In this paper we provide a complete and unifying characterization of compactly supported univariate scalar orthogonal wavelets and vector-valued or matrix-valued orthogonal multi-wavelets.This characterization is based on classical results from system theory and basic linear algebra. In particular, we show that the corresponding wavelet and multi-wavelet masks are identified with a transfer function \$\$ F(z)=A+B z (I-Dz)^{-1} , C, quad z in D={z in C : |z| &lt; 1},\$\$of a conservative linear system. The complex matrices \$A, B, C, D\$ define a block circulant unitary matrix. Our results show that there are no intrinsic differences between the elegant wavelet construction by Daubechies or any other construction of vector-valued or matrix-valued multi-wavelets. The structure of the unitary matrix defined by \$A, B, C, D\$ allows us toparametrize in a systematic way all classes of possible wavelet and multi-wavelet masks together with the masks of the corresponding refinable functions.

### System theory and orthogonal multi-wavelets

#### Abstract

In this paper we provide a complete and unifying characterization of compactly supported univariate scalar orthogonal wavelets and vector-valued or matrix-valued orthogonal multi-wavelets.This characterization is based on classical results from system theory and basic linear algebra. In particular, we show that the corresponding wavelet and multi-wavelet masks are identified with a transfer function \$\$ F(z)=A+B z (I-Dz)^{-1} , C, quad z in D={z in C : |z| < 1},\$\$of a conservative linear system. The complex matrices \$A, B, C, D\$ define a block circulant unitary matrix. Our results show that there are no intrinsic differences between the elegant wavelet construction by Daubechies or any other construction of vector-valued or matrix-valued multi-wavelets. The structure of the unitary matrix defined by \$A, B, C, D\$ allows us toparametrize in a systematic way all classes of possible wavelet and multi-wavelet masks together with the masks of the corresponding refinable functions.
##### Scheda breve Scheda completa Scheda completa (DC)
2019
Quadrature mirror filters, Unitary Extension Principle, Transfer function, Wavelets
File in questo prodotto:
File
Chiarina_2019_JAT_System_editor.pdf

non disponibili

Tipologia: Versione Editoriale (PDF)
Utilizza questo identificativo per citare o creare un link a questo documento: `https://hdl.handle.net/20.500.12318/2597`
• ND
• 5
• 5