Article Outline
Glossary
Definition of the Subject
Introduction
Decomposition View of Random Processes
Wavelets
Signal Estimation or Denoising
2-D Extensions of Wavelets
Covariance Estimation Using Wavelets
Future Directions
Bibliography
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Abbreviations
- Locally stationary process:
-
A stochastic process that when sampled in time, its sampled points have joint characteristics in a short time window that only depend on the difference between the sampled time points, and not the global time point of the samples within the time window.
- Multiresolution analysis:
-
The analysis of a phenomenon of interest over different temporal or spatial scales and locations.
- Shrinkage:
-
A method of estimation where the initialestimator is decreased by multiplication with a factor of magnitude less than or equal to one. If the object being estimated is small, then a reduced variance will arise, that sets off the increased bias in estimation.
- Sparsity:
-
Sparsity in a vector corresponds to the support of the vector being limited. The sparsity can either be strict, i. e. the vector is perfectly supported in a small subset of all its entries, or the magnitudes of the entries decay sufficiently rapidly, if ordered in magnitude.
- Stationary process:
-
A stochastic process that when sampled in time, its sampled points have joint characteristics that only depend on the difference between the sampled time points, and not the global time point of the samples.
- Thresholding:
-
A method of estimation where the initialestimator is set to zero if it does not exceed a given threshold. Thresholding is a special case of shrinkage.
- Wavelet and scaling functions:
-
The functions that the wavelet and scaling filters converge to in increasing scale, when using discrete wavelet filters. These are not for any finite scale equivalent to the wavelet and scaling filters.
- Wavelet and scaling filters:
-
The high and low pass digital filters that are used to calculate the discrete wavelet transform of a given sequence or vector. These are a pair of quadrature mirror filters that satisfy the perfect reconstruction property.
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Olhede, S. (2012). Statistical Applications of Wavelets. In: Meyers, R. (eds) Computational Complexity. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-1800-9_189
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