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Image true-false detection method based on chaos sequence and singular value decomposition

A singular value decomposition, chaotic sequence technology, applied in the field of image recognition, can solve the problems of large additional information, can not achieve blind detection, difficult to practical application, etc., to achieve the effect of blind detection and good robustness

Inactive Publication Date: 2010-02-17
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, this method stores most of the watermark information in the unitary matrix, and these unitary matrices need to be transmitted outside the watermarked picture, so the additional information of the watermark detection generated is larger than that of the carrier picture, and blind detection cannot be realized; and Since there is very little watermark information in the carrier image, the multiplication of this carrier image with other irrelevant watermarked unitary matrices can even obtain completely different watermark information, so this method is difficult to apply in practice

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  • Image true-false detection method based on chaos sequence and singular value decomposition
  • Image true-false detection method based on chaos sequence and singular value decomposition
  • Image true-false detection method based on chaos sequence and singular value decomposition

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Embodiment Construction

[0020] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0021] This embodiment adopts LENA format pictures, and sets the size of the interval Δq i =17; and the STUFF picture, set the size of the interval Δq i The 512×512 grayscale (color) picture of =12 is the watermark carrier picture; in order to accurately locate the image tampering position, the size of the block is 4×4; it is measured by PSNR (peak signal-to-noise ratio) and MSE (mean square error) The change of picture quality, this embodiment specifically comprises the following steps:

[0022] The first step, at the image watermark embedding end: first divide the watermark carrier image into blocks with a pixe...

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Abstract

The invention relates to an image true-false detection method based on a chaos sequence and singular value decomposition, belonging to the technical field of image recognition and comprising the following steps: firstly, using key information related to an image owner as an initial value to generate a chaos sequence; blocking carrier images and carrying out SVD (singular value decomposition) on the carrier images; extracting the largest singular value and quantifying the largest singular value decomposition according to the bit of the chaos sequence and finishing the embedding of a watermark,when testing whether the images are falsified or not, extracting the largest singular value of sub-image blocks first, obtaining the embedded watermark bit by carrying out comparison according with acertain rule with a quantization table and using a key same with an embedding end to generate the chaos sequence; and knowing whether the images are falsified or not and the falsified area by comparing the extracted watermark bit with the chaos sequence bit. The image true-false detection method controls the influence of the embedded watermark on the image quality in a controllable method and canrealize blind detection without extra information during detection.

Description

technical field [0001] The invention relates to a method in the technical field of image recognition, in particular to an image authenticity detection method based on chaotic sequence and singular value decomposition. Background technique [0002] The wide application of digital images has brought about the problem of identifying the authenticity of its content. Especially with the emergence of various high-quality and high-precision image processing equipment and a large number of digital image processing software, it is more convenient to edit and modify digital images. Aiming at the problem of image authenticity identification, semi-fragile digital watermarking technology is mainly used as an identification tool for information integrity. However, many images in practical applications have been compressed by JPEG (Joint Photographic Experts Group) and JPEG2000 formats, and the existing digital watermarked image authenticity detection methods are rarely able to resist the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 李建华李生红赵峰金波李剑李琳
Owner SHANGHAI JIAO TONG UNIV
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