Blind Watermarking Method for Color Digital Image Based on Pure Quaternion Schur Decomposition

Abstract

The invention utilizes the advantage of strong robustness of frequency-domain digital watermark algorithm to disclose a color digital image blind watermark method based on pure quaternion Schur decomposition. According to the correlation of the coefficients of the unitary matrix obtained after the Schur decomposition of the image represented by the quaternion, the invention completes the embedding and blind extraction of the color digital watermark by modifying two coefficients with higher correlation in the unitary matrix. The invention embeds the color digital watermark image into the color host image, which not only has strong robustness, but also has better watermark concealment and higher security, and solves the problem of poor robustness of the large-capacity color image digital watermark algorithm And low security problems, suitable for strong robustness, high security, large-capacity digital media copyright protection occasions.

Description

technical field [0001] The invention belongs to the technical field of information security, and relates to fast copyright protection of large-capacity color digital images with strong robustness and high security. Background technique [0002] With the rapid development of network technology, more and more digital works are published on the network, such as color digital images, once uploaded to the network, the scope of its transmission will be difficult to determine; , Once a digital work is found to be suspected of plagiarism, its responsibility is difficult to pursue. Therefore, the copyright protection of digital works has attracted extensive attention of scholars at home and abroad. However, the existing digital watermarking algorithms used in digital copyright protection have certain limitations: on the one hand, with the in-depth research of computer technology by hackers, their ability to attack algorithms is increasing, and algorithms with smaller key spaces are ...

AI Technical Summary

Problems solved by technology

However, the existing digital watermarking algorithms used in digital copyright protection have certain limitations: on the one hand, with the in-depth research of computer technology by hackers, their ability to attack algorithms is increasing, and algorithms with smaller key spaces are easily exploited. Therefore, it is difficult to meet the application requirements of high security, and the security of the digital watermarking algorithm needs to be further improved; Pseudo-random sequences with small capacity, binary images or grayscale images

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