Naslov
Optimised Delta Low-Pass Filter for UMCTF

Autori
Šprljan, Nikola ; Mrak, Marta ; Izquierdo, Ebroul

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the International Conference on Visual Information Engineering, VIE 2006 / - , 2006

Skup
International Conference on Visual Information Engineering 2006

Mjesto i datum
Bangalore, Indija, 26.09.2006. - 28.09.2006

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
scalable video coding; optimised motion compensated temporal filtering

Sažetak
This paper provides a performance analysis of the delta lowpass filterbank used in Unconstrained Motion Compensated Temporal Filtering (UMCTF) of video frames. Any wavelet filterbank for which a two-step (one prediction and one update) lifting implementation exists has a delta low-pass filter variant, where the modification consists of not performing the update step. Benefits of using such filters are better temporal scalability performance and lower decoding delay. We argue that in that case the normalisation factor for the highpass subband needs to be carefully selected in order to improve the decoding performance. We derive expressions for the Riesz bounds and introduce the measure of the expected difference of energies in signal and transform domain, for the Haar wavelet with delta low-pass filter. Then we optimise the normalisation factor in respect to the minimal Riesz bounds ratio and minimal expected difference. The application of optimised filterbank with delta low-pass in a scalable video environment shows enhanced decoding performance on all bitrates and lower temporal resolutions.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

POVEZANOST RADA