A video steganography method with adaptive block size

Abstract

The invention discloses a video steganography method with an adaptive block size. The secret information bit string is obtained by preprocessing the secret information data to be embedded, and the candidate embedding is obtained by screening the first coding block according to the transformation block segmentation feature of the coding block. block, and represent the segmentation mark of the candidate embedding block in the form of a bit string; take two bits from the secret information bit string sequence as the current secret information to be embedded, and embed the current secret information to be embedded into the current secret information according to the preset embedding rules Candidate embedding block transformation segmentation mark bit sequence; extract three bits from the remaining transformation segmentation bits of the current candidate embedding block as the next embedding carrier, if the remaining bits are not enough, sequentially from the next candidate embedding block Until the embedding of the secret information bit string sequence is completed, this processing method not only ensures the application of the carrier video in two scenarios of secret information extraction and non-extraction, but also minimizes the video distortion caused by the embedded information, and improves the video concealment. Write embedded capacity.

Description

technical field [0001] The invention belongs to the field of information security, and in particular relates to a video steganography method with an adaptive block size. Background technique [0002] Video steganography refers to secretly embedding secret information in popular mainstream video files, so as to achieve the purpose of video file copyright protection, content authentication, and covert communication. Since compressed video streams are more compatible with actual network transmission scenarios, embedding secret information in the process of compressing video files into streams has become an underlying technology in many video steganography applications. [0003] In the existing video steganography technology based on the H.265 / HEVC video compression process, the technology of embedding hidden information by modifying the segmentation marks in the intra-frame and inter-frame coding parameters is currently more focused on the prediction unit, coding Adaptive segm...

AI Technical Summary

Problems solved by technology

As a further improvement, some scholars have proposed a method of using error concealment technology to embed hidden information in the intermediate frequency coefficients of the transform domain to realize video steganography. This algorithm has the advantage of greatly improving the embedding capacity under the premise of the same visual quality. , but its algorithm is only applicable to video files encoded and decoded by the H.264 / AVC standard. For high-resolution videos encoded and decoded by the H.265 / HEVC standard used in 4K today and in the future, its method is not suitable Applicable because H.265 / HEVC adopts a new coding structure and prediction and transformation mechanism

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