无线视频传感阵列低复杂度多视点视频编码方案

基于网络中心节点的运动矢量外推技术,提出了一种无线视频传感阵列的低复杂度多视点视频编码方法。该方法考虑到密集型视频传感阵列各视点间通信复杂、布线繁重、且位于各相机节点内的编码器由于计算能力、功耗等限制难以完成复杂的编码过程等特点,利用运动矢量外推逼近技术将大量的运动估计运算从视频编码端移到了网络中心节点,使得新编解码框架下编码器的运动估计的计算复杂度只有传统全搜索运动估计运算的0.3%,降低了系统传感阵列编码端功耗。实验结果表明,该方法的率失真性能比H.264-I帧高出4 dB以上,接近H.264-P帧编码,优于基于Wyner-Ziv理论的分布式多视点视频编码方法。

A Low Complexity Multi-View Video Coding Scheme for Wireless Video Sensor Array

A novel multi-view video coding scheme with low complexity is proposed for wireless video sensor array based on motion-vector extrapolation at central node of network.It is noted that communication among cameras is difficult for implementation in dense video sensor array,and the encoder embedded in the camera is unable to accomplish complex encoding process due to the limitation of computational capability and power consumption.Therefore,motion-vector extrapolation is utilized to move the motion estimation out of the encoder to the central node of network,so that the complexity of motion estimation at the encoder is reduced to 0.3% compared with the traditional exhaustive block matching algorithm,and the power consumption at the encoder of the sensor array is also reduced.Experimental results show that the proposed method outperforms H.264 intra-frame coding more than 4 dB and approaches to H.264 inter-frame coding,and it also performs better than Wyner-Ziv coding schemes.