关键词: 分布式视频编码, Wyner-Ziv 视频编码, 重建, 运动补偿

Abstract:

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 pixeldomain 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.

Key words: distributed video coding, Wyner-Ziv video coding, reconstruction, motion compensation