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The locally stationary dual-tree complex wavelet model

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<mark>Journal publication date</mark>11/2018
<mark>Journal</mark>Statistics and Computing
Issue number6
Number of pages16
Pages (from-to)1139-1154
Publication StatusPublished
Early online date26/10/17
<mark>Original language</mark>English


We here harmonise two significant contributions to the field of wavelet analysis in the past two decades, namely the locally stationary wavelet process and the family of dual-tree complex wavelets. By combining these two components, we furnish a statistical model that can simultaneously access benefits from these two constructions. On the one hand, our model borrows the debiased spectrum and auto-covariance estimator from the locally stationary wavelet model. On the other hand, the enhanced directional selectivity is obtained from the dual-tree complex wavelets over the regular lattice. The resulting model allows for the description and identification of wavelet fields with significantly more directional fidelity than was previously possible. The corresponding estimation theory is established for the new model, and some stationarity detection experiments illustrate its practicality.