Digital picture watermark embedding and detecting method and device

Abstract

The invention discloses a digital picture watermark embedding and detecting method and a device thereof for improving the capacity of a digital picture for resisting geometric attacks in the transmission process. The digital picture watermark embedding method comprises the steps that data information needing to be embedded is generated into at least one watermark sub-block, and synchronous templates corresponding to the watermark sub-blocks are constructed; areas to be embedded corresponding to the watermark sub-blocks are determined in the digital picture; the alternating-current coefficientsequence of each image sub-block in each embedded area on a discrete cosine transformation (DCT) domain is obtained; and according to the information in each watermark sub-block and the information of the corresponding position in the corresponding synchronous template, the corresponding alternating-current coefficient in the corresponding alternating-current coefficient sequence is revised so asto realize the embedding of the watermark and the synchronous template.

Description

technical field [0001] The invention relates to the technical field of digital image watermarking, in particular to a method and device for embedding and detecting watermarks in digital images. Background technique [0002] With the popularization of Internet communication, network downloading has become a common way of information transmission, and it also poses challenges to the security of digital carriers, especially the copyright and path tracking of digital image works. In an open network environment, it has become the development direction of digital image watermarking technology to track various misappropriation information while maintaining copyright interests. During its commercial transmission, digital images will inevitably undergo various operations or attacks, such as cropping, scaling, rotation, contrast changes, exposure changes, Jpeg compression, and so on. These attacks are often encountered together and are difficult to resist, so they have attracted more...

AI Technical Summary

Problems solved by technology

This type of autocorrelation method has good robustness to rotation, scaling, translation and aspect ratio changes, but this method cannot resist attacks such as cropping well, and at the same time, the synchronization template and effective watermark information may interfere with each other

Also, embedding of sync templates can degrade the quality of the supporting artwork

[0005] In short, the existing digital watermarking methods cannot effectively support cropping attacks, the extraction of watermark information is unstable, and the visual effect is poor, which greatly limits the practicability of such digital watermarking methods.

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