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Methof for embedding and extracting watermark based on statistical model of coefficient in transform domain of digital images

A watermark embedding, digital image technology, applied in the field of information hiding and digital watermarking

Inactive Publication Date: 2007-07-25
PEKING UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

None of the above digital watermarking methods can fully meet these two requirements.

Method used

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  • Methof for embedding and extracting watermark based on statistical model of coefficient in transform domain of digital images
  • Methof for embedding and extracting watermark based on statistical model of coefficient in transform domain of digital images
  • Methof for embedding and extracting watermark based on statistical model of coefficient in transform domain of digital images

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Embodiment Construction

[0050] The specific embodiment of the present invention will be further described below in conjunction with the accompanying drawings.

[0051] 1: Watermark embedding process

[0052] As shown in Figure 1, a method for embedding a watermark in a digital image comprises the following steps:

[0053] (1) Divide a grayscale image (or a channel of a color image) as shown in Figure 2 into N×N blocks, and then perform two-dimensional DCT transformation on each image block to obtain transform domain coefficients. In this embodiment, the size of the image block is taken as N=8. Specifically, assume that the grayscale image (or one channel of a color image) is

[0054] X = { x n , m k : 0 ≤ n ≤ 7,0 ≤ m ≤ 7,1 ≤ k ≤ K ...

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Abstract

A method for embedding and picking up digital watermark based on digital image transform coefficient statistic model includes making desired value of image sub-block DCT transform be positive or be negative by changing distribution of alternating-current coefficient on image sub-block DCT transform, enabling to embed and to pick up digital watermark before and after printing and scanning as said property can be remained still after image is printed and scanned.

Description

technical field [0001] The invention belongs to the technical field of information hiding and digital watermarking, and specifically relates to a digital watermarking method based on a statistical model, in particular to a digital watermark embedding and extraction method based on a statistical model of coefficients in a digital image transformation domain. Background technique [0002] The rapid development of digital network technology puts forward new and higher requirements for multimedia copyright protection and content identification. Digital watermarking technology is gradually developed in response to this requirement. The so-called digital watermarking (Digital Watermarking) is to use the insensitivity of human vision or hearing to add some redundant information to multimedia data (such as images, audio, video and other digital signals) to achieve the purpose of information hiding, so that the copyright statement , licensing conditions, etc. for intellectual propert...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 李晓龙亓文法程道放
Owner PEKING UNIV
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