Reversible watermark method for image certification

An image authentication and watermarking technology, applied in image data processing, image data processing, instruments, etc., can solve the problems of poor visual quality of the image to be authenticated, complex system implementation, and large computational load, and achieve accurate tampering and positioning functions, good vision Effects, effects with large embedding capacity

Inactive Publication Date: 2006-12-27
SUN YAT SEN UNIV
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Problems solved by technology

The methods of the first and second types use lossless compression technology, so the amount of calculation is large, and the system implementation is more complicated. For pictures with complex textures, lossless compression technology cannot provide enough embedding capacity, so it is often difficult to be practical
However, the method of patent [2] in the third method leads to poor visual quality of the image to be certified, because the change of the edge pixel value is too large
For image authentication methods and technologies,...

Method used

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  • Reversible watermark method for image certification
  • Reversible watermark method for image certification
  • Reversible watermark method for image certification

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Embodiment Construction

[0041] The present invention can be applied to general images and sensitive pictures such as pictures of military pictures, medical pictures and news publications. Here we take the representative grayscale image lena.bmp with a size of 512×512 as an example, see Figure 5 As shown, where (a) is the original image Lena, (b) is the image to be authenticated with 4407 bits embedded, and the PSNR is 46.24dB. The implementation method of the present invention will be described below in conjunction with the accompanying drawings.

[0042] figure 1 Shown is the implementation principle block diagram of the data hiding of the present invention such as, wherein X' NxM Represents the image after histogram correction, C k，l 、LL K respectively represent the set of nine high-frequency subbands and low-frequency subbands after integer wavelet decomposition, C' k，l 、LL' K Represents the set of nine high-frequency subbands and the low-frequency subband after data is embedded, respective...

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Abstract

The invention relates to a reversible watermark method used in image identification, belonging to multimedia information safety technique, wherein the invention modifies high-frequency sub-band histogram to embed the SHA-256 Haxi value of original image and the data used to recover image into high-frequency sub-band; via replacing the most low bit plane of low-frequency sub-band to embed the useful watermark into low-frequency sub-band; based on extracted watermark or the differential value picture between extracted watermark and former watermark to process falsification check and positioning; comparing extracted Haxi value and the Haxi value of returned image to process content completeness check. The invention can resist false impact, check and position falsification, to return original image without aberration.

Description

technical field [0001] The invention belongs to the technical field of multimedia signal processing, and in particular relates to a reversible watermark method for image authentication, which has a large embedding capacity, can resist forgery attacks, and has the function of tampering and positioning. Background technique [0002] Digital images have been widely used, but they are easily tampered or even forged during transmission and storage. It has become a need for the information society to authenticate the authenticity and integrity of digital image content, especially in military, medical, and news Image authentication is essential for sensitive and precious image applications such as publishing. [0003] Digital watermarking technology can be used for image authentication, and has received great attention from researchers. Through the search, the relevant comparable authorized patents are as follows: [0004] [1] J.M.Barton, "Method and apparatus for embedding authe...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 梁小萍黄继武
Owner SUN YAT SEN UNIV
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