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Method for detecting content reliability of digital picture by utilizing gradient local entropy

A digital image and local entropy technology, applied in image analysis, image data processing, instruments, etc., can solve problems such as inability to effectively detect the authenticity of images

Inactive Publication Date: 2010-10-13
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0008] In order to overcome the deficiency that the existing technology cannot effectively detect the authenticity of images, the present invention provides a method for detecting the credibility of digital image content using gradient local entropy, summarizing the possible flaws in forged images, and analyzing the process of image forgery 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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  • Method for detecting content reliability of digital picture by utilizing gradient local entropy
  • Method for detecting content reliability of digital picture by utilizing gradient local entropy
  • Method for detecting content reliability of digital picture by utilizing gradient local entropy

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Embodiment Construction

[0054] 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 stitching, 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.

[0055] An example of the present invention is 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 1 Copy the head of the girl in (b) to figure 1 (a) The head of the girl on the left in the picture is obtained, and the edge blur operation is used for the fake head. We use the gr...

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Abstract

The invention discloses a method for detecting the credibility of digital image content by utilizing gradient local entropy; as for three channels of an RGB colored image, edge detection arithmetic operators are respectively used for convoluting to obtain a derivative of a color vector (R, G, B); as for each pixel dot (x, y) in the image, gxx, gyy and gxy are respectively calculated; as for each pixel dot in the image, a gradient direction angle theta and a gradient amplitude F theta are respectively calculated; a gradient amplitude image F theta is taken as an edge image; local information entropy is defined and obtained from a gradient image; and a local entropy image is combined with the gradient image to position eclosion marks and evaluate the credibility of the image. The method overcomes the defect that the detection result of the former algorithm is relatively arbitrary and has relatively great practicality.

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...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00
Inventor 郑江滨李哲
Owner NORTHWESTERN POLYTECHNICAL UNIV
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