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针对当前HEVC视频信息隐藏算法对视频码率和质量影响较大等问题,结合HEVC编码标准中帧内预测模式的特点,提出一种基于帧内预测模式差值的HEVC视频信息隐藏算法。对于连续两个帧内4×4亮度块预测编码过程中具有方向性的33种预测模式,建立隐秘信息与预测模式差值的映射关系,根据拉格朗日率失真模型调制预测模式完成隐秘信息的嵌入。为了保证隐秘信息的嵌入容量,对于连续两个无方向性的planar模式或DC模式,根据隐秘信息修改其值实现隐秘信息的嵌入。信息的提取过程,只需对码流中的预测模式解码即可。实验结果表明,隐秘信息的嵌入对视频序列的影响较小,亮度分量的峰值信噪比(PSNR)值平均下降约0.05dB,对码率影响仅在1.1%以下,隐秘信息嵌入前后的结构相似度(SSIM)值均在0.94以上。因此,本文算法能很好保证视频的主客观质量。
Aiming at the problems that the current HEVC video information hiding algorithm greatly affects the video bit rate and quality, a HEVC video information hiding algorithm based on intra prediction mode difference is proposed according to the characteristics of the intra prediction mode in the HEVC coding standard. For the 33 prediction modes with directivity in 4 × 4 luma block prediction coding process in two consecutive frames, the mapping between covert information and prediction mode difference is established, and the covert information is completed by modulating the prediction mode according to the Lagrange rate distortion model Embedded. In order to ensure the embedded capacity of secret information, for two consecutive non-directional planar mode or DC mode, according to the secret information to modify its value to embed secret information. Information extraction process, only the code stream prediction mode can be decoded. Experimental results show that the embedding of steganographic information has less influence on the video sequence, the PSNR value of average brightness component decreases by about 0.05dB on average, and the influence on the bit rate is only less than 1.1%. The structure of the hidden information before and after embedding is similar Degree (SSIM) values are above 0.94. Therefore, this algorithm can well guarantee the subjective and objective quality of video.