x27), the original image is expressed as F(i, j, k), where 1≤i, j≤128; 1≤k≤27, The coefficient matrix of the corresponding three-dimensional DWT...

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Abstract

The invention discloses a three-dimension wavelet transform-based method for embedding multiple watermarks in volume data, belonging to the field of multimedia signal processing. The method comprises watermark embedding and multi-watermark extraction, wherein the watermark embedding comprises the following steps: (1) performing three-dimension wavelet transform and global cosine transform on original data, extracting a geometric attack resistance characteristic vector from a transformation coefficient; and (2) obtaining a corresponding binary logic sequence through Hash function by utilizing the characteristic vector and multiple watermarks to be embedded, and storing the binary sequence in a third party; and the multi-watermark extraction comprises the following steps: (3) performing three-dimensional wavelet transform and global cosine transform on the 'volume data to be detected', and extracting the characteristic vector of the object in a transform domain; and (4) extracting the multiple watermarks by utilizing the characteristic of the Hash function and the binary logic sequence saved in the third party. experiments prove that the three-dimension wavelet transform-based technology for volume data embedding multiple watermarks in volume data has strong resistance against geometric and normal attacks.

Description

technical field [0001] The invention relates to a technique of embedding multiple digital watermarks in volume data based on three-dimensional wavelet transform (DWT) and three-dimensional cosine transform (DCT), which is a multimedia data protection method and belongs to the field of multimedia signal processing. technical background [0002] With the rapid development of digital technology and Internet technology, various digital media such as text, image, sound, video, etc. can be transmitted quickly and conveniently through the Internet. It also makes the tampering and piracy of these information very easy. [0003] Digital watermarking is an effective means to realize the copyright protection of digital works. Therefore, this technology has become a research hotspot in the field of multimedia information security. But most research directions are in image and audio digital watermarking. [0004] At present, in the field of digital watermarking research, there are few...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 李京兵杜文才
Owner HAINAN UNIVERSITY
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