A Rate Allocation Scheme for Progressive Fine Granular Scalable Video Coding

The enhancement layer rate allocation problem is examined in progressive fine granular scalable (PFGS) video coding.The problem arises from the fact that different frames in the enhancement layer have different rates in PFGS coding.A rate distortion (R D) function for a multi frame group is first established for enhancement layer PFGS coding,followed by experiments to verify its validity using real test sequences.Optimal rate allocation among frames in the group is then given based on the R D function,together with a simple implementation that is suitable for applications like streaming video.Experiments show that,compared with uniform bit allocation,optimal bit allocation not only makes the quality variation in decoded video much smoother,but also improves the average PSNR of PFGS coding by 0 3～0 5dB.