Watermark image restoration method based on SLT-DM

A technology for watermarking images and image sub-blocks, applied in image watermarking, image data processing, image data processing, etc., to achieve the effect of high computational complexity and fully reversible restoration

Active Publication Date: 2019-03-19
CENT SOUTH UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0007] Considering that none of the existing image reversible methods can solve the image overflow problem well, the present invention provides a watermark image restoration method based on SLT (Slantlet transform, Slantlet transform)-DM (Dither Modulation, jitter modulation). The image and the amount of change caused by anti-overflow processing are embedded in the frequency domain of the image, so that the image can be completely reversibly restored after embedding watermark and anti-overflow processing without any additional information

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Embodiment Construction

[0073] This embodiment considers the overflow problem faced by the robust reversible watermarking algorithm, and intends to effectively and simply avoid the overflow problem without causing other problems without destroying the invisibility and embedding capacity of the watermark.

[0074] The present invention designs an anti-overflow jitter modulation module, and provides a robust reversible image watermarking method based on SLT-DM, such as figure 1 As shown, there are three processes including watermark embedding, watermark extraction and image restoration.

[0075] Among them, the watermark embedding process is as follows: figure 2 shown, including:

[0076] Step A10, original image preprocessing.

[0077] If the original image is a color image, the G channel layer of the original image is taken as the preprocessed image; if the original image is a grayscale image, the original image is used as the preprocessed image; the preprocessed image is divided into different si...

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Abstract

The invention discloses a watermark image restoration method based on SLT-DM. The method includes firstly, the overflow problem caused by watermark embedding is eliminated through anti-overflow treatment; an anti-overflow jitter modulation method is adopted; a change amount caused by watermark embedding and image overflow processing and a change amount caused by jitter modulation are synthesized into restoration information, and the restoration information is embedded into an image without overflow. the restoration information is controlled to be smaller than the quantization step length of half jitter modulation; therefore, the restored information does not jump out of the jitter interval when added to the first low-frequency coefficient, complete reversible restoration of the image is ensured, any additional information is not needed for restoration, and other problems of reducing the embeddable capacity, influencing the image quality, increasing the additional information and the like are not caused.

Description

technical field [0001] The invention belongs to the technical field of image digital watermarking, in particular to a method for restoring watermarked images based on SLT-DM for medical imaging systems, military imaging systems and other application fields with high non-destructive requirements. Background technique [0002] With the development of Internet technology and the innovation of new media technology, breakthroughs have been made in digital media technology, which has changed the dominant position of traditional media in the process of information dissemination. While digital media is becoming more abundant, a series of information about them Problems also arise. Among them, how to effectively protect the copyright of digital media and prevent digital media from being illegally copied or used has become an important aspect. Digital Right Management (DRM) is currently the main means of copyright protection for digital media disseminated in the network, and digital ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
CPCG06T1/005G06T2201/0065
Inventor 刘熙尧王一帆楼杰挺张雅云廖胜辉邹北骥
Owner CENT SOUTH UNIV
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