Intra-distance Derived Weighted distortion for error resilience
Sunday Nyamweno, Ramdas Satyan, Fabrice Labeau · 2009
Intra coding is one of the most effective ways of reducing the impact of error propagation caused by predictive coding. However, intra coding requires a higher bitrate when compared to inter coding. In order to use Inter coding and reduce error propagation it is important that inter macroblocks predict from ¿safe¿ areas that have a decreased chance of spreading errors. To this end we propose a low complexity method of biasing the prediction mechanism towards recently intra updated macroblocks. We devise a method of adjusting the distortion used in rate distortion optimization to take into account the temporal distance of the last Intra macroblock. Our simulations show that our intra-distance derived weighting (IDW) method improves video coding performance in a lossy environment by up to 1.4 dB for a modest increase in bitrate.