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

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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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 the in-depth study of computer technology by hackers, their ability to attack algorithms is becoming stronger and stronger, and the small key space of the algorithm is difficult to meet the application requirements of high security, so it is necessary to further improve the security of the algorithm

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