Information hiding method facing to H.264/AVC (automatic volume control) video

Abstract

The invention discloses an information hiding method facing to an H.264 / AVC (automatic volume control) video. The embedding of watermark information is realized through modifying a data communication terminal (DCT) coefficient of a frame I, but for a frame B and a frame P, the embedding of the hiding information is realized through modifying motion vector data (MVD), thus on one hand, the embedded watermark information can be used for authenticating the integrity of the content of the video streaming, and on the other hand, whether the video is attacked is judged, and whether the extracted information is credible and the like at an information detection end according to the integrity of the extracted watermark information, thus ensuring the safety of the private information; as the frame P and frame B in a video sequence are divided into a motion subblocks from the size range of 16*16 to 4*4; the smaller subblock division provides a large amount of MVD data which can provide for hiding the private information, thus the video has larger information hiding capacity; and the process extracting the information is simple and rapid, does not need an original video file for reference, and only needs to decode the DCT coefficient of the frame I and the MVD data of the frame B and frame P, thereby effectively improving the instantaneity and the practicability.

Description

technical field [0001] The invention relates to a video information hiding technology, in particular to an information hiding method for H.264 / AVC video. Background technique [0002] As a secret communication technology, video information hiding has become a new research hotspot in the field of multimedia information security. It embeds important (confidential) information, that is, secret information, into other video carriers that can be disclosed, and realizes the secret transmission of secret information without changing the external characteristics and use value of the video carrier. The key to video information hiding is: 1. On the premise of not significantly affecting the quality and bit rate of the video carrier, obtain a large watermark embedding capacity; 2. The security of the hidden information, the hidden video should avoid causing the attacker’s attention. Note that the information hiding method of the video should be able to detect whether the secret inform...

AI Technical Summary

Problems solved by technology

[0003] The existing research results are all proposed based on the analysis of the relevant characteristics of the H.264 standard, and are mainly divided into the following three types of methods: 1) DCT (Discrete Cosine Transform, discrete cosine transform) coefficients and prediction modes in I frames The embedding of hidden information is realized in , and the scheme of modifying the DCT coefficients of I frames can resist conventional attacks to a certain extent, but it will have a great impact on the code rate, and because the number of I frames is small, the hidden information embedding capacity However, although the scheme of modulating the prediction mode of I4 block to realize hidden information embedding can obtain good video quality, it cannot resist attacks, and this kind of scheme will embed secret information at a designated position in order to resist heavy compression attacks. It is very easy to be cracked, and the extracted secret information has poor credibility and low security

2) Realize the embedding of hidden information in the motion vector. Although it can achieve good vulnerability by modifying the MV (Motion Vector, motion vector) to embed the watermark, it will cause a large increase in the video bit rate. The common point is that it is difficult to resist attacks, and is generally used to implement fragile watermarks; in addition, this type of scheme will have a greater impact on the video bit rate

3) Embed secret information in VLC (Variable-Length Coding, variable-length coding) or CABAC (Context based Adaptive Binary Arithmetic Coding, context-based Adaptive Binary Arithmetic Coding) code stream in combination with entropy coding. Such methods usually Select specific syntactic elements, and embed hidden information by modifying the VLC or CABAC codewords of these syntactic elements in the code stream. The advantage of this method is that it only needs to partially decode the video to realize the embedding and extraction of hidden information, and the calculation is complicated. The degree is low, but because the rate-distortion cost is ignored, the video quality and bit rate will be affected

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