Image digital watermark embedding method and image digital watermark detecting method

A watermark embedding and watermark detection technology, applied in image data processing, image data processing, instruments, etc., can solve problems such as poor robustness against attacks and small watermark information capacity, and achieve low false detection rate, high detection rate, and process little effect

Inactive Publication Date: 2012-07-25
北京中盈信安科技发展有限责任公司
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Problems solved by technology

However, the common digital image watermarking technology in the prior art has poor robustness against attacks ...

Method used

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  • Image digital watermark embedding method and image digital watermark detecting method
  • Image digital watermark embedding method and image digital watermark detecting method
  • Image digital watermark embedding method and image digital watermark detecting method

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Embodiment Construction

[0030] In order to be able to resist the commonly used attack methods of pirates, such as rotation, cropping, scaling, etc., and to maintain a good visual effect of the image embedded with the watermark, and to achieve blind extraction when the watermark is detected, the present invention provides a binary image digital A method for embedding a watermark and a method for extracting a digital watermark in a binary image, wherein the specific flow of the method for embedding the watermark is as follows, see figure 1 :

[0031] Step 101: Acquire source image S1;

[0032] Step 102: Taking one point of the source image S1 or its subset as the center to form multiple concentric circles, thereby dividing the source image into a central circle block and a plurality of ring blocks, according to the color component values ​​of each pixel in the center circle and the ring bands Store in the matrix to obtain the first digital sequence S2;

[0033] Step 103: The central block and the rin...

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Abstract

The invention provides an image digital watermark embedding method and an image digital watermark detecting method. The watermark embedding method comprises the following steps of: dividing a source image into a center circular block and a plurality of ring belt blocks, and transforming each set of data by a transform domain watermark algorithm and embedding the image digital watermark into the source image; and the watermark detecting method comprises the following steps of: carrying out a blocking step which is as the same as the embedding process on an image to be detected, transforming by the same transform domain watermark algorithm, and extracting and comparing the watermark. After the watermark embedding method and detecting method of the invention are adopted, the technical problem that the common image digital watermark is bad in attack robust performance resistance and small in watermark information capability in the prior art can be solved, the rotation with any angles can be resisted, the zooming with larger times can be resisted, the geometrical transformation attack with larger edge cutting can be resisted, and the methods are easily combined with the other digital watermark technologies, so that the non-geometric transformation attack such as the channel noise, the filtering and the lossy compression can be resisted.

Description

technical field [0001] The invention relates to the technical field of image digital watermark; more specifically, it relates to an image digital watermark embedding method and a detection method thereof. Background technique [0002] In the field of digital watermarking technology, geometric transformation processing such as rotation, cropping, and scaling are the most commonly used attack methods by digital image copyright pirates. The direct consequence of these attack methods is to destroy the synchronization between the digital watermark detector and the digital watermark, so that The detector cannot detect the digital watermark signal in the image. Along with geometric transformation attacks, copyright pirates may also implement attacks such as channel noise, filtering, and lossy compression. When a digital image undergoes geometric transformation, a large number of interpolation operations are required. While the position information of the original digital image inf...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 余伟华刘泽吴龙为
Owner 北京中盈信安科技发展有限责任公司
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