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Multiplicative watermark embedding method, extraction method and related device

A wavelet coefficient and target image technology, applied in the field of image processing, can solve the problems of complex mathematical model calculation, high cost, and difficult extraction of watermark information, and achieve the effect of reducing cost and easy extraction

Active Publication Date: 2021-06-22
SHANGRAO NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, although the multiplicative embedding strength of the watermark is well controlled, the calculation of the mathematical model for multi-objective optimization is complicated and the cost is high
At the same time, since the watermark embedding uses the information entropy of the image to select the image sub-block with larger entropy to embed the watermark information, but after embedding the watermark information, the entropy value of the image sub-block is easy to change, making it difficult to extract the watermark information correctly

Method used

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  • Multiplicative watermark embedding method, extraction method and related device
  • Multiplicative watermark embedding method, extraction method and related device
  • Multiplicative watermark embedding method, extraction method and related device

Examples

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no. 1 example

[0030] Please refer to figure 2 , figure 2 The flow chart of the steps of the multiplicative watermark embedding method provided by the preferred embodiment of the present invention. Such as figure 2 As shown, the method includes the following steps:

[0031] Step S101, divide the original image into multiple image sub-blocks.

[0032] The aforementioned original image may be image information that needs to be added with watermark information. In the embodiment of the present invention, the original image is divided into multiple image sub-blocks of the same size and not overlapping each other. For example, if the image size of the original image is 512×512, it is divided into multiple non-overlapping image sub-blocks with a size of 32×32.

[0033] Step S102, according to the pixel value of each image sub-block, the energy value corresponding to the image sub-block is obtained.

[0034] In the embodiment of the present invention, according to the pixel value of each i...

no. 2 example

[0076] Please refer to Figure 4 , Figure 4 The flow chart of the steps of the multiplicative watermark extraction method provided by the preferred embodiment of the present invention. The method is used to extract watermark information in the watermark image obtained by using the multiplicative watermark embedding method provided in the first embodiment. Such as Figure 4 As shown, the method includes the following steps:

[0077] In step S201, the watermark image is processed using a Laplace distribution model to obtain an image watermark distribution function.

[0078] In this embodiment, the detection of the watermark information of the watermarked image can be regarded as a signal detection and estimation problem, and the likelihood ratio (LR, likelihood Ratio) is used for statistical testing, and the hypothesis testing formula can be obtained:

[0079]

[0080] where H 0 is the null hypothesis, H 1 for the alternative hypothesis. Then use the Laplace distribut...

no. 3 example

[0092] Please refer to Figure 5 , Figure 5 A multiplicative watermark embedding device 200 provided by an embodiment of the present invention is shown. Such as Figure 5 As shown, the multiplicative watermark embedding device 200 includes: a division module 201 , an acquisition module 202 , a screening module 203 , a calculation module 204 , a generation module 205 and an embedding module 206 .

[0093] The division module 201 is configured to divide the original image into multiple image sub-blocks.

[0094] In the embodiment of the present invention, step S101 may be executed by the division module 201 .

[0095] The obtaining module 202 is configured to obtain the energy value corresponding to the image sub-block according to the pixel value of each image sub-block.

[0096] In the embodiment of the present invention, step S102 may be executed by the obtaining module 202 .

[0097] The screening module 203 is configured to screen out a predetermined number of target ...

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Abstract

The invention provides a multiplicative watermark embedding method, extraction method and related devices. The target image sub-block is selected according to the energy value corresponding to the image sub-block, and then the adaptive embedding strength factor is generated according to the obtained high-frequency sub-band wavelet coefficient energy and saliency distance, and the obtained adaptive embedding strength factor is combined with human vision. The texture masking effect and visual saliency characteristics of the perceptual model, so as to calculate the embedding corresponding to each target image sub-block according to the wavelet coefficient vector of the first low-frequency sub-band image, the adaptive embedding strength factor and the watermark information to be embedded A vector of wavelet coefficients of the second low-frequency sub-band image. Finally, according to the wavelet coefficient vector of the second low-frequency sub-band image, the watermark information to be embedded is embedded into the original image to obtain a watermark image. Through this solution, the cost of watermark information embedding is reduced, and the simplicity and accuracy of subsequent watermark information extraction can also be improved, which is suitable for popularization and use.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a multiplicative watermark embedding method, extraction method and related devices. Background technique [0002] Watermark is a digital information mark added to data multimedia (such as image, sound, video signal, etc.) to achieve the functions of document authenticity identification and copyright protection. The embedded watermark information is hidden in the host file without affecting the observability and integrity of the original file. The ideal watermark information embedding should have the advantages of simple embedding process, low cost of use, and convenient extraction. [0003] Although various watermark embedding methods have been proposed in related technologies, there are still many problems. Taking the multiplicative watermark embedding method as an example, in related technologies, the multiplicative watermark embedding method needs to use a m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
CPCG06T1/0021G06T2201/0061
Inventor 刘金华李永明徐信叶徐牡莲吴连发
Owner SHANGRAO NORMAL UNIV