variable step size color image blind watermarking method based on matrix Schur decomposition

A color image and blind watermarking technology, applied in the field of information security, can solve the problem that the key space is difficult to meet the application requirements of high security

Active Publication Date: 2019-05-31
LUDONG UNIVERSITY
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Problems solved by technology

For this reason, on the one hand, the signs that require copyright protection tend to be beautiful and practical, large-capacity color image digital watermarks, and are no longer limited to small-capacity pseudo-random sequences, binary images, or grayscale images; on the other hand, with the With

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  • variable step size color image blind watermarking method based on matrix Schur decomposition
  • variable step size color image blind watermarking method based on matrix Schur decomposition
  • variable step size color image blind watermarking method based on matrix Schur decomposition

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[0040] The purpose of the present invention is to provide a variable-step color image blind watermarking method based on matrix Schur decomposition, including the embedding process and extraction process of the color image digital watermark, and the specific process of its watermark embedding is described as follows:

[0041] Step1: Preprocessing of the color host image: convert a 24-bit color host image with a size of 512×512 H Perform dimensionality reduction processing to obtain red, green, and blue three-layer color channels H p , and divide the pixels in each color channel into 3×3 non-overlapping pixel blocks, p =1,2,3, respectively represent the red, green, and blue three-layer color channels;

[0042] Step2: Preprocessing of color watermark images: 24-bit color watermark images with a size of 32×32 W Perform dimensionality reduction processing to obtain red, green, and blue three-layer color channels, and then perform each layer of color channels based on the privat...

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Abstract

The invention discloses a variable step size color image blind watermarking method based on matrix Schur decomposition in combination with the advantage of high robustness of a frequency domain digital watermarking algorithm. According to the invention, the complexity of Schur decomposition in a frequency domain is lower than that of other matrix decomposition methods; and Schur decomposition is carried out on the image blocks to obtain an upper triangular matrix, main diagonal elements of the upper triangular matrix are the characteristic values of the image blocks, and according to the method, the sum of the characteristic values is quantized to complete embedding and blind extraction of the color digital watermarks. According to the invention, the color image digital watermark can be embedded into the color host image; The method has the advantages of being high in robustness, high in safety and large in capacity, has the advantages of being good in watermark concealment, solves theproblem that a large-capacity color image digital watermark is low in safety, and is suitable for the occasion of high-safety large-capacity digital media copyright protection.

Description

technical field [0001] The invention belongs to the technical field of information security and relates to the copyright protection of color image digital watermarks with strong robustness, high security and large capacity. Background technique [0002] With the rapid development of multimedia technology, more and more color digital images emerge and spread on the Internet and become one of the main media of modern information. Illegal acts such as piracy and infringement are not uncommon. The copyright of color digital images The issue of protection has also received widespread attention from scholars at home and abroad. For this reason, on the one hand, the signs that require copyright protection tend to be beautiful and practical, large-capacity color image digital watermarks, and are no longer limited to small-capacity pseudo-random sequences, binary images, or grayscale images; on the other hand, with the With the in-depth study of computer technology, hackers are incr...

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Application Information

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IPC IPC(8): G06T1/00
Inventor 苏庆堂刘得成袁子涵王刚王环英邓冠龙
Owner LUDONG UNIVERSITY
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