DocumentCode :
3434588
Title :
Adaptive wavelet filter design for optimized image source encoding
Author :
Kumar, Roopesh ; Mitra, Sunanda ; Karp, Tanja ; Nutter, Brian
Author_Institution :
Dept. of Electr. & Comput. Eng., Texas Tech. Univ., Lubbock, TX, USA
fYear :
2003
fDate :
28-30 April 2003
Firstpage :
478
Lastpage :
482
Abstract :
Despite intensive research being conducted on the topic of adaptive filter design in general, adaptive filter design in the discrete wavelet transform (DWT) domain with specific constraints is still an active research area. We have developed a method for the design of a 2-channel perfect-reconstruction adaptive wavelet filter which is optimized under minimum energy constraints in specific bands. The optimal 2-channel conjugate quadrature filter (CQF) bank has been designed using sequential quadratic programming techniques for nonlinear, nonconvex functions in general, although finding a global minimum is not guaranteed. However, such a filter can be effectively used with a wavelet based image encoder for high fidelity transmission of large image data sets at low bit rates.
Keywords :
adaptive filters; channel bank filters; concave programming; discrete wavelet transforms; image coding; image reconstruction; minimisation; nonlinear programming; quadratic programming; quadrature mirror filters; source coding; transform coding; visual communication; 2-channel perfect-reconstruction filter; DWT; adaptive wavelet filter design; conjugate quadrature filter; discrete wavelet transform; high fidelity transmission; large image data sets; low bit rates; minimum energy constraints; nonconvex functions; nonlinear functions; optimal 2-channel CQF bank; optimized image source encoding; sequential quadratic programming; visual communications; wavelet based image encoder; Adaptive filters; Bit rate; Constraint optimization; Design methodology; Design optimization; Discrete wavelet transforms; Filter bank; Image coding; Quadratic programming; Wavelet domain;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Information Technology: Coding and Computing [Computers and Communications], 2003. Proceedings. ITCC 2003. International Conference on
Print_ISBN :
0-7695-1916-4
Type :
conf
DOI :
10.1109/ITCC.2003.1197576
Filename :
1197576
Link To Document :
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