Information hiding and extracting method based on integer DCT (Discrete Cosine Transformation) coefficient modulation

Abstract

The invention provides an information hiding and extracting method based on integer DCT (Discrete Cosine Transformation) coefficient modulation. An N-dimensional 2N+1-order magic cube matrix is constructed, carrier coefficients are respectively mapped in the N-dimensional 2N+1-order magic cube matrix by taking N carrier coefficients as a group, so as to obtain a mapping value, a value of to-be-embedded 2N+1 system number secret information is compared with the mapping value, if the two values are equal, the group of the carrier coefficients do not need to be modified, if the two values are not equal, only one carrier coefficient needs to be modified, so that the mapping value is equal to the to-be-embedded value, one carrier coefficient is modified, so that the embedding of formula bits of the secret information is completed, the embedding efficiency reaches up to formula, and the modification rate of the carrier coefficient is only 1 / N, so that a computing process is simple, and the information hiding and extracting efficiency is improved.

Description

technical field [0001] The invention relates to the field of information hiding, in particular to an information hiding and extracting method based on integer DCT coefficient modulation. Background technique [0002] The continuous development of information technology has brought convenience to people's life, but it has also brought many problems such as information authentication, copyright protection, and secret communication. Information hiding technology can solve these problems well. It is a technology that embeds secret information into common carriers, and achieves the purpose of transmitting secret information by hiding the secret communication itself. [0003] The increasingly mature Internet and digital multimedia application technology make the transmission and exchange of audio, image, video and other multimedia information very convenient. Because of its intuition, determinism, and high efficiency, video information, especially the continuous development of n...

AI Technical Summary

Problems solved by technology

[0004] The above several information hiding methods have the following problems: intra-frame prediction mode modulation only appears in I frame; motion vector modulation can only be applied when there is inter-frame estimation; entropy coding directly modifies code stream elements will introduce large video distortion ; while integer transforms appear in all types of coded frames, the large capacity of the carrier means large embedding capacity. In addition, information hiding algorithms based on modulation of integer transform coefficients generally have low complexity and do not require re-encoding, which is more suitable for real-time coding process, has the advantage of a wider utilization of space

However, the existing integer transform coefficient modulation information hiding methods have problems such as low embedding efficiency and large increase in code rate introduced.

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