一种基于条带划分的低延迟帧内编码方法

现有编解码系统所产生的固有延迟比较大,例如对于标清视频,系统延迟要大于260ms,因此难以用于对延迟有严格要求的系统中。为此,研究了一种新的低延迟帧内编解码结构,在该结构中,将输入的视频划分成若干个条带,在采集端以条带为单位进行采集,以有效降低采集延迟;同时,给出了以条带为基本单位的I帧编码方法,对每一编码条带下采样,将其分成4个子图,以子图为单位进行预测,以提高预测的精度,进而降低编码延时。实验表明,新的编码结构在采集和编码过程中能有效降低帧内编码延迟,在保证恢复图像质量的同时,可以将延迟降低到150ms。

Slice-based Partition Low Delay Intra Frame Coding Method

The inherent delay of the standard codec system is relatively large,for example,for standard definition video,the system delay exceeds 260ms.It is very difficult to be applied in the system that has strict requirement on delay.On the basis of existing standards,a new low delay intra coding structure was provided in the paper.The input video is divided into a number of slices,and slice is the basic code unit at the acquisition end.Slice-based acquisition method can effectively reduce the acquisition delay,at the same time,I-frame coding method is different from existing standard in which each acquisition slice is the basic coding unit and it is divided into four sub-pictures.In order to improve the prediction accuracy,one of sub-picture was chosen as prediction unit.Experiments show that the new structure can effectively reduce intra coding delay and acquisition delay,which can be reduced to 150ms.