Compression sensing theory-based interactive supported dual watermark generating and detecting method

Abstract

The invention provides a compression sensing theory-based interactive supported dual watermark generating and detecting method. The method comprises a watermark generation part and a watermark detection part, wherein the method for generating the watermark comprises the following steps of: embedding a robustness watermark in a vector image by adopting a classical singular value decomposition (SVD) algorithm, extracting a semi-fragile watermark from an image Aw with a robust watermark, and saving the semi-fragile watermark as a zero watermark; and the method for detecting the watermark comprises the following steps of: extracting the robust watermark from the image to be detected, extracting a semi-fragile watermark from the image to be detected, and comparing the semi-fragile watermark with the registered zero watermark to determine the authenticity and completeness of the image content and recover the tempered part. Different from the condition that two watermarks in the conventionaldual watermark system work independently and even influence each other, the method ensures that the two watermarks cooperate with each other to realize functions to generate a mutually enhancing effect, namely interactive support, which is mainly reflected in the security aspect and the function aspect.

Description

technical field [0001] The invention relates to an interactive support double watermark algorithm. Specifically, it involves a compressed sensing theory and zero watermarking technology, combined with the singular value decomposition theory to form a new interactive support double watermarking algorithm. Background technique [0002] Digital watermarking, as an effective technology to solve the problem of image copyright, has been widely concerned by experts, scholars and engineers for a long time. According to different purposes, digital watermarks can be divided into three categories: robust watermarks, fragile watermarks and semi-fragile watermarks, which are used to achieve copyright protection, content authentication, tampering location and recovery, etc. Existing digital works often need to protect the copyright information and ensure the authenticity and integrity of the content, but most of the general watermarking algorithms are single in function and cannot meet t...

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Problems solved by technology

However, Zhang and Li pointed out in the article "Comments on'AnSVD-Based Watermarking Scheme for Protecting Rightful Ownership'" published in IEEE Transactions on Multimedia Issue 7, Volume 3 in 2005 that the algorithm can be generated from non-copyright images through keys Forged watermarks, although many improvements have been made since then, this serious security risk has not been perfectly resolved

Moreover, two watermarks that work independently of each other often lead to the following defects in the double watermark algorithm: (1) Embedding two watermarks at the same time has a great impact on the visual effect of the image; (2) The two watermarks interfere with each other during the embedding and extraction process, resulting in their own Performance drop

[0004] Conventional digital watermarking methods will modify the carrier image during the process of embedding watermark information. If the two watermark embeddings in the double watermarking algorithm use similar conventional methods, then the visual effect of the carrier image will be seriously affected.

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