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Image reliability detecting method based on edge direction characteristic

A detection method and edge direction technology, applied in the field of blind detection of image content authenticity, can solve the problem of ineffective detection of image authenticity

Inactive Publication Date: 2009-07-29
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0008] In order to overcome the shortcomings of existing technologies that cannot effectively detect the authenticity of images, the present invention provides an image credibility detection method based on edge direction features, which summarizes the possible flaws in forged images, and analyzes the possible legacy of the image forgery process. Reliable evaluation of the authenticity of the image content information, making up for the lack of arbitrary detection results, making the detection results more reasonable and reliable

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  • Image reliability detecting method based on edge direction characteristic
  • Image reliability detecting method based on edge direction characteristic
  • Image reliability detecting method based on edge direction characteristic

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Embodiment Construction

[0071] In order to facilitate the detection of image forgery, the research team established a database of forged images classified by specific tampering methods. There are currently nearly 4000 images. The image database includes both simple operations such as direct stitching, and complex operations such as retouching and retouching simple forged images; there are both images processed by a single tool, and images processed by multiple tools. The image library enables research from From simple to complex step by step, it is helpful to improve the feasibility analysis of the algorithm.

[0072] Examples of the present invention figure 1 Shown, where figure 1 (a), figure 1 (b) is the original image, figure 1 (c) is a forged image, it is the original figure 2 Copy the tower in (b) to figure 2 (a) Obtained from the appropriate position in the figure, and used post-processing operations such as edge blur. We use edge direction features to fake images figure 2 (c) Perform testin...

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Abstract

The invention discloses an image credibility testing method on the basis of characteristics of edge direction, which utilizes vector gradient to solve the gradient direction angle Theta (x, y) which is equal to (1 / 2) arctan (2gxy / (gxx-gyy)) of an image to be tested so as to solve the direction characteristic K of pixel dots in the image to be tested; all doubtful points and forgery points in the image are found; the numbers of the doubtful points and the forgery points are respectively recorded as num1 and num 2; the credibility of the image is equal to 1-(num 2 / num 1); the forgery points and non-forgery points are expressed with two different gray levels respectively, thus obtaining an binary image; and morphology operation is carried out to the forgery points in the binary image to obtain a forgery area. The method expresses tested results in the form of credibility and overcomes the defect that the tested results of the existing algorithm are relatively arbitrary.

Description

Technical field [0001] The invention relates to the field of image content information security, in particular to a blind detection method for the authenticity of image content. Background technique [0002] The current protection of digital image content is mainly realized by using digital watermarking and signature technology. The basic idea adopted by these technologies is to authenticate the authenticity of the image by adding additional information. However, most images currently do not contain digital watermarks or signatures. With the popularization and popularity of digital cameras and image processing software, more and more high-quality forged images are disseminated in large numbers through the Internet, making people’s “sights” no longer “being believable”, resulting in politics, culture, news, and science. Negative effects on authenticity and other aspects. Furthermore, the existence of a large number of fake photos is likely to affect the public's personal awareness...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 郑江滨李哲刘苗
Owner NORTHWESTERN POLYTECHNICAL UNIV
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