Reversible information hiding method based on improved difference expansion

Abstract

The invention discloses a reversible information hiding method based on improved difference expansion. Embedding is carried out on the brightness residual QDCT coefficients of the I frame, every two adjacent QDCT coefficients in each 4*4 block form a pair, coefficient difference values are extracted, the coefficient difference value pairs of the to-be-embedded information are modified, and the purpose of secret information embedding is achieved while the difference values are expanded. Due to the application of an intra-frame prediction mode in H.264 video coding, modification of a residual coefficient causes intra-frame distortion drift, firstly, brightness residual coefficient blocks suitable for embedding are screened according to the intra-frame prediction process and the prediction mode, and the intra-frame distortion drift can be inhibited. Through the improved reversible algorithm, the amplitude of double expansion of the difference value during embedding can be controlled, and the modification amplitude of the coefficient is reduced; and by utilizing the characteristic that the medium-high frequency coefficient value is small after DCT coefficient quantization in video coding, the embedding distortion is reduced, and the higher secret-carrying video quality is obtained.

Description

Technical field [0001] The invention relates to the field of video information hiding, in particular to a reversible information hiding method based on improved difference expansion. Background technique [0002] Information hiding technology is an important technology used to solve security problems such as multimedia copyright protection, authentication and traceability. Traditional information hiding technology emphasizes embedding secret information into the carrier to achieve the purpose of covert communication. This embedding process is often irreversible and will bring permanent distortion to the carrier data. Although traditional information hiding technology requires preservation of the availability of carrier files, as the technology is put into practical applications, especially in military, medical, and judicial applications that have extremely high requirements for data content authentication, even minor distortions are not allowed. In the context of such a demand,...

AI Technical Summary

Problems solved by technology

However, if two macroblocks are lost in a macroblock group, there is a problem of motion vector extraction failure, which in turn affects the error concealment effect of the video

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