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Medical image fragile watermark method based on wavelet transform

A wavelet transform, medical image technology, applied in image communication, image coding, image data processing and other directions, can solve the problems of low signal-to-noise ratio of embedded watermarked images, can not meet the requirements of medical images, etc., to achieve guaranteed sensitivity, high signal-to-noise the effect of

Inactive Publication Date: 2007-09-26
SOUTHERN MEDICAL UNIVERSITY
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AI Technical Summary

Problems solved by technology

However, this algorithm makes the signal-to-noise ratio of embedded watermark images relatively low, which cannot meet the requirements of medical images.

Method used

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  • Medical image fragile watermark method based on wavelet transform
  • Medical image fragile watermark method based on wavelet transform
  • Medical image fragile watermark method based on wavelet transform

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Experimental program
Comparison scheme
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Embodiment Construction

[0041] watermark embedding

[0042] As shown in Figure 3, the embedding of the watermark includes:

[0043] The first step is wavelet forward transform: perform two-dimensional wavelet forward transform on the original image to be embedded with watermark to obtain wavelet coefficient image.

[0044] The second step is key generation: the key K is a randomly generated sequence of positive integers.

[0045] The third step is to find the node process:

[0046] For the convenience of explanation, some commonly used symbols are explained, as shown in Figure 5.1 and Figure 5.2:

[0047] x (i，j) : Low-frequency (LL frequency band) wavelet coefficients, i, j are their coordinates, and they are tree roots in the wavelet tree;

[0048] x r1 (i，j) , r1∈(0, 1, 2): with x (i，j) is the wavelet coefficient of the parent node. When r1 takes 0, 1, 2 respectively, x r1 (i，j) are the coefficients in the HL, LH, and HH bands, respectively.

[0049] x r1，r2...

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Abstract

This invention discloses a method for small wave transformed medicine brittle image watermark method including two parts of watermark insertion and extraction, the first part includes small wave positive transformation, a cryptographic key generation process, a process of searching for nodes, a small wave inverse transformation, the second part extracts the watermark from the image having inserted with water mark including a small wave positive transformation, searching for the nodes and watermark recovery.

Description

technical field [0001] The invention relates to a wavelet transform-based medical image fragile watermark method for information hiding, protection and authentication. Background technique [0002] With the advancement of digital construction in hospitals, traditional medical image storage and imaging media have changed from film to digital image CDs and disks. This undoubtedly brings a lot of convenience to clinical diagnosis. But since digital images are easily modified, the authentication of distributed images is particularly important. Digital watermarking is a commonly used image authentication technology, which can be used for authentication of medical images. Watermarking technology is divided into fragile watermarking and robust watermarking. Fragile watermarking is an important branch of digital watermarking technology. Fragile watermarking emphasizes the authentication function of data integrity and validity and the location analysis ability of data destruction ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/08G06T9/40H04N1/387
Inventor 陈凌剑冯前进陈武凡
Owner SOUTHERN MEDICAL UNIVERSITY
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