Asymmetric watermark algorithm based on Logistic chaotic mapping and Walsh sequence

A chaotic mapping and asymmetric technology, applied in computing, program/content distribution protection, image data processing, etc., can solve problems such as not being able to protect copyright well

Inactive Publication Date: 2014-09-24
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

However, digital watermarking technology generally uses symmetric watermarking. For traditional symmetric digital watermarking technology, the same key is used for watermark embedding and watermark detection. Watermark detection can only be comp

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  • Asymmetric watermark algorithm based on Logistic chaotic mapping and Walsh sequence
  • Asymmetric watermark algorithm based on Logistic chaotic mapping and Walsh sequence
  • Asymmetric watermark algorithm based on Logistic chaotic mapping and Walsh sequence

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Embodiment Construction

[0045] The asymmetric watermarking algorithm based on the Logistic chaotic map and the Walsh sequence involved in the present invention will be further described below in conjunction with the accompanying drawings.

[0046]

[0047] figure 1 It is the carrier image of the technical solution of the present invention in the embodiment.

[0048] In this embodiment, under the environment of matlab2013a, as figure 1 The grayscale image of 512×512 shown is the carrier image (ie m=512). Take the branch parameter μ of the one-dimensional Logistic chaotic sequence 0 =3.711, initial value x 0 = 0.773. public key W p The Walsh sequence formed by the 112th row of the 4096×4096 Hadamard matrix is ​​selected. Embed watermark W w , parameters α=0.73, β=0.64, λ=17.

[0049] figure 2 The watermark embedding flowchart in the embodiment is the technical solution of the present invention.

[0050] image 3 It is a flow chart of watermark detection in the embodiments of the technical s...

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Abstract

The invention provides an asymmetric watermark algorithm based on Logistic chaotic mapping and a Walsh sequence. The algorithm comprises the following steps: a characteristic matrix is obtained according to the largest singular value of each coefficient block of a carrier image; a Walsh sequence which is not related to the characteristic matrix is selected to be a public key watermark, a chaotic sequence is obtained according to the Logistic mapping kinetic equation, and the chaotic sequence is converted into a sequence of which the value is +/-1 and a sequence which is not related to the characteristic matrix is cut out from the sequence as a private key watermark; an embed watermark is obtained according to the weighted sum of the public key watermark and the private key watermark, and a watermark image is generated according to the information of the embed watermark; and the watermark image is detected. The technical scheme of the invention has the advantage of high safety, the copyright can be well protected, and advantages of good performance and good robustness can be realized.

Description

technical field [0001] The invention belongs to the technical field of digital watermarking, in particular to an asymmetrical watermarking algorithm based on Logistic chaotic mapping and Walsh sequence. Background technique [0002] With the widespread popularization of digital products and the rapid development of network technology, people pay more and more attention to the security of digital products. How to effectively protect the copyright of products has become an issue of great concern to people. [0003] Digital watermarking technology can protect the copyright of digital products very well. However, digital watermarking technology generally uses symmetric watermarking. For traditional symmetric digital watermarking technology, the same key is used for watermark embedding and watermark detection. Watermark detection can only be completed by copyright owners and authorized institutions. The owner needs to show the private key to prove its legal possession. And onc...

Claims

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Application Information

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IPC IPC(8): G06T1/00G06F21/16
Inventor 吴胜兵霍瑶马艳玲李兴林
Owner UNIV OF SHANGHAI FOR SCI & TECH
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