基于H.266变换域的消除帧内误差传播的视频水印算法研究  

The video watermarking algorithm research for eliminating intra-frame error propagation based on H.266 transform domain

作　　者：罗志伟 林观俊 LUO Zhiwei;LIN Guanjun(Department of Information Engineering,Sanming University,Sanming 365004,China)

机构地区：[1]三明学院信息工程学院,福建三明365004

出　　处：《河南工程学院学报(自然科学版)》2025年第1期73-80,共8页Journal of Henan University of Engineering:Natural Science Edition

基　　金：福建省自然科学基金项目(2021J011131);福建省中青年教师教育科研项目(科技类)(JAT210428)。

摘　　要：针对现有消除帧内误差传播的数字视频水印算法会对编码器的率失真性能造成较大损失的问题,提出了一种基于H.266变换编码的消除帧内误差传播的视频水印算法。水印的嵌入:像素值4×4的亮度块首先经过帧内预测、5种变换核的变换及量化,根据水印的值与变换域直流系数的奇偶性计算偏移值,对5种变换核构造不同的偏移系数,然后根据所使用的变换核,对4×4亮度块量化后的系数做一定偏移,将水印嵌入量化后的系数中。水印的提取:解码端根据4×4亮度块直流系数的奇偶性提取出水印,并计算4×4重构块的空间相关性,修正重构块的偏移像素,缓解水印嵌入造成的像素误差。实验结果表明,所提算法的峰值信噪比平均下降了0.026 dB,码率平均提升了0.047%,算法在嵌入水印的同时不会对边界像素造成误差,可避免将当前块的误差传播至相邻块。Aimed at the problem that existing digital video watermarking algorithms that eliminate intra-frame error propagation would cause greater losses to the rate-distortion performance of the encoder,a video watermarking algorithm based on H.266 transform coding to eliminate intra-frame error propagation was proposed.Watermark embedding:4×4 luminance blocks were subjected to intra-frame prediction,the transformation of five transformation kernels,and quantization,and the offset value was calculated according to the value of the watermark value and the parity of the DC coefficient in the transformation domain,and different offset coefficients were constructed for the five transformation kernels.According to the transformation kernel used,a certain offset was made to the quantized coefficients of the 4×4 block,and the watermark was embedded into the quantized coefficients of the 4×4 luminance block.Watermark extraction:the decoder extracted the watermark according to the parity of the direct current coefficient of the 4×4 luminance block,and calculated the spatial correlation of the 4×4 reconstruction block,corrected the offset pixels of the reconstruction block,and relieved the pixel error caused by the watermark embedding.The experimental results show that the peak signal-to-noise ratio of the proposed algorithm decreased by 0.026 dB on average,and the code rate increased by 0.047%on average.The algorithm does not cause errors to the boundary pixels while embedding the watermark,avoiding the error propagation of the current block to adjacent blocks.

关 键 词：H.266 视频水印 变换编码 误差传播 差错恢复 

分 类 号：TP309.2[自动化与计算机技术—计算机系统结构]