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Top1.Introduction
With the development of digital multimedia technology, more multimedia resources are widely used (Mohanarathinam, A., Kamalraj, S., & G, K. D., 2019). However, in the process of video transmission and storage, some important information may be illegally tampered, misappropriated and attacked. Information hiding is a technology to embed data into media content, which mainly including steganography and digital watermarking. The technology has been used in many application scenarios, such as ownership declaration protection, privacy protection and covert communication (Ning.Y.X,2019).
To meet the demands of diversity of video application and the high trend of definition about the video compression performance requirements, high efficiency video coding (HEVC) is jointly developed by the International Telecommunication Union (ITU) and the Motion Picture Expert Group (MPEG). Based on H.264/AVC, it improves the compression of the performance and develops the new coding technologies. Therefore it can be better applied to the development of high-definition and ultra-high-definition video (Sullivan.G.J,Ohm.J.R&Han.W.J,2012). Consequently, HEVC video information hiding technology has become a research hot spot.
HEVC video information hiding technology uses redundant information of video signal to hide secret information in the carrier. According to the different modification positions when the information is been embedded, the algorithms can be divided into four categories, i.e., prediction mode based modification, DST/DCT coefficient based modification, motion vector based modification and entropy coding based modification.
Chang et al. (2014) proposed a DCT / DST based information hiding algorithm for the first time, which effectively controlled the intra distortion drift; Liu et al. (2018) proposes a readable data hiding algorithm, which embedded the message in the fast brightness and could effectively avoid the problems of intra frame distortion drift and maintain the video quality. Li et al. (2016) uses the motion vector space to modify the N motion vector components in CTU as the carrier embedding the information. Yang et al. (2018) proposed an information hiding algorithm to modify the motion vector in P frame. Guo et al. (2020) proposed a new video steganography algorithm based on motion vector, the motion trend based (MTB) mapping strategy establish between motion vector and binary bit stream, which ensured the minimum additional distortion and steganography security.