Time-varying lifting structures for single-tree complexwavelet transform
Author
Keskin, Furkan
Çetin, A. Enis
Date
2012Source Title
2012 20th Signal Processing and Communications Applications Conference (SIU)
Publisher
IEEE
Language
Turkish
Type
Conference PaperItem Usage Stats
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Abstract
In this paper, we describe a single-tree complex wavelet transform method using time-varying lifting structures. In the dualtree complex wavelet transform (DT-CWT), two different filterbanks are executed in parallel to analyze a given input signal, which increases the amount of data after analysis. DT-CWT leads to a redundancy factor of 2 d for d-dimensional signals. In the proposed single-tree complex wavelet transform (ST-CWT) structure, filters of the lifting filterbank switch back and forth between the two analysis filters of the DT-CWT. This approach does not increase the amount of output data as it is a critically sampled transform and it has the desirable properties of DT-CWT such as shift-invariance and directional selectivity. The proposed filterbank is capable of constructing a complex wavelet-like transform. Examples are presented. © 2012 IEEE.
Keywords
Complex wavelet transformsDirectional selectivity
Dual-tree complex wavelet transform
Input signal
Lifting structure
Output data
Redundancy factors
Shift-invariance
Time varying
Filter banks
Forestry
Analysis
Data Processing
Directional Measurement
Filters
Signals