摘要
为了减小视频传输中错误的影响,提高解码端重建视频质量,根据H.264/AVC标准的特点,提出了一种基于宏块分块模式预测和双模式叠加的时域错误隐藏方法。方法先对受损宏块进行宏块级运动补偿和残差修复,得到宏块级隐藏结果;然后利用受损宏块邻块分块模式和边缘特点预测受损宏块分块模式,分模式进行子块运动矢量估计和补偿;最后将宏块级隐藏结果与预测模式运动补偿结果进行双模式叠加,得到最终替代块。实验表明,方法较传统方法在PSNR及视觉上都有一定的优越性。
In order to improve the video quality in wireless video applications,an error concealment method based on macroblock mode prediction and double-mode overlapping is proposed to reconstruct the missing block.It utilizes the blocks＇ modes surrounding and simple edge detection method to predict the missing block mode,and do the error concealment depending on the block mode.Three steps are included as below.Firstly,the whole macroblock is concealed by motion compensation.Secondly,the block mode is predicted.Finally,it estimates the motion vector of the lost macroblock depending on the block mode,and overlapped the result with the first step.Simulation results show that it outperforms the other conventional methods in PSNR and improves the visual quality.
出处
《计算机安全》
2011年第1期2-6,共5页
Network & Computer Security
