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Reversible data hiding method

A technology of data hiding and auxiliary information, applied in the field of data hiding, which can solve the problems of small embedding capacity, underutilization of multi-extreme blocks, and redundant pixels

Inactive Publication Date: 2016-03-23
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] 3. Although each block can embed a maximum of 2 bits of data, only the two ends of the gray value sequence are used, and the multi-extreme value blocks are not fully utilized, so the embedding capacity is small, and pixel redundancy needs to be further explored. further improvement

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Embodiment Construction

[0043] The invention relates to the technical field of data hiding, in particular to a reversible data hiding method. Reversible data hiding technology means that in the process of digital image processing, watermark information is embedded in the carrier image, and authorized users can extract the watermark information from the image after the watermark is embedded, and at the same time restore it to the original carrier image.

[0044]The idea of ​​the present invention is that after the image is divided into blocks, the pixel grayscale in each block has a maximum value and a minimum value, and for the entire original image, there may be many extreme values, including maximum values ​​and minimum values. When embedding using the first embedding method, only single extreme value pixels in the block are utilized. In order to better utilize the equal-extreme pixels of the block to carry information bits, the present invention proposes a second embedding method. Specifically, t...

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Abstract

The invention relates to a reversible data hiding method. The reversible data hiding method comprises: a step of pre-processing: partitioning an original pixel-domain image, and sorting according to a gray value in a block; a step of identifying: detecting and identifying a sorted sequence, and identifying a characteristic block; a step of embedding watermark information: embedding the watermark information in the characteristic block through a second embedding method; and a step of embedding auxiliary information: embedding corresponding auxiliary information. According to the invention, embedding of the watermark information according to requirements is realized; the equivalent maximum pixel redundancy in the image can be sufficiently mined; multi-bit embedding at one position is realized; the information capacity is effectively increased; and simultaneously, seamless fusion of a first embedding method and the second embedding method is effectively realized.

Description

technical field [0001] The invention relates to the technical field of data hiding, in particular to a reversible data hiding method, which can be applied in sensitive fields such as medicine, law and military affairs. Background technique [0002] Data hiding has become an area of ​​intensive research in recent years. During data hiding, most multimedia data hiding techniques modify and thus distort the overlay medium. Even though the distortion is usually small and imperceptible to the human visual system (HVS), it is usually not possible to fully restore the original overlay medium. In other words, most of these data hiding techniques are irreversible and unacceptable for some sensitive applications, such as legal and medical images. For legal, medical and other sensitive applications, reversible data hiding is required to extract the embedded data and restore the original subject signal, so the shortcomings brought by the existing technology really need to be improved....

Claims

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Application Information

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IPC IPC(8): G06T1/00
CPCG06T1/0021
Inventor 项洪印
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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