Anti-geometry attack robust watermarking method based on steady circular area

An anti-geometric attack, circular area technology, applied in the multimedia field, can solve the problems of insufficient stability of feature points, interpolation errors, affecting watermark performance, etc.

An anti-geometric attack, circular area technology, applied in the multimedia field, can solve the problems of insufficient stability of feature points, interpolation errors, affecting watermark performance, etc.

CN101246589AInactive Publication Date: 2008-08-20BEIJING JIAOTONG UNIV
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  • Anti-geometry attack robust watermarking method based on steady circular area
  • Anti-geometry attack robust watermarking method based on steady circular area
  • Anti-geometry attack robust watermarking method based on steady circular area

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Embodiment Construction

[0061] The present invention will be further described below in conjunction with accompanying drawing.

[0062] Such as figure 1 As shown, the specific embodiment of the present invention mainly includes the following five steps in the watermark embedding stage:

[0063] Step 101, extracting edge curves.

[0064] A. Use the canny operator to extract the edge curve of the image

[0065] The ridge pixels of the canny operator use two thresholds T 1 and T 2 do thresholding, where T 1 2 . value greater than T 2 The ridge pixels are called strong edge pixels, at T 1 and T 2 The ridge pixels between are called weak edge pixels. if T 1 and T 2 The larger the difference, the more weak edges are extracted, and these weak edges are unstable. So we try to make T when setting the canny parameter 1 and T 2 The difference is small (for example: T 2 -T 1 =0.0001, T 1 =0.2999, T 2 =0.3000), in order to obtain a stable edge.

[0066] B. Optimize the extracted edge curve

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Abstract

The present invention provides an anti-geometric attack Robust watermark method based on a stable circle. The method utilizing basic concept of the the second watermark technology, comprehensive considering the image character and watermark information, firstly determines a stable circle based on the CSS angular point detected by the multi-scale curvature product method, then divides sectors in the stable circle which reference point is centroid of the image, embeds in watermark in the time-space area by the QIM method. The invention not only resists the processing attack of the conventional signal, but alos resists geometrical attack such as rotation, zoom, parallel move and cutting, capable of effectively protecting copyright of the digital media.

Description

technical field [0001] The invention belongs to the field of multimedia, and in particular relates to a robust watermarking method against geometric attacks based on a stable circular area. Background technique [0002] With the rapid development of computer and Internet technology, multimedia files are widely disseminated, and the protection of their intellectual property becomes more and more important. Digital watermarking is an effective method, which embeds specific copyright information into the image as a proof of copyright owner. [0003] To play a role in protecting copyright, digital watermark should have two basic characteristics: first, transparency, that is, the image embedded with watermark is almost the same as the original image, the existence of digital watermark cannot be seen, and the original work should not be damaged as much as possible; secondly It is robustness, that is, digital watermarking should be able to resist various intentional or unintention...

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Application Information

Patent Timeline
20 Aug 2008
Publication
CN101246589A
IPC
G06T1/00
Inventors
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