HEVC video information hiding method based on intra-frame prediction mode difference

Abstract

The invention discloses an HEVC video information hiding method based on intra-frame prediction mode difference. The HEVC video information hiding method based on the intra-frame prediction mode difference includes that modulating a prediction mode and embedding secret information in an intra-frame prediction coding process for a 4*4 prediction unit through analyzing an HEVC coding and decoding structure, and using the difference between prediction modes of two continuous 4*4 prediction units to embed two-bit or three-bit secret information according to different mapping rules to improve the hiding capacity. Because the prediction mode correction greatly influences the subjective and objective quality of the video after embedding the secret information, the HEVC video information hiding method based on the intra-frame prediction mode difference embeds the two-bit secret information for two prediction units with prediction modes 0 or 1 according to the parity modification prediction mode of the secret information and embeds the three-bit secret information for two prediction units with directional prediction modes through the difference between the prediction modes of two prediction units, and the secret information is not embedded under the other situations; the HEVC video information hiding method based on the intra-frame prediction mode difference lowers the video quality reduction due to embedding secret information.

Description

technical field [0001] The present invention relates to an information hiding technology, in particular to an information hiding method for HEVC (High Efficiency Video Coding) video based on intra-frame prediction mode difference. Background technique [0002] With the rapid development of Internet technology, the application and dissemination of digital multimedia information is becoming more and more popular, and the issue of information security has become increasingly prominent. The rapid development of information hiding technology has become an effective means of secret communication and copyright protection, which can effectively curb the illegal use of digital multimedia. In the information hiding technology research of digital multimedia, the information hiding technology of digital video is an extremely important part, and it is widely used. Due to the huge data volume of digital video itself, it is usually stored and transmitted in a compressed form. [0003] HE...

AI Technical Summary

Problems solved by technology

Among them, in the study of the concealment scheme based on the modulation prediction mode, it was proposed to complete the embedding according to the mapping relationship between the prediction mode of the intra-frame 4×4 luminance block and the hidden information by modulating the intra-frame prediction mode, but this information hiding scheme is due to the mapping relationship It is established based on the statistical results of multiple video test sequences, and different video test sequences may have differences, so this information hiding scheme is not universally applicable; it has also been proposed to establish secret information and prediction models by introducing matrix coding The mapping relationship, to embed two bits of hidden information in 4×4 luminance blocks in 3 frames, only need to modify one bit of prediction mode; someone else embeds in 4×4 luminance blocks in 7 frames by introducing an embedding / extraction matrix For three-bit secret information, only one bit of prediction mode needs to be modified. This information hiding scheme effectively avoids the rapid increase of the bit rate, but the embedded capacity of the secret information is not high.

[0004] The information hiding algorithm for HEVC video is still in its infancy, and because the encoding structure of HEVC is different from that of H.264 / AVC, the information hiding algorithm for H.264 / AVC video cannot be directly applied to HEVC video

Someone proposed a HEVC-based video information hiding algorithm, which uses the Lagrangian rate-distortion model to adaptively select the intra-frame coding mode to decide whether to embed hidden information, and the modulation prediction mode becomes the one that matches the parity of the hidden information. The prediction mode with the least rate-distortion overhead in the mode, and the texture complexity operator LBP is used to screen the brightness blocks in the frame, and the area with high texture complexity is selected as the embedding area. However, due to the lossy compression of the video, the reconstructed pixel value of the decoding end There are differences from the original pixel values ​​at the encoding end, and there will be differences when extracting secret information at the decoding end, resulting in inconsistencies in the extracted secret information. Therefore, in order to solve this technical problem, it is necessary to record the starting point of the embedded block at the encoding end as a key transmission to the decoding end, but this increases the insecurity of the information

It is also proposed that according to the statistical probability distribution of the optimal prediction mode and the suboptimal prediction mode, the group mapping relationship between the prediction mode and the secret information is established, and the prediction mode is modulated based on the mapping relationship to embed the secret information, and one bit of carrier information is modified to embed two bits of secret information. Information, the replacement prediction mode selects the adjacent mode with similar prediction effect, and the embedding capacity is greatly improved, but the subjective and objective quality of the embedded video and the embedding capacity are closely related to the statistical grouping mapping table. Due to the limitations of statistics, the reason for grouping is not It is sufficient, and does not have universal adaptability. The bit rate of the video increases by more than 2%, and the PSNR value drops by more than 0.05dB, so it has a great impact on the embedded video

In summary, the existing information hiding algorithms for HEVC video still have room for improvement in terms of hiding capacity, video reconstruction quality after embedding hidden information, and information security.

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