基于场景参考帧的预测帧刷新

为了阻止无线网络视频传输中由于丢包和误码而引发的差错扩散,提出了一种基于场景参考帧的预测帧刷新的抗差错策略.通过对视频序列的分割,对场景内需要同步刷新的视频帧进行基于场景参考帧的预测编码,获得相应预测帧,在编解码端同步场景标志和刷新标志,从而实现预测帧刷新.试验结果表明,与传统的I帧刷新策略相比,在需要高I帧刷新率的不可靠无线网络中,文中策略能够在保持相似重建视频质量的前提下,使帧比特率显著下降.

Predictive Frame Refreshment Based on Scene-Context Reference Frame

In order to avoid the error propagation due to packet loss and bit error during the video transmission in wireless network,a novel error-resilient scheme with predictive frame refreshment is proposed based on scene-context reference frame.By segmenting the video sequences,the corresponding predictive frames locating at the original frames and needing to be intraframe refreshed are predictably coded based on the scene-context reference frame within the same scene scope.The predictive frame refreshment is then implemented by means of the scene-flag and refresh-signal synchronization between the encoder and the decoder.As compared with the traditional intra-frame refreshment method,the proposed scheme can obviously reduce the frame bit rate with a similar reconstructed video quality when the video transmits over an unreliable wireless network that requires high intra-frame refreshment rate.