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DCT domain-based color image digital watermark embedding method and DCT domain-based color image digital watermark extracting method

A color image and digital watermarking technology, applied in image data processing, image data processing, instruments, etc., can solve the problems of poor confidentiality and less information, and achieve a balance of robustness and imperceptibility, good robustness, Strong realistic effect

Inactive Publication Date: 2010-06-16
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the watermark embedding technology adopts one-dimensional ID sequence and two-dimensional binary digital watermarking technology. The intellectual property information contained in these two watermarks is small and the confidentiality is poor. Color image digital watermarking can make up for these deficiencies.

Method used

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  • DCT domain-based color image digital watermark embedding method and DCT domain-based color image digital watermark extracting method
  • DCT domain-based color image digital watermark embedding method and DCT domain-based color image digital watermark extracting method
  • DCT domain-based color image digital watermark embedding method and DCT domain-based color image digital watermark extracting method

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Embodiment Construction

[0034] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0035] The embedding method of color image digital watermark provided by the present invention uses Logistic mapping to scramble the coordinates of its R, G, and B components before embedding the color watermark image, and embeds each component of the scrambled color watermark image as a watermark sequence To the host image, the image blocks of the host image are classified according to the brightness, contrast and texture complexity. Using the visual characteristics of the human eye, watermark components of different intensities can be embedded into DCT coefficients of image blocks of different classifications.

[0036] Based on above-mentioned principle, the embedding method of the color image digital watermark based on DCT domain that the pres...

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Abstract

The invention discloses a DCT domain-based color image digital watermark embedding method and a DCT domain-based color image digital watermark extracting method. The DCT domain-based color image digital watermark embedding method comprises the following steps: before embedding a color watermark image, utilizing Logistic mapping to scramble the coordinates of components R, G and B of the color watermark image; embedding each component of the scrambled color watermark image as watermark sequences to a host image; and according to luminance, contrast and texture complexity, classifying image blocks of the host image. By utilizing human visual characteristics, the watermark components of different strengths can be embedded into image block DCT coefficients of different classes. The watermark image produced by the method has the characteristics of good perception effect and strong robustness and has good resistance to some conventional attacks.

Description

Technical field: [0001] The invention relates to digital watermark technology, in particular to a method for embedding a color watermark image into an original color image and a corresponding watermark extraction method. Background technique: [0002] With the rapid development of Internet and multimedia technology, the problem of digital media piracy has become very serious. As a supplementary method to traditional encryption methods, digital watermarking can effectively protect the copyright of digital products. Digital watermarks are divided into visible watermarks and invisible watermarks. For invisible watermarks, imperceptibility and robustness are two important properties. Imperceptibility refers to a series of hidden processing, so that the target data has no obvious degradation phenomenon, but the hidden data cannot be perceived by people. Robustness refers to the ability not to lose hidden information due to certain changes in image files. Imperceptibility and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 杜奕张挺
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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