A Blind Watermarking Method for Two-Color Image Based on Remainder Code

Abstract

The invention discloses a double-color image blind watermarking method based on an ary excess code. A large-capacity color image is used as a digital watermark and embedded into a color host image so that copyright protection needs based on a color-image identification are met. The invention proposes a definition of the ary excess code and through adjustment of the ary excess code of pixel data of the host image, no-binary-system watermark information is embedded. During extraction of the watermark, through use of the ary excess code which contains the watermark image, the watermark can be extracted without help of an original watermark or an original host image so that an objective of blind detection is achieved. The method is simple and fast and higher in watermark embedding quantity and watermark invisibility. The double-color image blind watermarking method based on the ary excess code is suitable for using a color digital image as copyright protection of a 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] As the main carrier of network information, color digital images are prone to forgery, abuse, infringement and other bad behaviors. Facing the reality of multimedia copyright protection, it is necessary to strengthen the research on digital watermarking technology of color images with high information content. Most of today's image digital watermarking methods use binary or grayscale images as digital watermarks, and relatively few use color digital images as digital watermarks. The main reason is that when color digital images are used as watermarks, the amount of information contained in them is the same. The size of the grayscale image is 3 times that of the binary image, and it is 24 times that of the binary image, which increases the difficulty of w...

AI Technical Summary

Problems solved by technology

[0003] In the research of digital watermark technology in recent years, although the blind detection digital watermark method has gradually become the mainstream of the development of digital watermark technology, but because the copyright protection information contained in the color digital image is very large, it can be more conveniently embedded with the non-blind watermark method. Or extract the watermark. Many existing color image digital watermarking methods focus on non-blind watermarking. Therefore, how to change the status quo and realize the blind extraction of color watermarked images is one of the difficulties in the current image digital watermarking technology.

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