像素域分布式视频编码双向运动补偿重建算法

Bi-Directional Motion-Compensated Reconstruction Algorithm for Pixel-Domain Distributed Video Coding

为提高分布式视频编码系统解码视频的主客观质量,提出了像素域双向运动补偿重建算法(BMCR).该算法充分考虑了视频中帧内和帧间的相关性,对于边信息落在译码符号对应量化区间内的像素,直接用边信息值进行重建;对于边信息落在译码符号对应量化区间外的像素,利用结合量化区间的双向运动补偿得到合理的重建值.实验结果表明,在Wyner-Ziv视频编码系统中,对于中高等运动强度的视频序列,文中提出的双向运动补偿重建算法比常用的最小均方误差重建算法的峰值信噪比平均提高约0.5 dB,并可有效改善解码视频的视觉质量.

In order to improve the objective and subjective quality of the decoded videos in distributed video coding(DVC) systems,a bi-directional motion-compensated reconstruction(BMCR) algorithm is proposed for the pixel-domain DVC.In this algorithm,the correlation between intra-frame and inter-frame videos is fully considered,and the pixels whose side information falls in the decoded quantization bins are directly reconstructed according to the side information values,while the pixels whose side information falls out of the decoded quantization bins are reasonably reconstructed by the bi-directional motion compensation with quantization bins.Experimental results indicate that,as compared with the commonly-used MMSE(Minimum Mean Square Error) reconstruction algorithm,BMCR algorithm achieves an average PSNR increment of about 0.5 dB and effectively improves the visual quality of the decoded videos for the middle-and high-speed motion sequences in the Wyner-Ziv video coding system.