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Digital image concealed information detecting and positioning method

A digital image and information detection technology, applied in the field of information security, can solve the problem of not being able to accurately determine the embedding position of hidden information

Inactive Publication Date: 2009-08-12
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

So far there is still no report that can accurately determine the embedding location of hidden information

Method used

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  • Digital image concealed information detecting and positioning method
  • Digital image concealed information detecting and positioning method
  • Digital image concealed information detecting and positioning method

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Embodiment Construction

[0039] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0040] Such as Figure 7 As shown, a kind of digital image hidden information detection and location method provided by the present invention comprises the following steps:

[0041] S101, using a block effect calculation method to detect whether the hidden digital image has been compressed in JPEG format;

[0042] S102. If the image is compressed by JPEG, then extract the quantization matrix of JPEG;

[0043] S103. Deduce the quantized DCT coefficients of the original image before embedding the hidden information according to the DCT coefficients of the hidden image;

[0044] S104. Recover the pixel values ​​of the original image according to the DCT coefficients of the original image, judge the embedding position of the hidden information according to the difference between the pixel values ​​of the original image ...

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Abstract

The invention relates to a method for detecting and positioning hidden information in a digital image, which comprises the following steps: detecting a digital image containing hidden information by using a blocking effect computing method; if the digital image is in a JPEG image compressed format, extracting a quantization matrix of the JPEG; deducing a quantization DCT coefficient of an original image before the embedment of the hidden information according to a DCT coefficient of the digital image; and restoring the pixel value of the original image according to the DCT coefficient of the original image, determining the embedment position of the hidden information according to the difference between the pixel values of the original image and the digital image, and estimating the embedding quantity of the hidden information. The technical proposal of the invention overcomes the drawback that the prior hidden information detection technology cannot accurately position the embedment position of the hidden information, and can detect and position hidden information hidden by various steganography algorithms in the digital image.

Description

technical field [0001] The invention relates to the field of information security, in particular to a method for detecting and locating secret information in digital images. Background technique [0002] Information hiding is actually hiding confidential information in common information without revealing any flaws. According to different carriers of hidden information, it can be divided into information hiding in images, videos, sounds, texts, etc. The hidden information can also be in the above various forms, but they are all treated as bit streams when hiding. The basic principle of information hiding is to make use of the insensitivity of the human sensory system to certain details, and to make some small changes to the carrier without arousing the suspicion of the observer. Different carriers have different characteristics. For example, image and video information hiding utilizes human visual characteristics, and the insensitivity to still images and video vision is di...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 黄继风
Owner SHANGHAI NORMAL UNIVERSITY
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