New perspectives and improvements on the symmetric extension filter bank for subband/wavelet image compression.
IEEE Trans Image Process
; 17(2): 177-89, 2008 Feb.
Article
en En
| MEDLINE
| ID: mdl-18270110
In subband/wavelet image coding, size-limited subband decompositions are ordinarily used to avoid increasing the number of samples that need to be coded. To reduce coding distortions that can occur at the borders, the symmetric extension filter bank is typically employed. This paper introduces some new perspectives and improvements to that decomposition. The symmetric extension filter bank is couched in the cyclic frequency domain, providing a framework that accommodates FIR and IIR filters in a natural way, all with perfect reconstruction. IIR filters with both rational and irrational transfer functions can be implemented and, in the context of symmetric extension, can accommodate IIRs that effectively have perfect stopband suppression. Enhancements to the filter bank at a tree-structured system level are also presented and include the application of spectral reversal correction and a transition band normalization approach to designing the constituent filters of the symmetric extension wavelet packet transform.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Algoritmos
/
Gráficos por Computador
/
Procesamiento de Señales Asistido por Computador
/
Interpretación de Imagen Asistida por Computador
/
Aumento de la Imagen
/
Compresión de Datos
Tipo de estudio:
Diagnostic_studies
Idioma:
En
Revista:
IEEE Trans Image Process
Asunto de la revista:
INFORMATICA MEDICA
Año:
2008
Tipo del documento:
Article
País de afiliación:
Australia
Pais de publicación:
Estados Unidos