Video super-resolution via sparse combinations of key-frame patches in a compression contextReportar como inadecuado

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1 Sirocco - Analysis representation, compression and communication of visual data Inria Rennes – Bretagne Atlantique , IRISA-D5 - SIGNAUX ET IMAGES NUMÉRIQUES, ROBOTIQUE 2 Alcatel Lucent Bell Labs

Abstract : In this paper we present a super-resolution SR method for upscaling low-resolution LR video sequences, that relies on the presence of periodic high-resolution HR key frames, and validate it in the context of video compression. For a given LR intermediate frame, the HR details are retrieved patch-by-patch by taking sparse linear combinations of patches found in the neighbor key frames. The performance of the video SR algorithm is assessed in a scheme where only some key frames from an original HR sequence are directly encoded; the remaining intermediate frames are down-sampled to LR and encoded as well, with a possibly different quantization parameter. SR is then finally employed to upscale these frames. For comparison, we consider the best case where the whole original HR sequence is encoded. With respect to this case, our SR-based approach is shown to bring a certain gain for low bit-rates consistent when all frames are encoded independently, i.e. when a poor encoding can actually benefit of the special processing of the intermediate frames, so proving that video SR can be an useful tool in realistic scenarios.

Autor: Marco Bevilacqua - Aline Roumy - Christine Guillemot - Marie-Line Alberi Morel -



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