Intra Coding and Refresh Based on Compression-Oriented Video Epitomic Analysis

in video coding, intra coding plays an important role in both coding efficiency and error resilience, and current intra coding methods still have great potential to be further investigated. In this paper, a high performance intra coding method based on video epitomic analysis is proposed. Epitomic priors suitable for coding are extracted through video epitomic analysis, and are used to generate prediction for each block. The mapping between the original image and image epitome as well as image epitome should be coded and transmitted to the decoder side. Due to the independence of neighboring reconstructed blocks, the proposed intra coding method can also be applied to improve error resilience of intra refresh. If epitomic priors possess enough visual quality, they can also be taken as base-layer video in spatially scalable intra coding. Experimental results show that, the proposed intra coding method can significantly improve the performance of intra coding by 0.64dB in terms of PSNR. The simulation results under packet loss environment show that the proposed intra refresh can out-perform random intra refresh (RIR) by up to 2dB, and better subjective quality can also be obtained. When applied to scalable video coding, the whole coding efficiency of spatially scalable video coding can be improved.