H.264/AVC video information hiding method based on predictive mode

Abstract

The invention discloses an H.264/AVC video information hiding method based on a predictive mode. For a macro block whose coding mode is Intra_4*4 in an I chip, a predictive mode of a 4*4 luma block is modulated to a suboptimal predictive mode from an optimal predictive mode under the circumstance that the predictive mode of the 4*4 luma block needs to be changed, and for macro blocks whose coding modes are marked not by 0 in a P chip and a B chip, a coding mode of a macro block is modulated to a suboptimal predictive mode from an optimal predictive mode under the circumstance that the predictive mode of the macro block needs to be changed; the impact on the objective quality of a video, caused by the change of the predictive mode or the coding mode, can be reduced as much as possible under the circumstance of ensuring that the secret information can be effectively hidden at the same time; on the other hand, due to the fact that the secret information not only can be embedded in the macro block whose coding mode is Intra_4*4 in the I chip but also can be embedded in the macro blocks whose coding modes are marked not by 0 in the P chip and the B chip, the higher hiding capacity can be obtained.

Description

technical field [0001] The invention relates to a video information hiding technology, in particular to a prediction mode-based H.264 / AVC video information hiding method. Background technique [0002] As an effective means of digital media copyright protection, content authentication and covert communication, information hiding technology has become a research hotspot in the field of multimedia information security. Information hiding technology uses the characteristics of human perception and the redundancy of digital media itself to embed secret information or copyright information into the host carrier signal. The host carrier signal can be images, audio, video, text, etc. Compared with encryption technology, information hiding technology has greater concealment and security because any third party other than the two parties in the communication does not know the existence of secret communication. [0003] At present, the vast majority of video information hiding methods...

AI Technical Summary

Problems solved by technology

However, the emergence of the H.264 / AVC video compression coding standard with high-efficiency compression coding performance has greatly increased the difficulty of embedding and extracting hidden information. After the prediction residual data is transformed and quantized by DCT, non-zero DCT coefficients are rare and non-zero The amplitude of the DCT coefficient is small, and the method of embedding hidden information by modifying the DCT coefficient is difficult to apply to the video carrier of the H.264 / AVC standard

To this end, researchers are also exploring video information hiding techniques based on the new features of the H.264 / AVC video compression coding standard. One of the methods is to modify the luminance and chrominance samples in IPCM (Intra-frame PulseCode Modulation) macroblocks. Bits are used to embed secret information, but the number of IPCM macroblocks is very small, which makes the embedding capacity of secret information small. If some macroblocks are forced to be encoded by IPCM, the coding efficiency will be reduced; other methods are by limiting The type of macroblock between frames or within a frame is used to embed hidden information. The hidden information hiding capacity of this method is small, that is, each macroblock can only embed 1 bit of information, and the change of macroblock type will affect the video quality and coding. Bit rate has a big impact

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