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Published 1995 | Version public
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Noise reduction by discrete image shifting in DPIV

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Abstract

Image shifting by removing the integer-pixel displacement in cross-correlation analysts of single-exposure digital image pairs optimizes the accuracy for estimating the location of the displacement-correlation peak in digital particle image velocimetry (PJV). The effect is predicted by an analytical model for the statistical properties of estimators for the displacement. The predicted noise reduction is observed in the analysis of synthetic PIV images of isotropic turbulence and in actual measurements of grid-generated turbulence.

Additional Information

© 1995 Begell House. The research of dr.ir. J. Westerweel has been made possible by a fellowship of the Royal Netherlands Academy of Arts and Sciences. The visit of dr.ir. J. Westerweel to the C.Q.V. was supported by URI (N00014-92-J-1618) from the Office of Naval Research.

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41294
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CaltechAUTHORS:20130912-131326617

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Royal Netherlands Academy of Arts and Sciences
Office of Naval Research (ONR) URI
N00014-92-J-1618

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2013-09-12
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2023-03-14
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