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Logarithm quantization-based information hiding method, logarithm quantization-based information extraction method and related device

A technology of information hiding and quantity, applied in the field of image processing, can solve problems such as weak robustness, ignoring the characteristics of human visual perception, and affecting the detection performance of watermark data, so as to achieve improved robustness, good imperceptibility, and avoid detection performance-affecting effects

Active Publication Date: 2018-05-01
SHANGRAO NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Taking the information hiding technology based on logarithmic index modulation as an example, in related technologies, the information hiding technology based on logarithmic index modulation is less robust to attacks such as amplitude scaling and rotation, and ignores the human eye. Visual perception characteristics directly affect the detection performance of watermark data, which in turn limits the further expansion of the method

Method used

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  • Logarithm quantization-based information hiding method, logarithm quantization-based information extraction method and related device
  • Logarithm quantization-based information hiding method, logarithm quantization-based information extraction method and related device
  • Logarithm quantization-based information hiding method, logarithm quantization-based information extraction method and related device

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no. 1 example

[0034] Please refer to figure 2 , figure 2 The flow chart of the steps of the information hiding method based on logarithmic quantization provided by the preferred embodiment of the present invention. The method comprises the steps of:

[0035] Step S101, from the plurality of image sub-blocks corresponding to the original image, filter out a predetermined number of target image sub-blocks according to predetermined rules.

[0036] The above-mentioned original image may be image information that needs to add watermark data. 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 64×64.

[0037] Then according to the pixel value of each image sub-block and the size of the image sub-block, use the formula:

[0038]

[0039] The energy...

no. 2 example

[0105] Please refer to Figure 5 , Figure 5 The flow chart of the steps of the information extraction method based on logarithmic quantification provided by the preferred embodiment of the present invention. The method is used to extract watermark data in the watermark image obtained by using the information hiding method based on logarithmic quantization provided in the first embodiment. Such as Figure 5 As shown, the method includes the following steps:

[0106] Step S201, when it is detected that the watermark image is distorted, from the multiple image sub-blocks corresponding to the watermark image, filter out the predetermined number of the extracted image sub-blocks according to a predetermined rule.

[0107] In the embodiment of the present invention, when the electronic device 100 as the receiving end of the watermarked image detects that the watermarked image will be distorted after being attacked by the channel, from the multiple image sub-blocks corresponding ...

no. 3 example

[0121] Please refer to Image 6 , Image 6 The information hiding apparatus 200 based on logarithmic quantization provided by the embodiment of the present invention is shown. Such as Image 6 As shown, the information hiding device 200 based on logarithmic quantization includes: a screening module 201 , a processing module 202 , a calculation module 203 and an embedding module 204 .

[0122] The filtering module 201 is configured to filter out a predetermined number of target image sub-blocks according to predetermined rules from the plurality of image sub-blocks corresponding to the original image.

[0123] The processing module 202 is configured to respectively perform wavelet transformation processing on each of the target image sub-blocks, so as to obtain a corresponding first low-frequency sub-band image wavelet coefficient vector and a low-frequency sub-band image.

[0124] The processing module 202 is further configured to perform logarithmic transformation processi...

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Abstract

The invention provides a logarithm quantization-based information hiding method, a logarithm quantization-based information extraction method and a related device. The logarithm quantization-based information hiding method comprises the following steps of: screening a predetermined quantity of target image sub-blocks from a plurality of image sub-blocks corresponding to an original image accordingto a predetermined rule; respectively carrying out wavelet transformation on each target image sub-block and carrying out logarithm transformation on an obtained first low-frequency sub-band waveletcoefficient vector so as to obtain a corresponding logarithm domain wavelet coefficient vector; obtaining a corresponding quantization step length by utilizing a vision model according to each low-frequency sub-band image; and embedding to-be-embedded watermark data into the original image according to the quantization step length and the logarithm domain wavelet coefficient vector. Through the logarithm quantization-based information hiding method, the robustness, for attacks such as range scale zooming, rotation and the lie, of the embedded watermark data is improved, the embedded watermarkdata has favorable imperceptibility, and detection performance of the watermark data is prevented from being influenced.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular, to an information hiding method based on logarithmic quantization, an 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 information hiding technology based on logarithmic index modulation as an example, in related technologies, the informati...

Claims

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Application Information

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IPC IPC(8): G06T1/00
CPCG06T1/005G06T2201/0065
Inventor 刘金华李永明徐牡莲徐信叶吴连发
Owner SHANGRAO NORMAL UNIV
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