Adaptive H.264 compressed domain video watermark embedding and extracting method

A technology for video watermarking and watermark extraction, applied in the field of information security, can solve the problems of image distortion, poor video adaptability, small motion vector amplitude, etc., to prevent the spread of errors, enhance robustness, and prevent frame scrambling. Effect

Active Publication Date: 2011-01-19
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If you choose a fixed threshold, the adaptability to the video is poor
For example, for a news broadcast video with a fixed background, the magnitude of the motion vector is generally small. If the preset threshold is large, the watermark capacity may not be met.
If a small threshold is set in advance, there may be too many watermarks embedded in one frame when encountering a video with intense motion, resulting in image distortion
[0006] The drift distortion caused by modifying the motion vector residual needs to be compensated. The ordinary compensation effect is poor. Although the re-execution of the motion estimation process can avoid error diffusion, the computational complexity is high and the efficiency is extremely low.
[0007] Therefore, the above existing technologies can realize watermark embedding to a certain extent, but are lacking in watermark capacity, implementation efficiency, and computational complexity.

Method used

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  • Adaptive H.264 compressed domain video watermark embedding and extracting method
  • Adaptive H.264 compressed domain video watermark embedding and extracting method
  • Adaptive H.264 compressed domain video watermark embedding and extracting method

Examples

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Embodiment 1

[0043] Step 1: Expand and encode the watermark information to be hidden, and add a synchronization flag, specifically:

[0044] a) First convert the hidden information m into a binary bit sequence B;

[0045] B) scrambling the binary bit sequence B to obtain the scrambling bit sequence B';

[0046] c) Encoding the scrambled bit sequence B' to avoid the same bit stream as the synchronization flag;

[0047] The scrambling method is as follows:

[0048] For the existing N-bit one-dimensional watermark sequence A[0, 1, 2, ..., N-1], select the smallest positive integer P that is relatively prime to N, and the sequence B with a length of N is used to temporarily store the result .

[0049] Perform the following transformations:

[0050] a) B(i)=A((i×P)mod N), i=0, 1, 2,..., N-1

[0051] b) A=B

[0052] By repeating the above transformation multiple times, the one-dimensional sequence can be scrambled.

[0053] This scheme draws lessons from the method of the frame interval s...

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Abstract

The invention relates to an adaptive H.264 compressed domain video watermark embedding and extracting method in the technical field of information security, which can realize the real-time operation of video information hiding. The threshold value of a motion vector is adaptively adjusted according to watermark embedding amount statistical data of an adjacent frame, so that watermark capacity is ensured and the requirement of embedding a one-time watermark among a few frames is met; and error diffusion caused by modifying the motion vector is accurately positioned in a partial interframe prediction mode, so that good drift and distortion compensation effects can be achieved.

Description

technical field [0001] The invention relates to a method in the technical field of information security, in particular to a motion vector-based adaptive H.264 compressed domain video watermark embedding and extraction method. Background technique [0002] With the popularization of Internet technology, the Internet has become one of the main sources of information for people after newspapers and television. However, online video is widely favored because of its large amount of information and high real-time content. However, due to the large number of uploaded videos, websites often lack comprehensive and effective review methods for uploaded video content. It is not uncommon for videos to be illegally authorized to copy and republish videos on video websites, and problems such as the supervision of online video content have become increasingly prominent. In response to this demand, the use of video watermarking technology can achieve copyright protection, video source iden...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/32G06T1/00H04N19/467H04N19/70
Inventor 孙锬锋蒋兴浩周悦陆欢
Owner SHANGHAI JIAO TONG UNIV
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