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Double compression detection method and system of joint photographic experts group (JPEG) image

A technology of double compression and detection method, applied in the field of image processing, can solve the problems of unstable double compression detection effect, time-consuming classifier, redundancy and so on.

Active Publication Date: 2012-04-11
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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Problems solved by technology

[0012] The distinguishing features extracted by these methods have not been effectively refined and have great redundancy, resulting in redundant feature vectors, time-consuming classifier training process, and the double compression detection effect of different quality factor combinations is not stable enough

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  • Double compression detection method and system of joint photographic experts group (JPEG) image
  • Double compression detection method and system of joint photographic experts group (JPEG) image

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Embodiment Construction

[0071] Such as figure 1 Shown, be the flow chart of JPEG image double compression detection method, comprise the following steps:

[0072] Step S110, correcting the JPEG image to be detected to obtain a reference image.

[0073] In the present embodiment, rectifying refers to carrying out JPEG compression to the luminance value matrix after deleting row and column with luminance quantization table, specifically comprises the following steps:

[0074] ① Read the luminance quantization table of the JPEG image to be detected, and decompress the JPEG image to obtain a luminance value matrix.

[0075] ② Delete row a and column b of the luminance value matrix.

[0076] ③ performing JPEG compression on the luminance value matrix after partial row and column deletion using the luminance quantization table to obtain a reference image.

[0077] In this embodiment, the luminance quantization table of the JPEG image is read as auxiliary information, and the JPEG image to be detected is...

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Abstract

The invention discloses a double compression detection method of a joint photographic experts group (JPEG) image. The method comprises the following steps of: correcting a JPEG image to be detected to obtain a reference image; extracting histograms of quantization discrete cosine transform (DCT) parameters of the JPEG image to be detected and the reference image, and calculating a characteristic value of each frequency according to the histograms; and performing pattern recognition on the characteristic values by using a trained classifier, and judging whether the JPEG image to be detected is subjected to double compression. In the double compression detection method of the JPEG image, because only one characteristic value of each frequency of the JPEG image to be detected and the reference image is extracted, the number of the characteristic values is small, and the training time of the classifier is short; and the characteristic values are effectively extracted, so that judgment accuracy rate is high, and performance is stable. Moreover, the invention also provides a double compression detection system of the JPEG image.

Description

【Technical field】 [0001] The invention relates to image processing technology, in particular to a JPEG image double compression detection method and system. 【Background technique】 [0002] JPEG (Joint Photographic Experts Group, Joint Photographic Experts Group) lossy compression technology can effectively remove redundant image information (such as visual redundancy, frequency redundancy, etc.), has a high file compression rate and detail fidelity, and Provides a mechanism for trade-off between the two (by choosing different compression quality factors), so it is widely used in image ingestion equipment and network transmission. However, the rapid development of image processing technology makes it easier to tamper with JPEG images without leaving visual traces; the maturity of image steganography technology also makes the number of JPEG images carrying secret information on the Internet more and more. If these forged images or images carrying secret information cannot be ...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/30H04N7/64H04N19/124H04N19/136H04N19/176H04N19/625H04N19/70H04N19/89
Inventor 杨建权史芳玲朱国普黄继武
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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