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Noise reduction in directional signals using multiple Morse wavelets illustrated on quadrature Doppler ultrasound

Olhede, SC; Walden, AT; (2003) Noise reduction in directional signals using multiple Morse wavelets illustrated on quadrature Doppler ultrasound. IEEE T BIO-MED ENG , 50 (1) 51 - 57. 10.1109/TBME.2002.807322.

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Abstract

The use of multiple complex-valued Morse wavelets for the scalogram study of signals which are unidirectional at any time, but are bidirectional overall is considered. These wavelets are well-suited to identifying the forward and reverse components. Scalogram averaging which is possible due to the multiplicity of the complex-valued wavelets leads to a scalogram with reduced noise. Information from positive and negative scales can then be used to estimate a final "cleaned" scalogram. Quadrature Doppler ultrasound blood flow in the femoral artery is taken as an example to clearly illustrate the noise reduction.

Type: Article
Title: Noise reduction in directional signals using multiple Morse wavelets illustrated on quadrature Doppler ultrasound
DOI: 10.1109/TBME.2002.807322
Keywords: complex wavelets, doppler, scalograms, time-scale analysis, wavelet transform, PHASE
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Statistical Science
URI: http://discovery.ucl.ac.uk/id/eprint/86203
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