Scalable video coding with robust mode selection

摘要

We propose to improve the packet loss resilience of scalable video coding. An algorithm for optimal coding mode selection for the base and enhancement layers is developed, which limits error propagation due to packet loss, while retaining compression efficiency. We first derive a method to estimate the overall decoder distortion, which includes the effects of quantization, packet loss and error concealment employed at the decoder. The estimate accounts for temporal and spatial error propagation due to motion compensated prediction, and computes the expected distortion precisely per pixel. The distortion estimate is incorporated within a rate-distortion framework to optimally select the coding mode as well as quantization step size for the macroblocks in each layer. Simulation results show substantial performance gains for both base and enhancement layers.