HEVC帧内预测模式和分组码的视频信息隐藏

为了在最新的视频压缩标准－高效视频编码(HEVC) 下实现信息隐藏并在保证隐秘信息嵌入容量的前提下减少对宿 主信息的修改,提出基于帧内预测模式和分组码的HEVC视频信息隐藏方法。首先,利用分组 码的标准阵 列译码方法,建立(4,3)码标准阵列译表；然后,根据译码表与预测模式的映射关系,调 制帧内4×4亮 度块的预测模式嵌入隐秘信息；最后,对调制后的4×4亮度块重新编码,使得在连续4个4× 4帧内亮度 块嵌入3bit隐秘信息,平均修改1.25位预测模式,减小因调制预测模式对视频造成的影响 。实验结果表 明:所提算法的PSNR值下降在0.05 dB以内,码率增长在1%左右 ,算法能很好的保证视频主客观质量,对视频的编码比特率影响很小。

Video information hiding in intra prediction and block codes for HEVC

At the premise of ensuring embedding capacity,to reduce the modification of hos t for high efficiency video coding (HEVC) information hiding, which is the latest video compression standard ,an information hiding algorithm for HEVC based on intra prediction and block codes is proposed. In the first place,we establish a (4,3) standard array decoding table with the principle of the standard array. Then we modify the intra prediction modes in 4×4luminance blocks according to the mapping between the matrix and the prediction mode. Finally,re-encode the changed block with the substitutive prediction mode.It makes that four 4×4luminance blocks embed 3bit information and modify 1.25prediction modes on average,which reduces the impact of the prediction mode modulation on the quality of the video. Experimental results show that the bit-rate increases by about 1% an d the peak signal-to-noise ratio (PSNR) loss is just about 0.05dB. The proposed hiding algorithm can effectively embed information with little infl uence on the bit-rate and quality of the cover video.