Gray image watermark embedding and extracting method based on singular value decomposition

Abstract

The invention discloses a gray image watermark embedding and extracting method based on singular value decomposition. The gray image watermark embedding and extracting method based on singular value decomposition comprises the flowing steps: conducting singular value decomposition on an image and obtaining matrix components; conducting encoding and storage on singular values of a diagonal matrix of a singular value matrix and obtaining watermark signals; blocking a hosting image and choosing image blocks high in masking effect; conducting singular value decomposition on the image blocks and embedding the watermark signals into the image blocks; and conducting inverse transformation of the singular value decomposition on the image blocks. The gray image watermark embedding and extracting method based on singular value decomposition has the advantages that the embedding of the gray image watermark image is achieved, the watermark comprises a plurality of straight information, no using limiting exists on the size of the watermark image, and requirements of enterprises concealing personalized enterprise logos as watermarks can be met; the watermark embedding and extracting method can resist a plurality of image aggressive behaviors, and algorithm robustness is high; gray image watermark embedding and extracting method based on singular value decomposition can effectively detect watermark information content, solves the problem of image being illegally issued and the like, and is of great value for healthy and fast development of internet industries.

Description

technical field [0001] The invention relates to a watermark embedding and extraction method, in particular to a grayscale image watermark embedding and extraction method based on singular value decomposition. Involving patent classification number G06 Calculation; Calculation; Counting G06T General image data processing or generation G06T1 / 00 General image data processing. Background technique [0002] Digital watermarking technology is a technology that embeds copyright information such as numbers, serial numbers, text, and image logos into multimedia data. By extracting the information hidden in multimedia data, judging and processing it, it is possible to track the release of multimedia data. For the purpose of use, to confirm the content creator information or to judge whether the data has been tampered with. With the development of Internet technology, a large number of digital images appear on the Internet. In order to protect image copyright and content security, peo...

AI Technical Summary

Problems solved by technology

However, in the prior art, most of the image watermarking algorithms proposed by people hide the binary image watermark or randomly generated numerical sequence as watermark in the host image. The digital watermark information capacity is small, and once the watermark information is destroyed, according to Residual information, it is also difficult to judge copyright information

[0003] Since grayscale images can represent more vivid and intuitive copyright information than binary image watermarks, there are currently few methods for grayscale image watermarking.

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