Image watermarking method and system based on significance detection and contourlet transformation

A technology of contourlet transformation and image watermarking, which is applied in the fields of information hiding and image processing

Active Publication Date: 2019-05-14
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A series of watermarking algorithms that are robust to amplitude scaling attacks have been proposed, but there are still deficiencies

Method used

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  • Image watermarking method and system based on significance detection and contourlet transformation
  • Image watermarking method and system based on significance detection and contourlet transformation
  • Image watermarking method and system based on significance detection and contourlet transformation

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Embodiment 1

[0055] Such as figure 1 As shown, the present invention proposes an image watermarking system based on saliency detection and contourlet transformation, including a watermark embedding module, an information transmission module, and a watermark extraction module:

[0056] The watermark embedding module is configured to perform the following actions: perform saliency detection on the carrier image to obtain a corresponding saliency map, and divide it into non-overlapping small blocks; then perform contourlet transformation on the carrier image to obtain a carrier image The low-pass subband of the image is divided into non-overlapping small blocks, and the number of blocks is the same as that of the saliency map; the quantization step size of each block is determined by the mean value of the saliency value and the energy distribution in the block , and use the quantization-based watermark embedding algorithm to embed the watermark bits into the maximum singular value of the low-...

Embodiment 2

[0060] Such as figure 2 As shown, the present invention also proposes an image watermarking method based on saliency detection and contourlet transformation, and the specific steps are as follows:

[0061] 1) Watermark embedding:

[0062] 1.1) Use the two-way information transfer model to carry out saliency detection on the carrier image, obtain the corresponding saliency map, divide it into M small blocks with a size of B×B that do not overlap each other, and calculate the mean value of the saliency value of each image block

[0063] 1.2) Using 3-layer non-subsampling contourlet transform, the adopted Laplacian pyramid filter structure and directional filter bank are both "pkva" filters, and the carrier image is subjected to contourlet transform to obtain the low-pass subband I J , divide it into M small blocks with a size of B'×B' that do not overlap each other, denoted as L 1 , L 2 ,...,L M , calculate the energy E of each image block;

[0064] 1.3) In each image bl...

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Abstract

The invention discloses an image watermarking method based on significance detection and contourlet transformation. Saliency detection and contourlet transformation are carried out on the carrier image, the transformed low-pass sub-bands are partitioned, the quantization step length of each block is determined according to the significance value and the energy distribution in the block, and watermark information is adaptively embedded into the contourlet domain of the carrier image. The invention further provides an image watermarking system based on significance detection and contourlet transformation. The image watermarking system comprises a watermark embedding module, an information transmission module and a watermark extraction module. According to the invention, watermark informationis adaptively embedded into each block of a carrier image low-pass sub-band at a sending end through an improved logarithmic index modulation algorithm; and the quantization step length of each blockis used as a secret key to be sent to a receiving end, watermark extraction is achieved, the method has the advantages of being good in concealment, high in non-perceptibility and the like, and highrobustness is shown when noise, filtering, image compression, amplitude scaling and other conventional watermark attacks are resisted.

Description

technical field [0001] The invention relates to an image watermarking method and system, belonging to the technical fields of information hiding and image processing. Background technique [0002] Digital watermarking adds certain digital information to digital media information in order to protect the copyright of digital media. Generally speaking, digital watermarking has three main characteristics: invisibility, robustness and capacity. The quantization index modulation algorithm has become one of the most popular robust watermarking algorithms because it can effectively compromise these three characteristics; the quantization index modulation is improved, and the logarithmic transformation is applied to the quantization watermarking algorithm, which improves the robustness of the algorithm, but both are extremely vulnerable to amplitude scaling attacks. A series of watermarking algorithms robust to amplitude scaling attacks have been proposed, but there are still defic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 张毅锋孙一博
Owner SOUTHEAST UNIV
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