Color image watermarking method based on local histogram characteristics

Abstract

The invention discloses a color image watermarking method based on local histogram characteristics. The method comprises the following steps that a color invariant model of a color image is established by utilizing the chromatic characteristics and the geometric construction characteristics of the color image; an image characteristic point detector based on color invariants and probability density is structured, and stable and even characteristic points are extracted from an original color image; an oval local characteristic area is structured by utilizing characteristic values and characteristic vectors of a probability density second order autocorrelation matrix, the extracted characteristic points and the screened-out oval local characteristic area are mapped back to the original color image, and a color affine invariant local characteristic area is extracted; a high-order flat image histogram of the color affine invariant local characteristic area is extracted, and watermarking information is embedded by carrying out histogram adjustment on RGB components of an extracted high-order flat image respectively.

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 local histogram features 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 a s...

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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