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Method and device for embedding and extracting reversible watermarking as well as method and device for recovering image

A watermark embedding and watermarking technology, applied in the field of image information security, can solve the problem of large embedding space

Active Publication Date: 2011-09-21
PEKING UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reversible watermark embedding method used in the prior art needs to occupy a large embedding space

Method used

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  • Method and device for embedding and extracting reversible watermarking as well as method and device for recovering image
  • Method and device for embedding and extracting reversible watermarking as well as method and device for recovering image
  • Method and device for embedding and extracting reversible watermarking as well as method and device for recovering image

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Embodiment Construction

[0040] A reversible watermark embedding and extraction method and device and an image restoration method and device provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0041] First of all, the integer variation method mentioned in the present invention is described in detail; the process of embedding a watermark by the integer variation method is as follows:

[0042] Let: x be an integer, define the following three functions:

[0043]

[0044]

[0045] g(x)=LSB(x)=2f(x)-x=x-2h(x)

[0046] in, and They are upper rounding and lower rounding operations respectively.

[0047] For a vector x=(x with n elements 0 , x 1 ,...,x n-1 ), and also define three functions:

[0048] α(x)=round(x)

[0049] v ( x ) = Σ i = 0 n ...

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Abstract

The embodiment of the invention discloses a method and device for embedding and extracting a reversible watermarking as well as a method and device for recovering an image and relates to the technical field of image information safety. The method for embedding the reversible watermarking provided by the embodiment of the invention comprises the following steps: acquiring congregation classification information and watermarking information of a macro-block in an original image, wherein the congregation classification information comprises a first congregation, a second congregation and a third congregation; establishing a position chart related to an embedded quantity for each macro-block in the first and second congregations; and embedding the information in the position chart related to the embedded quantity and the watermarking information into the corresponding macro-blocks, according to the arrayed sequence of the macro-blocks and the congregation classification of the macro-blocks. By using the method provided by the embodiment of the invention, the embedding volume is increased and the embedding distortion is reduced.

Description

technical field [0001] The invention relates to the technical field of image information security, in particular to a reversible watermark embedding and extraction method and device, and an image restoration method and device. Background technique [0002] At present, with the rapid development and wide application of multimedia digital communication technology, media information such as images, audio and video has become a part of people's daily life. Due to the strong portability, efficiency, speed and accuracy of media information, piracy, modification and dissemination of media information become easy. In order to cope with this situation, adding digital watermark in multimedia can solve this problem well. The digital watermarking technology refers to the use of signal processing methods to embed identification signals in media information. The identification signals can be invisible or visible. By extracting these identification signals, it is possible to realize copyr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00G06T5/00
Inventor 郭宗明王祥李晓龙杨斌
Owner PEKING UNIV
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