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Detection method for image fuzzy tampering

A tampering detection and image technology, applied in image enhancement, image analysis, image data processing and other directions, can solve the problems of not considering the influence of detection results, large amount of calculation and calculation time, etc., to enhance the edge of artificial blur, reduce The amount of computation and computation time, the effect of good artificially blurred edges

Inactive Publication Date: 2015-03-18
WUXI CINSEC INFORMATION TECH
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Problems solved by technology

However, each method has its disadvantages. The main disadvantage is that in order to determine the value of the cutoff frequency in homomorphic filtering, the calculation amount and calculation time of the algorithm are relatively large, and the proposed algorithm does not take into account the introduction of image noise and tampering operations. The influence of image noise on the detection results, so the shortcomings in these algorithms can be solved to improve the detection accuracy of the algorithm

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  • Detection method for image fuzzy tampering
  • Detection method for image fuzzy tampering
  • Detection method for image fuzzy tampering

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[0026] specific implementation plan

[0027] The present invention will be further described below in conjunction with accompanying drawings and examples.

[0028] 1 Homomorphic filtering based on wavelet decomposition

[0029] First, convert the image to be tested into a grayscale image, and perform logarithmic operation on the converted image; then perform wavelet decomposition on it, and wavelet transform can decompose the signal of the image into multiple high-frequency band signals and a low-frequency band signal , after j-level wavelet decomposition of the image, j groups of wavelet decomposition coefficients LH can be obtained j 、HL j 、HH j and LL j (j=1, 2, 3...); In the homomorphic filtering of wavelet decomposition, use the formula Replace D(u, v) / D in the traditional homomorphic filter function 0 , so there is a second-order Butterworth-type homomorphic filter function based on wavelet decomposition, as shown in formula (1):

[0030] H ...

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Abstract

The invention discloses a detection algorithm for image fuzzy tampering. The algorithm is one of important methods for taking the evidence of image tampering. Detection methods aiming at the image fuzzy tampering are different and are researched home and aboard. According to the method disclosed by the invention, a manual fuzzy edge of an image and the image contrast are enhanced by mainly utilizing homomorphic filtering of wavelet decomposition, and the edge characteristics of manual fuzzy tampering is highlighted; the influence on the detection effect caused by the noise o the image is eliminated through wavelet threshold de-noising, and meanwhile, the binary edge image information of the de-noised image is extracted; finally, the processed image is subjected to erosion operation according to the mathematical morphology of structural elements in four different directions, a normal edge which is not subjected to fuzzy enhancement is subjected to erosion shrinkage, and an enhanced image fuzzy edge is extracted, so that a fuzzy tampering area of the image is positioned, and the fuzzy tampering operation of the image is determined.

Description

technical field [0001] The invention relates to an image fuzzy tampering detection method of edge features, and belongs to the technical field of digital image forensics. Background technique [0002] In today's era of rapid development of digital information, digital images, as the most commonly used digital information carrier, are widely used in news, justice, science, entertainment, military and other fields. Sexuality has caused serious damage, hindered judicial justice, and affected social stability and order. Therefore, digital image forensics technology has become a very important direction in the field of information security technology research. [0003] The tampering of images mainly includes cutting out a part of one or several images, splicing them into another image, and so on. Any tampering operation will leave inevitable traces in the image. In order to make the tampered image feel more realistic and not easy to be found in the tampered area, the tamperer u...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
CPCG06T2207/20064
Inventor 胡成燕周治平耿振民
Owner WUXI CINSEC INFORMATION TECH
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