Synchronous self-adaptable watermark method based on image continuity

Abstract

An adaptive synchronous watermark method based on image connectivity includes converting original grey scale image to be two-valued image, obtaining connecting through image, mapping it into grey scale image, selecting relatively big gravity as reference point to embed watermark and ensuring adaptive synchronization of watermark by utilizing unchanged topology and stable gravity of image.

Description

technical field [0001] The invention relates to an adaptive synchronous watermarking method based on image connectivity, which is a robust image watermarking method suitable for copyright protection of digital image products and providing infringement proof. Background technique [0002] At present, in the field of digital watermarking research, the robust watermarking system is the most widely studied watermarking system, which is inseparable from the need of copyright protection in practical applications. At present, in the research of robust watermarking, from the relevant published literature, many robust watermarking methods have shown their superior robustness when resisting Gaussian noise, JPEG compression and filtering and other noise-like signal processing attacks. , but it is powerless against geometric attacks such as rotation, scaling, translation, shearing, local distortion, etc. The reason is that the watermark needs to rely on additional asynchronous informati...

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Problems solved by technology

In the digital watermarking research work in recent years, many robust watermarks that can resist geometric attacks have also appeared, such as the literature "Geometrically Invariant Watermarking Based on Gravity Center," (K.Ding, C.He, L.G Jiang, H.X.Wang , IEEE Trans.Fundamental, vol.E87-A, no.2pp.513-515, Feb.2004.) proposed a center-of-gravity-based robust watermark against geometric attacks, although the watermarked image is in any rotation angle and scaling factor It still shows strong robustness, but the reference point for watermark embedding is based on the center of gravity of the entire image, so for local geometric distortion and shearing operations, the watermarking scheme fails, while the anti-geometry proposed by other literature Robust watermarking for attacks, such as the literature "A feature-based robust digital image watermarking scheme," (C.W.Tang and H.M.Hang, IEEE Trans.Signal Processing, vol.51, no.4, pp.950-959, April2003.) The proposed watermarking scheme based on feature points is often not very stable because the reference points (feature points) used for watermark embedding are not very stable, resulting in unsatisfactory watermark robustness

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