Optimal rate allocation for progressive fine granularity scalablevideo coding

摘要

We examine the enhancement-layer rate allocation problem innprogressive fine granularity scalable (PFGS) video coding. The problemnarises from the fact that different frames in the enhancement layer havendifferent rates in PFGS coding. A rate-distortion (R-D) function for anmultiframe group is first established for enhancement-layer PFGS coding,nfollowed by experiments to verify its validity using real testnsequences. Optimal rate allocation among frames in the group is thenngiven based on the R-D function, together with a simple implementationnthat is suitable for applications such as streaming video. Experimentsnshow that, compared with uniform bit allocation, optimal bit allocationnnot only makes the quality variation in decoded video much smoother, butnalso improves the average PSNR of PFGS coding by 0.3-0.5 dB