Journal
EXPERIMENTS IN FLUIDS
Volume 38, Issue 4, Pages 511-515Publisher
SPRINGER
DOI: 10.1007/s00348-005-0942-3
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An explicit solution of two-dimensional Gaussian regression for the estimation of particle displacement from the correlation function in particle image velocimetry (PIV) or particle position from the images in particle tracking velocimetry (PTV) with sub-pixel accuracy is introduced. The accuracy and the ability of the methods to avoid pixel locking due to non-axially orientated, elliptically shaped particle images or correlation peaks are investigated using simulated and experimentally obtained images.
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