基于菱形编码的视频信息隐藏算法

针对基于视频帧内预测模式调制的信息隐藏算法嵌入容量较小、比特率上升较明显等问题，提出一种基于菱形编码的帧内视频信息隐藏算法。该算法基于高效视频编码（HEVC），将相邻两个4×4块预测模式组成模式对，采用改进的菱形编码算法指导模式调制和信息嵌入过程；并采取二次编码方式在保留原始平台最优编码划分下进行第二次隐秘信息嵌入编码，在保证嵌入量的同时抑制帧内失真漂移。实验结果表明：所提算法峰值信噪比（PSNR）值下降在0.03dB以内，码率增长低于0.53%，嵌入量有大幅提升，并能很好地保证视频主客观质量。

Video information hiding algorithm based on diamond coding

Aiming at the problems of limited hiding capacity and obvious increasing bit rate in the existing hiding solutions, an intra-frame video information hiding algorithm based on diamond coding was proposed. Firstly, based on High Efficiency Video Coding (HEVC), two prediction models of adjacent 4×4 blocks were combined into a pattern pair, then the improved diamond coding algorithm was used to guide pattern modulation and information embedding. Next, the embedding coding for hidden informtion was done for second time with keeping the optimal coding division, thus ensuring the embedding quantity and eliminating intra frame distortion drift. The experimental results show that the Peak Signal-to-Noise Ratio (PSNR) is reduced by less than 0.03dB and the bit rate is increased by less than 0.53% by using the proposed algorithm, while the embedding capacity is greatly improved, and both the subjective and objective qualities of the video are well guaranteed.