Diginal image blind watermark adding, extracting and removing method suitable for internet

Abstract

The invention discloses a digital image blind watermark adding method suitable for internet, which comprises the steps of: acquiring the original images of a watermark image and a watermark to be added, binarizing the watermark image, conducting Arnold scrambling, and then modifying part of intermediate frequency coefficient transformed by DCT, thus realizing the embedding of the watermark; the invention correspondingly discloses a digital image blind watermark extracting method which realizes watermark extraction by detecting the part of intermediate frequency coefficient transformed by DCT,and a watermark removing method which is realized by modifying the part of intermediate frequency coefficient transformed by DCT; the algorithm is simple and reliable, the method is suitable for beingrealized by the internet, neither the extracting or removing of watermark needs the participation of the original image; and the embeded invisible watermark has stronger capability of anti-JPEG compression attack, also has extremely strong robustness to sharpening attack and shearing attack, and is used for implicit identification digital image copyright.

Description

technical field [0001] The present invention relates to digital watermark technology of image data. Background technique [0002] With the deepening of the application of digital technology and Internet technology, various digital media are published and disseminated through the Internet, and legal disputes arising from network intellectual property infringement issues frequently occur, and the copyright protection and information integrity assurance of multimedia digital works are gradually become an important issue that urgently needs to be resolved. [0003] A prerequisite for solving the above-mentioned problems is the authentication problem of multimedia digital works. Traditionally, digital works have generally been protected using cryptography. Although encryption technology can better protect the content in transmission, it cannot solve the protection problem when the information is received and decrypted. The basic idea of ​​digital watermarking is to embed infor...

AI Technical Summary

Problems solved by technology

For example, the Chinese Invention Patent Application Publication No. CN101038661A discloses a blind watermark embedding and extraction method based on a regression support vector machine. Based on regression, the watermark information is embedded into the blue component, which has a certain impact on the color of the color image. By comparing and predicting The relationship between the value and the actual value realizes the extraction of the watermark. Whether to embed the watermark is mainly determined by visual comparison. It cannot be judged whether the image is embedded with the watermark in advance, and there is a lack of corresponding watermark information removal methods.

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