Robust image watermark detecting method based on fuzzy classification

Abstract

The invention discloses a robust image watermark detecting method based on fuzzy classification. The robust image watermark detecting method comprises the following steps: in a watermark-containing image correcting process, extracting an eight-circumcircle lower PHT matrix (low 7-order), obtained by circumcircle lower PHT decomposition, of a to-be-detected image, taking the eight-circumcircle lower PHT matrix as a training characteristic to combine with a fuzzy support vector machine theory, training a sample to obtain a training module for performing geometric correction. The fuzzy vector machine FSVM has very good learning capacity and the matrix obtained by PHT decomposition has high precision, so that watermark information under different attacks can be correctly extracted, and the watermark robustness is improved. Moreover, the method has the characteristics of simple calculation, no need of an initial carrier during watermark extraction, and the like, so that the copyright protection practicability of digital image works is strengthened.

Description

technical field [0001] The invention belongs to the technical field of information hiding and digital watermarking in multimedia information security, especially a kind of watermarking technology that not only has better imperceptibility, but also is suitable for conventional signal processing (median filtering, edge sharpening, superimposed noise and JPEG compression, etc.) and Desynchronization attacks (rotation, translation, scaling, shearing, flipping, etc.) are robust image watermark detection methods based on fuzzy classification. Background technique [0002] Digital watermarking (Digital Watermarking), as an effective supplementary method to traditional encryption methods, is a new technology that can protect copyright and authenticate the source and integrity in an open network environment. A hot spot of research. The so-called digital image watermark is to hide a mark (watermark) with a specific meaning in a digital image product by means of data embedding to prov...

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Problems solved by technology

[0003] The so-called desynchronization attack does not mean that the attack can remove the watermark information from the watermarked image, but that it can destroy the synchronization of the digital watermark components (that is, change the watermark embedding position), so that the detector cannot find a valid watermark

In recent years, a series of digital image watermark detection methods have been proposed successively, but unfortunately, the existing digital image watermark detection methods mainly focus on fighting against conventional signal processing (such as lossy compression, low-pass filtering, noise interference, etc. ), but the resistance to geometric attacks such as rotation, scaling, translation, row and column removal, shearing, etc. is not good

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