Image digital watermark embedding system and method

Abstract

The invention discloses an image digital watermark embedding system and method based on an SVM (support vector machine) and DWT (discrete watermark transform). According to the method, first, watermark evaluation parameters are set, including similarity NC for measuring watermark robustness and a peak signal-to-noise ratio (PSNR) for measuring watermark invisibility; a weight beta between the two parameters is determined according to a demand; an SVM method is utilized to perform machine learning on a training set, and a regression prediction model about watermark embedding strength is established to predict optimal watermark embedding strength of a to-be-embedded original image; and last, DWT is adopted to embed a digital watermark into the original image.

Description

technical field [0001] The invention relates to the technical field of information security, in particular to an image digital watermark embedding system and method. Background technique [0002] With the rapid development of information technology, information security issues have become increasingly prominent. Digital watermarking technology embeds watermark information into digital products (including multimedia, documents, software, etc.), and then identifies the source, creator and other copyright information of digital products, which has become a research hotspot in the field of digital product copyright protection. To realize the function of copyright protection, digital watermark should have two characteristics: one is robustness, which means that after signal processing (including channel noise, cutting, rotation, etc.), digital watermark can maintain partial integrity and can be extracted and identification; the second is concealment, which means that the digital...

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Problems solved by technology

However, in the prior art, the watermarking algorithm is used to directly embed the digital watermark into the image. In this process, since there is no reference model for the embedding strength of the digital watermark, the embedding strength of the digital watermark cannot be accurately controlled. Usually less robust and stealthy

[0004] In addition, in the prior art, the block discrete cosine transform is usually used for digital watermarking of images, but the problem with this method is that when digital watermarking of images, there will be inherent block effects, which will affect the robustness of digital watermarking. stickiness and stealth

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