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Semi-fragile digital watermaking system based on non-redundant Contourlet conversion

A digital watermarking, non-redundant technology, applied in image data processing, instruments, electrical components, etc., can solve the problems of difficulty in combining robustness and semi-fragility, low inspection accuracy, and difficulty in tampering area authentication and positioning. Achieve the effect of improving detection accuracy, achieving authentication and positioning

Active Publication Date: 2009-10-28
HANGZHOU HIKVISION DIGITAL TECH
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  • Abstract
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Problems solved by technology

[0017] The technical problem to be solved by the present invention is how to design a watermarking system that can accurately realize tampering area authentication and location. Low inspection accuracy, difficulty in authentication and positioning of tampered areas, difficulty in balancing robustness and semi-fragility, etc.

Method used

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  • Semi-fragile digital watermaking system based on non-redundant Contourlet conversion
  • Semi-fragile digital watermaking system based on non-redundant Contourlet conversion
  • Semi-fragile digital watermaking system based on non-redundant Contourlet conversion

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Embodiment Construction

[0070] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0071] figure 1 is the module relationship diagram of the watermarking system. As shown in the figure, the semi-fragile digital watermarking system based on non-redundant Contourlet transform includes five parts: watermark generation module, watermark embedding module, watermark extraction module, watermark detection module and watermark authentication module. Watermark generation module: when the size of the original image is m×m, a watermark with a size of (m / 4×m / 4) is generated, and the watermark is composed of a pseudo-binary random sequence {0, 1}.

[0072] figure 2 It is the workflow diagram of the watermark embedding module. As shown in the figure, in the watermark embedding module, first, the original image is decomposed by two-level non-redundant Contourlet transform to obtain 12 subbands, and 12 sets of parent-child coefficient relationsh...

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Abstract

The invention provides a semi-fragile digital watermaking system based on non-redundant Contourlet conversion, which can complete watermak embedding by regulating the magnitude relationship of parent-child coefficients. By utilizing the semi-fragile characteristic of the parent-child coefficients, the invention can get robustness to JPEG compression, JPEG 2000 compression, Gaussian noise adding, Gaussian filtering and contrast stretching operation, but has vulnerability to replication and pasting baleful operation with change of work content information. An experimental result shows that the semi-fragile digital watermaking system of blind detection proposed by people can ensure that certification and location of tampering a region are accurately realized under the conditions of the false alarm rate being lower than 6.5 percent and MDR being lower than 1 percent. By utilizing the parent and child relationship of WBCT region, the system enhances the detection accuracy rate of tampering the region when being in associated attack by the baleful operation and non baleful operation.

Description

technical field [0001] The invention relates to the technical field of digital watermarking, in particular to a semi-fragile digital watermarking system based on non-redundant Contourlet transformation. Background technique [0002] An important application of digital watermarking is to realize the authentication of the integrity and authenticity of data content. The widely used Adobe Photoshop software can easily modify an image. And if this image is a legal and political image and will be used as evidence in court, then the tampering will cause serious problems, and even make good people wronged and bad people get away with it. The same problem exists for audio and video data. In other fields, such as remote sensing applications, news reports, medical achievements, arbitrary tampering of image content will cause serious consequences. [0003] One of the means to solve this problem is the digital signature technology derived from cryptography. Digital signature technolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/32G06T9/00G06T7/00
Inventor 黄添喜段贵多胡扬忠邬伟琪
Owner HANGZHOU HIKVISION DIGITAL TECH
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