Significant digital watermarking algorithm of hypercomplex number frequency domain

A digital watermarking and super-complex technology, which is applied in computing, image data processing, image data processing, etc., can solve the problem of large watermark capacity

Inactive Publication Date: 2008-08-20
FUDAN UNIV
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  • Abstract
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Problems solved by technology

The advantage of meaningful watermarking is that if the decoded watermark is damaged due to an attack or other reasons, people can still confirm whether there is a watermark through visual observation, but this type of algorithm

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  • Significant digital watermarking algorithm of hypercomplex number frequency domain
  • Significant digital watermarking algorithm of hypercomplex number frequency domain
  • Significant digital watermarking algorithm of hypercomplex number frequency domain

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Embodiment Construction

[0107] Let the color carrier image be f 0 , the watermark graphic wm is of size M m Row×N m Binary graph of columns. Arrange wm into a one-dimensional sequence, then there are M m ×N m data. The specific embodiment of the present invention embedding digital watermark in hypercomplex number frequency domain is as follows:

[0108] 1. First, carry out hypercomplex modeling on the color carrier image, that is, express its RGB (red, green, blue) model of each pixel as a pure hypercomplex form: f 0 (x,y)=R(x,y)i+G(x,y)j+B(x,y)k. Among them, (x, y) is the coordinate of the pixel in the color image, that is, the position of the row and column of the matrix where the pixel is located.

[0109] 2. Divide the color carrier image into 8×8 unit blocks, and perform super-complex Fourier transform for each 8×8 unit block according to the following formula:

[0110] f R (u,v)=i(real(R RFT )+μ·imag(R RFT ))

[0111] +j(real(G RFT )+μ·imag(G RFT ))

[01...

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Abstract

The present invention belongs to image signal processing field, in particular a significative digital watermarking algorithm of the supercomplex frequency domain. The algorithm processing quick supercomplex Fourier transform to the color carrier image, selecting proper frequency band to embed in the watermark data in the supercomplex frequency domain, and repairing the value of coefficient of asymmetry, resolving the problem of the precondition of the supercomplex frequency domain embedding in the watermark, ensuring process transmittion by the red, green, blue of the color image when embedding in the watermark image, paving a road for further study of the color image watermarking algorithm of the supercomplex frequency domain. The algorithm also provides a regulation of ''intersecting redundancy embed'' of the watermark data, further improving the Robust of the digital watermark. The analyzing result shows that the proposed method diffuses the error caused by watermark to the whole imge by supercomplex Fourier transform, and diffuses to each weight of red, green, blue colors, achieving excellent combination of the non intangibity and safety of the digital watermark.

Description

technical field [0001] The invention belongs to the technical field of image signal processing, and in particular relates to a meaningful digital watermark algorithm in the hypercomplex frequency domain. Background technique [0002] With the popularization of the Internet and the rapid development of multimedia technology, the application field of digital watermarking has also expanded to the protection of intellectual property rights of digital works, the identification of authenticity of documents, and the anti-counterfeiting of bills in e-commerce transactions. Digital watermarking technology has become increasingly popular. Focused research hotspots. According to the hidden position of digital watermark, it can be divided into space-time domain watermark or transform domain watermark. In recent years, most of the watermarking literatures focus on transform domains such as DCT, DFT, and JPEG. The invention proposes a new transform domain watermark algorithm, that is, e...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 江淑红张建秋胡波
Owner FUDAN UNIV
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