Asymmetric JPEG steganographic method based on elimination of blocking effect

A block effect and asymmetric technology, applied in image data processing, instruments, image data processing, etc., can solve the problems of reducing image visual quality, block effect, etc., and achieve the effect of improving security and avoiding block effect

Inactive Publication Date: 2018-08-17
SUN YAT SEN UNIV
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Problems solved by technology

[0003] In the JPEG compression of JPEG steganography, the discrete cosine transform (DCT, DiscreteCosine Transform) will be performed in units of 8×8 blocks. Although the discrete cosine transform has good compression characteristics and is widely used in image and video compression, it will Causes a more obvious block effect and reduces the visual quality of the image

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  • Asymmetric JPEG steganographic method based on elimination of blocking effect
  • Asymmetric JPEG steganographic method based on elimination of blocking effect
  • Asymmetric JPEG steganographic method based on elimination of blocking effect

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[0047] The accompanying drawings are for illustrative purposes only and cannot be construed as limiting the patent;

[0048] In order to better illustrate this embodiment, some parts in the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0049] For those skilled in the art, it is understandable that some well-known structures and descriptions thereof may be omitted in the drawings.

[0050] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0051] An asymmetric JPEG steganography method based on eliminating blocking artifacts, such as figure 1 shown, including the following steps:

[0052] S1. Extract the DCT coefficient C and the quantization table q_tab of the carrier image to obtain secret information;

[0053] S2. Decompress the DCT domain into the air domain according to the DCT coefficients, and obtain the air domain pixe...

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Abstract

The invention discloses an asymmetric JPEG steganographic method based on elimination of a blocking effect. An image is decompressed from a DCT domain to a spatial domain, the compressed image is changed under the condition that the size of the image is not changed, a changed image is obtained, and a quantization table of the original image is converted into a DCT domain of the changed image; a cost value of the original image is calculated, both the original image and the changed image are cut, a cost value corresponding to a marking coefficient is adjusted, and a cost value of the changed image is obtained; and secret information is embedded into the changed image via the cost value of the changed image and a coding algorithm by taking the original image as a carrier, and a final steganographic image is obtained. According to the provided steganographic method, the safety of the steganographic method is improved without influence on the embedding amount and algorithm efficiency of apresent steganographic method, and possible blocking effect caused by routine DCT is avoided.

Description

technical field [0001] The invention relates to the field of data steganography, and more specifically, relates to an asymmetric JPEG steganography method based on eliminating block effects. Background technique [0002] At present, with the wide application of the Internet, people can easily complete the interaction and transmission of information. How to safely transmit secret information is an important problem in the field of secret communication. Steganography is an effective method to solve the problem of communication security. It can embed secret information into digital media in a certain way without damaging the audio-visual quality of the carrier, so that information can be safely transmitted in open channels without causing serious problems. Third party attention. Joint Photographic Experts Group (JPEG) compressed image is currently the most widely used image format on the Internet and is an important carrier of secret information. Therefore, JPEG steganography ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
CPCG06T1/0021
Inventor 何俊奇黄方军
Owner SUN YAT SEN UNIV
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