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Method for embedding reversible watermarks in duplex domains

A technology of embedding watermarks and watermarks, which is applied in image data processing, instruments, image data processing, etc., can solve the problems of enhancing the visibility of large-capacity watermark information images, and achieve the effect of improving visual quality, increasing capacity and image quality

Inactive Publication Date: 2016-03-23
JIUJIANG UNIVERSITY
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to propose a dual domain embedding reversible watermark method based on finite contrast enhancement combined with integer wavelet transform, which is used to solve how to realize the embedding of large-capacity watermark information, image The enhancement of visibility, and the restoration of the original image after watermark extraction, etc.

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  • Method for embedding reversible watermarks in duplex domains
  • Method for embedding reversible watermarks in duplex domains
  • Method for embedding reversible watermarks in duplex domains

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Embodiment Construction

[0022] Below in conjunction with accompanying drawing and example the present invention will be further described, see Figure 1-10 , a dual-domain embedding reversible watermarking method, the specific implementation mainly includes the data embedding process and the data extraction and image restoration process:

[0023] The data embedding: the data embedding includes two stages: the first stage is the spatial domain information embedding, and the second stage is the integer wavelet domain information embedding; first, the image is preprocessed in the spatial domain to avoid image pixel value overflow, that is, boundary pixel Perform appropriate expansion and reduction operations; then calculate a pair of peak points K of the image histogram D and K U , and K D U , and will be less than K D The pixel value minus 1, greater than K U Add 1 to the pixel value, and it will be equal to K D The pixel value of is subtracted from the watermark information to be embedded, which ...

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Abstract

The invention discloses a method for embedding reversible watermarks in duplex domains for digital copyright verification. The method comprises a data embedding process and a data extraction and image recovery process. By aiming at the defects of small embedding capacity and image visual quality reduction of a reversible watermark method provided in the prior art, the method is based on the limited contrast enhancement, and realizes a reversible watermark algorithm for performing duplex embedding in a space domain and a transform domain by combining integer wavelet transformation. Firstly, the watermark information is embedded in the space domain in a reversible way; the image visual quality is improved through controlling the contrast enhancement index; and then, the watermark embedding is performed by using a detail sub-band in the integer wavelet transform domain. The characteristics of the image contrast are hardly changed. More watermarks are embedded in the transform domain, so that the visual quality of the image subjected to the watermark embedding can be better improved; and meanwhile, more watermark information can be embedded. The watermark embedding capacity and the image quality are effectively improved.

Description

technical field [0001] The invention relates to the field of multimedia information security, and is applicable to a reversible watermark technology embedded in air domain and frequency domain at the same time, in particular to a double domain embedded reversible watermark method for digital copyright authentication. Background technique [0002] In recent years, with the widespread use of image processing tools and the popularization of Internet technology, digital image works are easy to be tampered with and distributed. In this case, digital watermarking technology came into being. However, the conventional digital watermarking algorithm will cause permanent distortion of the carrier image, which is not suitable for some special occasions, such as military images and medical images. Reversible watermarking can not only achieve image authentication through watermark extraction, but also can completely restore the original carrier image after watermark extraction, so revers...

Claims

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Application Information

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IPC IPC(8): G06T1/00
CPCG06T1/0071G06T2201/0203
Inventor 高光勇
Owner JIUJIANG UNIVERSITY
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