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Image watermark method based on finite ridgelet transform

A ridgelet transform and image watermarking technology, applied in the field of information security

Inactive Publication Date: 2008-04-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Wavelet analysis of linear singularities is not a good representation tool

Method used

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  • Image watermark method based on finite ridgelet transform
  • Image watermark method based on finite ridgelet transform
  • Image watermark method based on finite ridgelet transform

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Experimental program
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Embodiment Construction

[0071] Adopt the method of the present invention, use Matlab or C language to realize the program of watermark embedding and watermark detection. In the experiment, a 256 grayscale image with a size of 256×256 is used as the test image, the block size p=17, and the one-dimensional discrete wavelet is Daubechies-4 wavelet, and the embedding parameter is α k =1, a=10, b=2. The detection threshold was set at 0.035. Randomly generate 100 watermarks, and embed them in the original image 100 times to get 100 watermarked images embedded with different watermarks. Perform routine processing on these images, and count their missed detection probability for watermark detection, as shown in the following table:

[0072] Image processing performed

[0073] To sum up, the watermarking algorithm provided by the present invention makes full use of the characteristics of the finite ridgelet transform, the method is novel, and it has good robustness and has certain practical value....

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Abstract

The invention relates to an image watermark method based on limited ridge wave transformation, wherein said method comprises: dividing the image into p blocks, and generating one watermark sequence w={wi|wi<;{-1,1}, 0<=i<=L-1}, at the length as L=p-1; processing limited ridge transformation on each block; searching for the direction with maximum energy in the ridge field, embedding watermark into said direction; the formula, when embedding watermark, is relative to the eye sensitivity with the different direction changes, while the embedded strength of watermark at different directions are different; embedding same watermark into each image block, top realize localization on watermark. The invention has high separate degree, and robustness on general image processing, while it can resist image shear impact.

Description

technical field [0001] An image watermarking method based on finite ridgelet transform belongs to the technical field of information security, and in particular relates to finite ridgelet transform theory and image digital watermarking technology. Background technique [0002] The rapid development of digital technology and network technology has changed people's life in many ways. The exchange of multimedia information based on computer and network provides a convenient way for the use and dissemination of digital works, which makes digital works have great advantages compared with traditional works. However, the advent of the network information age also poses new challenges to copyright protection, and the traditional information encryption technology can no longer meet the needs of practical applications. Digital watermarking technology is an emerging interdisciplinary application technology, which absorbs ideas and theories from many disciplines. Simply put, digital w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 马争张金沙
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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