Color image watermarking method based on quaternion index matrix

Abstract

The invention discloses a color image watermarking method based on a quaternion index matrix. The color image watermarking method can effectively resist the desynchronizing attack. The method comprises the following steps of calculating the quaternion index matrix of an original color image, reconstructing the original color image according to the quaternion index matrix, selecting a stable low-order quaternion index matrix, adopting a quantization modulation strategy to embed watermarking information into a quaternion index matrix amplitude, reconstructing the color image into which the watermarking information is embedded according to the selected quaternion index matrix and carrying out the margin calculation on the reconstructed image to superpose the obtained differential value into the original image.

Description

technical field [0001] The invention relates to the fields of digital multimedia anti-counterfeiting and information security protection, in particular to a color image watermarking method based on quaternion exponent moments that can effectively resist desynchronization attacks. Background technique [0002] With the rapid development of network technology and digital media technology, the transmission and utilization of digital information has become increasingly frequent and widespread. Since digital information is easily edited, copied and distributed without restriction, the encryption of digital works has become increasingly prominent. . Digital watermarking (Digital Watermarking), as an effective supplementary method to traditional encryption methods, is a new technology that can protect copyright and authenticate the source and integrity in an open network environment. A hot spot of research. The so-called digital image watermark is to hide a mark (watermark) with ...

AI Technical Summary

Problems solved by technology

Among them, the exhaustive search scheme has the disadvantages of large amount of calculation and high false alarm rate; the scheme of combining spread spectrum watermark with spreading code cannot realize the blind detection of watermark information; More complex general desynchronization attacks such as ratio conversion and local affine distortion; the synchronous correction scheme has weaknesses such as limited watermark capacity and high time complexity; The stability of feature points is poor and the distribution is extremely uneven, the color image feature point detection operator is scarce, the constructed local feature area does not have complete affine invariance, and the capacity of digital watermark is too small, etc.

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