eprintid: 2416
rev_number: 6
eprint_status: archive
userid: 6
dir: disk0/00/00/24/16
datestamp: 2014-12-11 11:31:01
lastmod: 2014-12-11 11:31:01
status_changed: 2014-12-11 11:31:01
type: book_section
metadata_visibility: show
creators_name: Bevilacqua, Marco
creators_name: Roumy, Aline
creators_name: Guillemot, Christine
creators_name: Alberi-Morel, Marie Line
creators_id: marco.bevilacqua@imtlucca.it
creators_id: 
creators_id: 
creators_id: 
title: Video super-resolution via sparse combinations of key-frame patches in a compression context
ispublished: pub
subjects: QA75
divisions: CSA
full_text_status: none
keywords: Video coding; sparse representations; super-resolution
note: Picture Coding Symposium (PCS), San Jose, USA, 8-11 December 2013
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.
date: 2013-12
publisher: IEEE
pagerange: 337-340
event_title: Picture Coding Symposium (PCS), 2013
id_number: 10.1109/PCS.2013.6737752
refereed: TRUE
isbn: 978-1-4799-0292-7 
book_title: Picture Coding Symposium (PCS)
official_url: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6737752&isnumber=6737661
citation:   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)