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Video super-resolution via sparse combinations of key-frame patches in a compression context

Bevilacqua, Marco and Roumy, Aline and Guillemot, Christine and Alberi-Morel, Marie Line Video super-resolution via sparse combinations of key-frame patches in a compression context. In: Picture Coding Symposium (PCS). IEEE, pp. 337-340. ISBN 978-1-4799-0292-7 (2013)

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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.

Item Type: Book Section
Identification Number: 10.1109/PCS.2013.6737752
Additional Information: Picture Coding Symposium (PCS), San Jose, USA, 8-11 December 2013
Uncontrolled Keywords: Video coding; sparse representations; super-resolution
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Research Area: Computer Science and Applications
Depositing User: Ms T. Iannizzi
Date Deposited: 11 Dec 2014 11:31
Last Modified: 11 Dec 2014 11:31
URI: http://eprints.imtlucca.it/id/eprint/2416

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