Color image blind-watermarking method based on ternary coding

Abstract

The invention discloses a color image blind-watermarking method. A color image for copyright protection is subjected to ternary coding and serves as a digital watermark to be embedded into a color parasite image. The embedded color image watermark has good invisibility and meets the requirement for copyright protection based on color image identification. According to the method, each 4*4 pixel block is subjected to QR decomposition, and the watermark is embedded by modifying the value of the element in the first column and the second row and the value of the element in the first column and the third row in an orthogonal matrix Q of the image; after the image containing the watermark is attacked, the embedded watermark is extracted according to the relation between the modified elements in the orthogonal matrix Q of the image, and the purpose of blind detection is achieved. The color image blind-watermarking method has good watermarking algorithm performance and is suitable for copyright protection with the color digital image as the digital watermark.

Description

technical field [0001] The invention belongs to the technical field of information security, and relates to the copyright protection of large-capacity color digital images as digital watermarks. Background technique [0002] With the improvement of people's awareness of copyright protection, the signs used for copyright protection are changing from traditional pseudo-random sequences, binary images, and grayscale images to meaningful color images; however, most of the watermarking methods that have been proposed so far are aimed at For grayscale images, the research on digital watermarking methods for color images is less, mainly because grayscale images are easier to process than color images, and grayscale images only contain luminance information without chrominance information, embedding watermarks in them will not Generate new color components; and when embedding a color image digital watermark with a large amount of information, there will be greater difficulty in wate...

AI Technical Summary

Problems solved by technology

[0002] With the improvement of people's awareness of copyright protection, the signs used for copyright protection are changing from traditional pseudo-random sequences, binary images, and grayscale images to meaningful color images; however, most of the watermarking methods that have been proposed so far are aimed at For grayscale images, the research on digital watermarking methods for color images is less, mainly because grayscale images are easier to process than color images, and grayscale images only contain luminance information without chrominance information, embedding watermarks in them will not Generate new color components; when embedding a color image digital watermark with a large amount of information, it will be more difficult to encode, embed and extract the watermark, which reduces the invisibility of the watermark

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