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Inter-frame distortion drift analysis for reversible data hiding in encrypted H.264/AVC video bitstreams

机译:帧间失真漂移分析,用于隐藏在加密的H.264 / AVC视频比特流中的可逆数据

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摘要

Due to the privacy-preserving requirement for cloud data management, it is necessary to perform data hiding in the encrypted domain. This paper proposes an effective scheme for reversible data hiding in encrypted H.264/AVC video bitstreams. In the encryption phase, the codewords of intra prediction modes, motion vector differences and partial residual coefficients are encrypted without video bit rate increment for preserving the confidentiality of video content In the data hiding phase, we first present a theoretical analysis of the picture distortion caused by data embedding and the subsequent inter-frame distortion drift Based on the analysis, we estimate the embedding distortions caused by modifying different residual coefficients and embed data into residual coefficients with different priorities for decreasing the inter-frame distortion drift The data embedding is implemented by the histogram shifting technique. If the receiver decrypts the encrypted video bitstream and extracts the embedded data, the original video bitstream can be perfectly recovered. In addition, if the receiver decrypts the encrypted video bitstream without extracting the embedded data, the bitstream can still be decoded to obtain the reconstructed video with good quality.
机译:由于云数据管理需要保护隐私,因此有必要在加密域中执行数据隐藏。本文提出了一种有效的方案,用于在加密的H.264 / AVC视频比特流中隐藏可逆数据。在加密阶段,对帧内预测模式,运动矢量差和部分残差系数的代码字进行加密,而无需增加视频比特率,以保护视频内容的机密性。在数据隐藏阶段,我们首先对引起的图片失真进行理论分析通过数据嵌入和随后的帧间失真漂移,在分析的基础上,我们估计了由于修改不同的残差系数而导致的嵌入失真,并将数据嵌入具有不同优先级的残差系数中,从而降低了帧间失真漂移。直方图移位技术。如果接收器解密加密的视频比特流并提取嵌入的数据,则可以完美地恢复原始视频比特流。另外,如果接收机在不提取嵌入数据的情况下解密加密的视频比特流,则仍可以对该比特流进行解码以获得高质量的重建视频。

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