Digital watermark implanting and extracting method based on parth search

A technology of digital watermarking and extraction method, applied in color TV parts, TV system parts, TV and other directions, can solve the problems of weak anti-noise ability, loss of watermark information, and poor compression standard ability, etc. To achieve the effect of simple and easy to understand, simple and easy to implement, and good resistance

Inactive Publication Date: 2004-11-24
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the algorithm's hiding ability is relatively low
[0011] Jui-Cheng Yen described a watermark algorithm and its specific implementation steps in "Watermarks embedded in permuted domain." (Electronics Letters, Volume: 37, pp.80-81, 2001), but it has many limitations
First of all, its image scrambling method is not very good. After its scrambling method, the watermark information is not scattered throughout the image, but most of it is still concentrated in the upper left corner of the image. Therefore, if this part is cut, Then most of the watermark information will be lost, and the watermark information cannot be presented
Furthermore, its ability to resist the JPEG (Joint Photographic Experts Group) compression standard is not very good. At 40% compression rate, the extracted watermark information is basically unconfirmable.
Finally, its anti-noise ability is not strong, after a small amount of noise is added to the image, the watermark information cannot be recognized

Method used

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  • Digital watermark implanting and extracting method based on parth search
  • Digital watermark implanting and extracting method based on parth search

Examples

Experimental program
Comparison scheme
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Embodiment

[0037] Suppose the original image is the standard "Lena" (Fig. 2.a), with a size of 512×512 and a watermark of 64×64 binary Chinese character “Tong” (Fig. 2.b).

[0038] First, the image is globally scrambled, using the following Logistic mapping:

[0039] x n+1 =μx n (1-x n ), 0n <1

[0040] When μ=3.9, and properly select the initial value x 0 =0.8(key), the generated sequence x n Has chaotic properties. Discard the first 9 values, starting from the 10th value, expand each value in binary, take the first 36 bits, and form an integer every 9 bits, thus forming 4 integers, and exchange the rows corresponding to the first two integers , the columns corresponding to the last two integers are exchanged, and this is repeated 1000 times. Turn the two-dimensional watermark image into a bit stream b(i). Then divide the image into 16×16 pixel blocks, set the center point of each block as the upper left corner and move 7 pixels to the right and down, denoted as (p j ,q j ) us...

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PUM

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Abstract

A method for embedding and extracting the digital water mark on the basis of route searching embeds the bits of the information of the digital water after disturbing the original image of the carrier according to the Chaos projection. When embedding the digital water mark, the method divides the disturbed original image into blocks, finds the gray level of the pixels of the reference point of each block after modifying the special orientation according to the bits of the water mark, making the relationship of the gray level between the pixels meet the predefined distance criterion and inverse-converts the disturbed image to obtain the image in which the water mark is embedded. When extracting the water mark, using the same disturbing and dividing manners as embedding, the method searches the route which meets the criterion

Description

Technical field: [0001] The invention relates to a digital watermark embedding and extraction method based on path search, which is a digital watermark method suitable for copyright authentication of digital image products and preventing illegal copying. Background technique: [0002] Digital watermarking technology is to embed some iconic information directly into multimedia content through a certain algorithm, but it does not affect the value and use of the original content, and it cannot be perceived or noticed by the human perception system. Watermark information can be the author's serial number, company logo, text with special meaning, etc., which can be used to identify the source, version, original author, owner, publisher, and legal user of a file, image, or music product. right. Unlike encryption technology, digital watermarking technology cannot prevent piracy, but it can determine whether the object is protected, monitor the dissemination of protected data, iden...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/76H04N5/913
Inventor 何晨冯国瑞蒋铃鸽王东建
Owner SHANGHAI JIAO TONG UNIV
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