High-capacity reversible watermark embedding and extracting method as well as implement system thereof

Abstract

The invention discloses a high-capacity reversible watermark embedding and extracting method, which mainly includes the following steps: calculating prediction errors of pixel predicted values of all pixels in an image; constructing a statistic column diagram according to the prediction errors, dividing the pixels in the image into an embeddable pixel set embedded with watermark data, and a movable pixel set capable of moving horizontally; and embedding the watermark data into the pixels with the prediction errors lower than a set threshold value. During embedding, one bit or multiple bits of watermark information is embedded into a single pixel in a self-adaptive manner according to the texture complexity of the image, so that the single embedding rate can achieve more than 2BPP (bits per pixel), and the embedding capability is efficiently improved. In addition, even multiple bits of watermark information are embedded into the single pixel, the used prediction error are still the original prediction errors, therefore, the embedding distortion is efficiently lowered, namely, the higher image quality is ensured on the premise that the embedding capability is efficiently improved.

Description

technical field [0001] The invention relates to the technical field of digital multimedia reversible watermarking, in particular to a large-capacity reversible watermark embedding and extraction method and its realization system. Background technique [0002] In recent years, with the rapid development of digital technology and the Internet, digital multimedia such as images and videos can be obtained in digital form, and it is very easy to copy and reproduce them. There are endless cases of multimedia digital works being illegally used by infringers. In this case, the copyright protection of multimedia digital works is not only a legislative issue, but also a technical issue. How to carry out safe and effective copyright protection for multimedia digital works has become a problem that needs to be solved urgently. Traditional encryption methods have certain limitations in the protection and integrity authentication of multimedia content. In this way, digital rights managem...

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Problems solved by technology

[0009] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to propose a large-capacity reversible watermark embedding and extraction method and its implementation system, to solve the problem of adaptively embedding one-bit or multi-bit watermark information in a single pixel, To improve the copyright management capabilities of digital multimedia works

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