Redundant Picture Coding Using Residual-Adaptive Polyphase Downsampling for H.264 Error Resiliency

This paper presents a redundant picture coding method that employs polyphase downsampling (PD) technique adaptive to the energy of residual signal and efficiently enhances the error resiliency of H.264. The latest H.264 hierarchically allocates redundant pictures and encodes them with reference picture selection, which effectively restrains temporal error propagation. The proposed method takes advantage of the current redundant picture coding scheme and applies residual energy adaptive PD to the residual signal coding. A neighbor-friendly pixel construction method is also presented which further enhances the reconstruction quality. Simulation results show that the proposed method favorably improves the H.264 error resiliency by 0.5 dB on average in terms of the PSNR.