Method and device for uniting digital water print based on singular value analysis and spread spectrum technique

Abstract

The method includes two parts: embedding digital watermark and picking-up watermark. The first part of embedding codes of digital watermark includes: singular value decomposition for original image, spread spectrum of watermark information, embedding watermark, singular value decomposition for image with watermark being embedded, forming image with watermark finally. The second part of decoding image of picking up digital watermark includes singular value decomposition for image with watermark, picking up watermark, singular value decomposition for image with watermark being removed out, recovering original image finally. Comparing with prior art, the invention raises security and robustness of watermark evidently. polytecnica of singular value decomposition and spread spectrum etc. utilized in the invention raises amount of information of watermark, making image with watermark possess high robustness so as to reach target of protecting copyright protection.

Description

technical field [0001] The invention belongs to the fields of information security, image processing and pattern recognition. It uses computer software to embed data in digital images to achieve the purpose of copyright protection. Specifically, it is a unified digital watermark (Digital The method and device of Watermarking based on Singular Value Decomposition (SVD) and Spread Spectrum Technology are to expand the copyright information by means of spread spectrum first, and then embed it into the singular value decomposition domain of the original image. Background technique [0002] With the rapid development of computer networks, information security issues are very prominent. As a new information security technology, information hiding technology has been adopted in many application fields. At present, it is also attracting more and more attention from research institutions and business circles, and its main driving force comes from people's need...

AI Technical Summary

Problems solved by technology

Since this method hides information by adjusting the lowest bits of the original data, it is difficult for ordinary users to perceive the hidden information visually.

Although it has a large amount of information embedding, as a digital watermarking method, due to the limitation of its basic principle, the hidden digital watermarking information is extremely fragile and cannot withstand some lossy signal processing.

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