Color image watermark detection method based on invariant-moment geometric correction

Abstract

The invention discloses a color image watermark detection method based on invariant-moment geometric correction. According to the method, in a process of correcting an image containing a watermark, amplitude values of eight low-order quaternion exponential moments of an image to be detected are calculated and are used as training features, and the least square support vector machine theory is combined for training the sample to obtain a training model, so that the geometric correction is carried out, the quaternion exponential moments and the support vector machine theory are combined, a system has the advantages that the digital watermark robustness can be effectively improved, and meanwhile, the watermark information quantity and the imperceptibility of the digital watermark are ensured. In addition, the method has the characteristics of simplicity in calculation and the like, and the practicability of the method for being used for digital image mark copyright protection is enhanced.

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 to color image watermark detection methods based on moment-invariant geometric correction. 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 mea...

AI Technical Summary

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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