Digital watermark algorithm based on text document protection

Abstract

The invention discloses a digital watermark algorithm based on text document protection. Implementation of watermark information in a text document consists of watermark embedding and watermark extracting; a watermark embedding treatment process comprises carrier text image pretreatment, ciphertext ID coding, pseudo-random periodic sequence watermark generation and carrier image fusion; and the watermark extracting treatment process comprises image reinforced treatment, extraction of a pseudo-random sequence watermark texture map and decoding of watermark information. For solving the technicalproblem that an existing digital watermark algorithm is poor in robustness, required ID information can be embedded in a text document by the algorithm, and even if a watermarked text is copied, photographed and sheared and the geometric structure of the watermarked text is damaged, watermark information concealed in the watermarked text can still be detected. The digital watermark algorithm based on text document protection can be widely applied to protection and tracing of documents with secret, document copyright protection, web page copyright protection, image mark protection of some commercial products and the like.

Description

technical field [0001] The invention relates to the technical field of digital watermarking, in particular to a digital watermarking algorithm based on text document protection. Background technique [0002] The vigorous development of the Internet requires us to use new methods to protect the intellectual copyright of digital images, videos and documents, and to maintain the data security of multimedia. The popularity of the Internet has led to a large number of images, videos and documents being stolen and used; digital watermarking technology has been proposed to meet such needs, especially the protection of text documents has attracted more attention and in-depth research from users. [0003] An effective watermarking algorithm should at least satisfy the two characteristics of imperceptibility and robustness. With the development of digital watermarking technology today, there are many different algorithms. However, the basic principle of most watermarking technologies...

AI Technical Summary

Problems solved by technology

However, the watermarks added by these methods are very easy to be detected and destroyed, so that the privacy and robustness cannot be well guaranteed.

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