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...

Images