DocumentCode :
3614394
Title :
A smooth extension for the nonexpansive orthogonal wavelet decomposition of finite length signals
Author :
T. Uto;M. Ikehara
Author_Institution :
Dept. of Electron. & Electr. Eng., Keio Univ., Japan
Volume :
3
fYear :
2003
fDate :
6/25/1905 12:00:00 AM
Lastpage :
625
Abstract :
In transform-based image coding, the periodic extension has the disadvantage that it might introduce high frequency components due to the artificial discontinuities at the signal boundaries. On the other hand, the symmetric extension cannot be applied to the two-channel orthogonal filter bank because linear phase is not possible. This paper describes a smooth extension method, which provides the symmetric decimated outputs of the analysis filters at the boundary, for the two-channel orthogonal filter bank to obtain nonexpansive subband signals. In our approach, the extended signal has the flexibility and we calculate the smooth one by singular value decomposition. Finally, several image coding and extended signal examples are shown to confirm the validity of the proposed approach.
Keywords :
"Filter bank","Signal analysis","Signal processing","Image coding","Singular value decomposition","Image reconstruction","Signal synthesis","Nonlinear filters","Distortion","Frequency"
Publisher :
ieee
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP ´03). 2003 IEEE International Conference on
ISSN :
1520-6149
Print_ISBN :
0-7803-7663-3
Type :
conf
DOI :
10.1109/ICASSP.2003.1199552
Filename :
1199552
Link To Document :
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