Abstract: 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.

Key words: Low delay,Slice,Acquisition,Coding,Intra,Video