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Reversible data hiding method and recovering method

A data hiding and recovery method technology, applied in the field of data hiding, can solve the problems of pixel redundancy, small embedding capacity, and insufficient utilization of multi-extreme value blocks.

Inactive Publication Date: 2016-03-30
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

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

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  • Reversible data hiding method and recovering method

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Embodiment Construction

[0079] 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.

[0080] The inventive 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 divided pixels with equal extreme values ​​to carry information bits, the present invention proposes a second embedding meth...

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Abstract

The invention relates to a reversible data hiding method and a recovering method. The reversible data hiding method comprises a preprocessing step in which an original pixel-domain image is divided into blocks and the blocks are sorted according to the gray values, a marking step in which the sequence after sorting is detected and identified and feature-class blocks are marked, a watermark information embedding step in which watermark information is embedded into the feature-class blocks through a second embedding method, and an auxiliary information embedding step in which corresponding auxiliary information is embedded. According to the invention, on-demand watermark information embedding is realized, equal-maximum pixel redundancy in the image is fully exploited, 'one-position multi-bit embedding' is realized, and the information capacity is improved effectively. Meanwhile, seamless integration of a first embedding method and the second embedding method is achieved effectively.

Description

technical field [0001] The invention relates to the technical field of data hiding, in particular to a reversible data hiding method and a recovery 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 reall...

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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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