H.264/AVC video bitstream oriented large volume data hiding method

Abstract

The invention discloses an H.264 / AVC video bitstream oriented large volume data hiding method, which comprises hidden information embedding and hidden information extraction. The hidden information embedding and the hidden information extraction are directly carried out in an H.264 / AVC bitstream domain, and decoding or partial decoding is unnecessary for the H.264 / AVC bitstream, so that the H.264 / AVC video bitstream oriented large volume data hiding method can well satisfy an application demand of real-time videos. Classification is carried out based on a suffix length of a Level codeword, and information bits in the hidden information are embedded by respectively adopting codeword pairing, single-codeword mapping and multi-codeword mapping, so that data hiding volume of the method is much greater than that of an existing single-codeword mapping; the bitstream structure of the original H.264 / AVC video bitstream is unchanged after the hidden information is embedded by utilizing the method, so that the problems such as increase of a coding bit rate of the whole digital video and change of a file length, caused by the hiding operation, are avoided efficiently, and the hiding security of hidden data is ensured efficiently.

Description

technical field [0001] The invention relates to a video data hiding technology, in particular to a large-capacity data hiding method for H.264 / AVC video code stream. Background technique [0002] Data hiding uses digital objects with clear content such as images, audio or video as digital carriers to hide secret information in digital carriers, requiring that the embedding of secret information does not change the visual or auditory effects of the original digital carrier, so that secret information It can be transmitted through open channels in a way that does not attract the attention of the outside world, so it has greater concealment and security. As an effective means of digital media copyright protection, content authentication and covert communication, data hiding technology has become a research hotspot in the field of multimedia information security. [0003] At present, there are many data hiding methods for uncompressed digital video, but most of the current digi...

AI Technical Summary

Problems solved by technology

However, the high-efficiency compression performance of H.264 / AVC makes it very sensitive to small changes in the coded bitstream, making data hiding in the H.264 / AVC codestream domain very difficult and challenging

At present, there are relatively few data hiding methods directly targeting the H.264 / AVC video stream, and two of them are to embed secret information by mapping equal-length motion vector codewords or reference frame index codewords respectively. However, due to the relatively small number of motion vector codewords or reference frame index codewords that meet the mapping conditions in the H.264 / AVC video code stream, the hidden data capacity of these two methods is limited; another data hiding The method is to embed secret information by mapping residual coefficient codewords of equal length, but this method does not fully explore the characteristics of residual coefficient codewords, and only uses a small part of the H.264 / AVC video stream. Equal-length codewords are used to embed secret information, so that its hidden capacity is also low

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