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Self-adapting watermarking algorithm of colorful image hypercomplex number spacing

A color image and hypercomplex technology, applied in image data processing, image data processing, computing, etc.

Inactive Publication Date: 2008-08-20
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the current watermark embedding algorithms are for grayscale images, and there are few watermark algorithms directly used on color carrier images

Method used

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  • Self-adapting watermarking algorithm of colorful image hypercomplex number spacing

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Embodiment Construction

[0086] 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:

[0087] 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.

[0088] 2. Use the pseudo-random number generator controlled by the key Key to pseudo-randomly select M m ×N m An integer (value range is 1-14), as the embedding position of the digital watermark. According to the blocking rules of the carrier image in the author's literature [8], the carrier ...

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Abstract

The present invention belongs to the image signal processing field, in particular a self-adapting watermark algorithm of a color image supercomplex frequency domain. Fistly, the algorithm processes a quick supercomplex Fourier transform to color carrier image, selecting proper frequency band in the supercomplex frequency spectrum real component, masking the vein, edge and brightness of the color carrier image by the human visual system, bestowing different masking intensities to the selecting frequency bands to embed watermark, achieving a self-adapting watermark algorithm of a color image supercomplex space. The result shows that the self-adapting masking of the color image greatly improve non intangibity and safety of the supercomplex frequency domain watermark algorithm, and having better aggressivity than the supercomplex frequency domain watermark algorithm having non-self-adapting mask; contrast to the present documents, the advantages of the invention are verified.

Description

technical field [0001] The invention belongs to the technical field of image signal processing, and in particular relates to an adaptive watermarking algorithm of a color image hypercomplex number space. Background technique [0002] With the popularization of the Internet and the rapid development of multimedia technology, the application field of digital watermarking has 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. research hotspots. In recent years, the adaptive watermarking algorithm based on the visual model of the carrier image has been paid more and more attention. Research demonstrates the use of vision models to determine image-dependent modulation masks [1] , such as the masking characteristics of image texture, edge and brightness, and then use them to in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 江淑红张建秋胡波
Owner FUDAN UNIV
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