Stabilized lifting steps in noise reduction for non-equispaced samples

Evelyne Vanraes; Maarten Jansen; Adhemar Bultheel

doi:10.1117/12.449729

5 December 2001 Stabilized lifting steps in noise reduction for nonequispaced samples

Evelyne Vanraes, Maarten Jansen, Adhemar Bultheel

Proceedings Volume 4478, Wavelets: Applications in Signal and Image Processing IX; (2001) https://doi.org/10.1117/12.449729
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

This paper discusses wavelet thresholding in smoothing from non-equispaced, noisy data in one dimension. To deal with the irregularity of the grid we use so called second generation wavelets, based on the lifting scheme. We explain that a good numerical condition is an absolute requisite for successful thresholding. If this condition is not satisfied the output signal can show an arbitrary bias. We examine the nature and origin of stability problems in second generation wavelet transforms. The investigation concentrates on lifting with interpolating prediction, but the conclusions are extendible. The stability problem is a cumulated effect of the three successive steps in a lifting scheme: split, predict and update. The paper proposes three ways to stabilize the second generation wavelet transform. The first is a change in update and reduces the influence of the previous steps. The second is a change in prediction and operates on the interval boundaries. The third is a change in splitting procedure and concentrates on the irregularity of the data points. Illustrations show that reconstruction from thresholded coefficients with this stabilized second generation wavelet transform leads to smooth and close fits.

Citation Download Citation

Evelyne Vanraes, Maarten Jansen, and Adhemar Bultheel "Stabilized lifting steps in noise reduction for nonequispaced samples", Proc. SPIE 4478, Wavelets: Applications in Signal and Image Processing IX, (5 December 2001); https://doi.org/10.1117/12.449729

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