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Digital image evidence collecting method for detecting the multiple tampering based on the tone mode

A digital image and color tone technology, which is applied in the field of digital image forensics to detect various tampering, and can solve the problem of not getting good results

Inactive Publication Date: 2007-10-17
DALIAN UNIV OF TECH
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  • Summary
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Problems solved by technology

However, a falsified work often combines multiple tampering operations, and the influence of various operations on the image will restrict each other, making this type of detection technology often fail to achieve good results in practical applications.

Method used

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  • Digital image evidence collecting method for detecting the multiple tampering based on the tone mode
  • Digital image evidence collecting method for detecting the multiple tampering based on the tone mode
  • Digital image evidence collecting method for detecting the multiple tampering based on the tone mode

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Embodiment Construction

[0086] The specific implementation manner of the present invention will be described in detail below in combination with the technical scheme and accompanying drawings.

[0087] In order to test the effectiveness of the algorithm, the applicant took the Kodak DC290 camera as an example to analyze the properties of the uncompressed tif images captured by it. First, 100 original images with a resolution of 720*480 are taken as samples, and they are divided into overlapping 128*128 blocks (overlapping 3 / 4 blocks) for the balance of the number of sample data and positioning accuracy. A total of 100*228=22800 image blocks can be obtained, which are used to estimate μ and Σ of the F1 feature distribution of the original photo. At this time, we believe that the discreteness of the feature quantity distribution is within the normal range. If the distribution of the feature quantity F1 of the image to be tested is too far from the known distribution, we believe that a certain image blo...

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Abstract

The present invention belongs to the signal and information processing technology field and rlates to an evidence obtaining method for detecting a variety of digital image tampering. Said method is characterized in analyzing the resulting particular mode of color tone distribution according to particular relativity directed to pixels of each color channel during a signal processing course inside a digital camera, quantifying frequency spectrum character of the color tone mode, and further detecting whether a digital image has been tampered. The merits of the present invention is that it can effectively detect a variety of tamperings a digital image suffers and locate locally the pixel block suffering tamperings. The present invention is suitable for application in the information security field.

Description

technical field [0001] The invention belongs to the technical field of signal and information processing, and relates to a digital image forensics method for detecting the originality of a digital photo, in particular to a digital image forensics method for detecting multiple tampering based on tone patterns. Background technique [0002] Digital image forensics technology is used to judge the reliability of the source of an image and the integrity and authenticity of the content. At present, the existing digital image forensics technology can be divided into two categories: one starts from the properties of tampering operations, and designs algorithms based on the new characteristics introduced by various tampering operations. Such technologies include the utilization of Maximum likelihood estimation (Expectation Maximization, EM) method for detecting resampling and CFA [1], PCA-based method for detecting block copy-paste in a single image [2], and Shih-Fu Chang's method of...

Claims

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Application Information

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IPC IPC(8): H04N1/46H04N1/00G06T7/00
Inventor 孔祥维
Owner DALIAN UNIV OF TECH
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