Naslov
Adaptation criterions for wavelet filter banks with variable zero moments

Autori
Seršić, Damir

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

Izvornik
Proceedings of MELECON 2000 – 10th Mediterranean Electrotechnical Conference / Economides, Pattichis, Maliotis, Papconstantinou, Michelides, Sc - Nikozija : Violaris Press Ltd., Nikozija, Cipar, 2000, Vol. II, pp. 603-606

Skup
MELECON 2000 – 10th Mediterranean Electrotechnical Conference

Mjesto i datum
Limassol, Cipar, 29.05.2000. - 31.05.2000

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
adaptation criterions; variable zero moments; wavelets; time-varying filter banks

Sažetak
In this paper, we compare different criterions of adaptation in the proposed two-channel wavelet filter bank with variable number of zero moments. Generally, filters with more zero moments are more appropriate for representing smooth parts of the analyzed signal, while shorter filters are better for transients and singularities. Depending on the criterion, filter banks that change number of zero moments at each step of decomposition can outperform fixed banks in a number of applications. When applied to signals, variable zero moment wavelets result in low ripple on edges and good concentration of wavelet coefficients in smooth parts. Error signal is formed from filtered wavelet coefficients and therefore available on the reconstruction side. We discuss different adaptation algorithms based on spectral properties, adaptation interval and causality. Chosen criterion determines decomposition properties, as well as its reproducibility on the reconstruction side. Results on synthetic and real signals are presented.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

POVEZANOST RADA