Geometric attack resisting real-time video watermarking method

Abstract

The invention provides a real-time video watermark method resisting geometric attacks mainly suitable for a video file based on coding. The method directly transforms a partitioning DCT coefficient to an integral DCT coefficient through a quick speed change method, then self-adaptingly modifies a low frequency coefficient value in the integral DCT domain to embedding a watermark signal, transforms a difference value between the watermark embedded integral DCT coefficient and an original coefficient to a difference value of the partitioning DCT coefficient, then rewriting the different value to the partitioning DCT coefficient. The watermark detection is performed in an air space, because a detection process is performed with a video play back, at the same time the video is fully decoded, and is directly performed the integral DCT transformation from the air space, then in order to resist rotary attacks, the detection video is performed a rotary compensation, and is performed a watermark pick-up according to a rule at the embedding time. The results show that the method has very good robustness to a common signal treatment and the conventional geometric attacks (row-column removal, rotation, equal proportion scaling, aspect ratio attack, linear transform, random distortion, cutting and several coalition attacks or the like).

Description

technical field [0001] The invention belongs to the technical field of multimedia information security, and in particular relates to a real-time video digital watermarking method against geometric attacks. Background technique [0002] With the rapid development of information technology and computer network, the storage, reproduction and dissemination of digital multimedia information (image, text, audio, video) has become very convenient. People can not only obtain multimedia information conveniently and quickly through the Internet and CD-ROM, but also obtain copies that are exactly the same as the original data. But the resulting piracy and copyright disputes have become increasingly serious social problems. [0003] Many digital rights management (DRM) frameworks employ end-to-end encryption to protect digital media rights. But once the encrypted media data is decrypted, this protection mechanism is no longer effective. As an effective and most potential method to so...

AI Technical Summary

Problems solved by technology

Among them, the representative method is based on the invariant method, the literature "Rotation, scale and translation invariant spread spectrum digital image watermarking" (O'Ruanaidh, J. and T. Pun. Signal Processing, 1998, 66 (3): 303 -317) proposed a watermarking method based on Fourier-Mellin transform. Although it can resist RST (rotation, scaling and translation) attacks, it still cannot resist other attacks such as cropping, aspect ratio change and shearing often accompanied by RST joint attacks. , the document "Invariant Image Watermark Using ZernikeMoments". (Kim, H.S.and H.-K.Lee.IEEE Transactions on Circuits and Systems for Video Technology, 2003, 13(8): 766-775) proposes an anti-geometric attack based on Zernike moments Watermarking method, the disadvantage of this method is high computational complexity, and it cannot resist attacks such as cropping and aspect ratio changes

Generally speaking, the global digital watermarking method has the following defects: if it belongs to the spatial domain method, it has poor robustness to compression, noise, filtering, etc.; if it belongs to the frequency domain method and embeds the watermark in the frequency of the entire image, then Difficult to resist cropping attacks (such as center cropping)

These require a very large amount of calculation

And in most cases feature extraction and watermark embedding and detection run in different transform domains, which requires more computation

[0007] Among the existing real-time video watermarking methods, DCT domain watermarking and motion vector watermarking have been deeply studied due to their low complexity and good compatibility with coding standards. However, each scheme has its own Advantages and disadvantages, often can not take into account real-time and geometric attack resistance

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