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Image reliability detecting method based on edge direction characteristic

A technology of edge direction and detection method, applied in image data processing, image data processing, instruments, etc., can solve problems such as inability to effectively detect the authenticity of images

Inactive Publication Date: 2011-04-27
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 has established a database of forged images classified by specific tampering methods, and there are currently nearly 4,000 images. In the image database, there are not only simple operations such as direct splicing, but also complex operations such as retouching and retouching simple forged images; there are images processed by a single tool, and images processed by a combination of multiple tools. The image database enables research from Step by step from simple to complex is conducive to improving the feasibility analysis of the algorithm.

[0072] Examples of the present invention are figure 1 shown, where figure 1 (a), figure 1 (b) is the original image, figure 1 (c) For fake images, it is the original figure 2 The column in (b) is copied to figure 2 (a) It is obtained at the appropriate position in the figure, and post-processing operations such as edge blurring are used. We use the ed...

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Abstract

The invention discloses an image credibility testing method based on edge direction characteristics, which comprises: utilizing a vector gradient to solve a gradient direction angle Theta (x, y)=(1 / 2)*arctan(2gxy / (gxx-gyy)) of an image to be tested so as to solve a direction characteristic K of pixel dots in the image to be tested; finding out all doubtful dots and forgery dots in the image; respectively recording the numbers of the doubtful dots and the forgery dots as num1 and num 2; the image credibility=1-(num2 / num1); respectively expressing the forgery dots and non-forgery dots with two different gray levels, thus obtaining an binary image; and performing a morphology operation to the forgery dots 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 prior 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] At present, the protection of digital image content is mainly realized by using digital watermark and signature technology. The basic idea adopted by these technologies is to verify the authenticity of the image by adding additional information. However, most images currently do not contain digital watermarks or signatures. With the popularity and popularity of digital cameras and image processing software, more and more high-quality forged images are disseminated through the Internet, making people's "seeing" no longer "true", causing political, cultural, news and scientific Negative effects on authenticity, etc. Furthermore, the existence of a large number of forged photos is likely to affect the public's personal awareness, and eventually make people lose trust in p...

Claims

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Application Information

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