视频会议中前后景均衡技术研究

Equilibrium technology for the foreground andbackground in video meetings

提出一种实现视频会议中前后景分割和比特数分配的技术 .在帧间预测的基础上 ,对序列图像中的运动目标或感兴趣区域 (视频会议中为人脸区域 )进行检测和跟踪 ,从而实现前后景的分割 .该技术可以进一步提高图像数据的压缩比 ,而且还可以更合理地分配码流 ,能在较低比特率的限制下获得更好的主观视频质量 .

This paper proposed a technique to realize the foreground and background segmentation and bits assignment in video meeting. Based on inter frame prediction, the foreground can be segmented from the original image by detecting and tracking moving target or interesting area in image sequence. In a lower rate of bits case, the foreground is assigned more bits to encode to produce a good quality subjectively. It can raise the compression ratio and assign the code flow.