Block size self-adaptive video steganography method

Abstract

The invention discloses a block size self-adaptive video steganography method, which comprises the following steps: preprocessing secret information data to be embedded to obtain a secret informationbit string, screening a candidate embedded block from a first coded block according to a transform block segmentation characteristic of the coded block, and expressing a segmentation mark of the candidate embedded block in a bit string form; taking two bits out from the secret information bit string sequence to serve as current secret information to be embedded, and embedding the current secret information to be embedded into the current candidate embedded block transformation segmentation mark bit sequence according to a preset embedding rule; extracting three bits from the remaining transform segmentation bits of the current candidate embedded block to serve as a next embedded carrier; if the number of the remaining bits is not enough, taking the remaining bits from the next candidate embedded block in sequence. According to the processing mode, the application of the carrier video in a secret information extraction scene and a secret information non-extraction scene is guaranteed, video distortion caused by information embedding is reduced to the maximum extent, and the video steganography embedding capacity is improved.

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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