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Image reversible information hiding method and system based on DCT coefficient correlation

A technology of information hiding and correlation, applied in image communication, digital video signal modification, electrical components, etc., can solve the problem of no major breakthrough in embedded capacity, achieve good visual quality, increase embedded capacity, and reduce distortion

Active Publication Date: 2021-11-19
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the inventor found that the embedding capacity of this type of method is limited by the number of DCT AC coefficients selected after quantization, and most of the improved methods focus on image quality and file size, and there is no major breakthrough in embedding capacity

Method used

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  • Image reversible information hiding method and system based on DCT coefficient correlation
  • Image reversible information hiding method and system based on DCT coefficient correlation
  • Image reversible information hiding method and system based on DCT coefficient correlation

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Embodiment 1

[0044] The purpose of this embodiment is to provide an image reversible information hiding method based on DCT coefficient correlation.

[0045] First of all, it needs to be explained that in the traditional Jpeg image reversible information hiding method, it is found that the DC coefficients in the quantized DCT coefficients approximately obey the Gaussian distribution, and most of the values ​​of the DC coefficient histogram at the highest point do not exceed 120, then use the histogram In the method of image shifting, the capacity of embedding watermark information is small, and the distortion is large. However, the histogram distribution of the AC coefficient is peak-shaped, so it is very suitable to apply the method of histogram shift to the AC coefficient. However, embedding information in the coefficient with a value of "0" will greatly affect the codeword of entropy encoding, and the file storage will change greatly, which will affect the transmission efficiency of the...

Embodiment 2

[0121] The purpose of this embodiment is to provide an image reversible information hiding system based on DCT coefficient correlation.

[0122] An image reversible information hiding system based on DCT coefficient correlation, comprising:

[0123] A DCT coefficient acquisition unit, which is used to divide the original JPEG image into non-overlapping blocks, and perform entropy decoding to obtain its quantized DCT coefficients;

[0124] A double-layer sorting unit, which is used to sort the blocks using a double-layer sorting method, and calculate the correlation of the blocks in the horizontal and vertical directions;

[0125] An error prediction unit, which is used to select an optimal block as a prediction block and calculate a prediction error to generate a prediction error histogram;

[0126] An information embedding unit, which is used to select an embedding point according to the prediction error histogram, obtain an embedding space by translation, and embed secret i...

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Abstract

The invention provides an image reversible information hiding method and system based on DCT coefficient correlation. According to the scheme, the method comprises the following steps: calculating a predicted value of an image block by utilizing the correlation of coefficients at the same position of adjacent DCT blocks, manufacturing more embedding bits, and embedding secret information into a carrier image by utilizing a prediction error; when an embedded block is selected, carrying out the global sorting and local sorting: according to the number of non-zero coefficients of each quantized DCT block, carrying out sorting from small to large, carrying out the correlation sorting on the DCT blocks with the same number of non-zero coefficients, selecting an image block with the large correlation preferentially as the embedded block, and then carrying out gradient sorting on adjacent blocks of the image block to select the most prediction block. According to the scheme, the maximum embedding capacity is improved, and meanwhile, lower file increment and good visual quality are kept.

Description

technical field [0001] The disclosure belongs to the technical field of multimedia information security, and in particular relates to an image reversible information hiding method and system based on DCT coefficient correlation. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] Reversible data hiding algorithm (Reversible Data Hiding, RDH) is an important branch in the field of information hiding. After the algorithm embeds secret information into the carrier data, it can completely extract the secret information and restore the carrier data without loss. It is widely used in medical and military applications. And digital forensics and other fields that require high digital images. In 1997, J.M.Barton proposed the concept of reversible information hiding. Afterwards, a large number of reversible information hiding schemes have been propos...

Claims

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Application Information

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IPC IPC(8): H04N1/32H04N19/91H04N19/625H04N19/129H04N19/124
CPCH04N1/32267H04N19/91H04N19/625H04N19/129H04N19/124Y02D10/00
Inventor 马宾张泽霖马睿和徐健王春鹏李健周林娜
Owner QILU UNIV OF TECH