TY  - CHAP
EP  - 340
T2  - Picture Coding Symposium (PCS)
N1  - Picture Coding Symposium (PCS), San Jose, USA, 8-11 December 2013
ID  - eprints2416
SP  - 337
N2  - 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.
A1  - Bevilacqua, Marco
A1  - Roumy, Aline
A1  - Guillemot, Christine
A1  - Alberi-Morel, Marie Line
PB  - IEEE
SN  - 978-1-4799-0292-7 
UR  - http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6737752&isnumber=6737661
TI  - Video super-resolution via sparse combinations of key-frame patches in a compression context
AV  - none
KW  - Video coding; sparse representations; super-resolution
Y1  - 2013/12//
ER  -