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Robust watermark technique of digital image selected from space domain of images

A technology of digital image and watermark technology, applied in image data processing, image data processing, instruments, etc., can solve problems such as poor robustness, achieve improved security and robustness, good robustness, and improved confidentiality and safety effects

Inactive Publication Date: 2007-07-25
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] Most of the digital watermarking schemes currently proposed can only resist several common attacks, such as image compression, filtering, noise attacks and other signal processing operations.
It is less robust to translation, rotation, stretching and even tiny geometric attacks.

Method used

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  • Robust watermark technique of digital image selected from space domain of images
  • Robust watermark technique of digital image selected from space domain of images
  • Robust watermark technique of digital image selected from space domain of images

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Embodiment Construction

[0024] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0025] First use a set of binary sequences B={b that can represent copyright information 0 , b 1 ,...,b L-1}, b i ∈{-1, 1} is used as a digital watermark, and the original image is denoted as X={x(i,j)|i≤M 1 , j≤M 2}, where M 1 × M 2 is the size of the image, x(i, j) is the pixel value of the image, and the embedding process of the watermark is shown in Figure 2 as follows:

[0026] Step 1. For the original watermark information B={b 0 , b 1 ,...,b L-1}Divided into i grades G according to the importance 1 , G 2 ...... G i , the importance decreases with the increase of i, where G 1 for Most importantly, G 2 for less important, G i least important. Orthogonal spread spectrum processing is carried out with the orthogonal variable length spread spectrum OVSF code, and the important part G 1 Spread with a longer OVSF code with a spreading fa...

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Abstract

A method for embedding watermark on robust digital image of airspace image includes using chose sequence generated by cipher key to select initial image pixel block, seeking optimum matched block with said pixel block in complete image, recombining them as per their generated order and making DWT conversion, dividing watermark information as per their importance, realizing unequal error protection by utilizing orthogonal variable length OVSF code spread spectrum treatment and embedding spread spectrum watermark into DWT wavelet coefficient. The method for picking up watermark is also disclosed.

Description

technical field [0001] The invention relates to a robust digital image watermarking technology based on airspace image selection, is a multimedia data protection method, and belongs to the field of multimedia signal processing. Background technique [0002] With the continuous development of multimedia technology, the copyright issue of digital works has become a focus of attention. In order to solve this problem, digital watermarking technology has been proposed internationally. Digital watermarking technology is a new information security technology that combines signal processing, digital communication, pattern recognition, cryptography and Internet technologies. It provides a new way of thinking for copyright protection. At present, digital watermarking technology is one of the effective methods to protect digital media copyright. [0003] Digital watermarking technology confirms the ownership of the data by embedding watermark information in the original data without ...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 费泽松孟维娟匡镜明
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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