Original title:
Affine Correlation Method for Direct Vorticity, Skew and Displacement Estimation
Authors:
Gronát, Petr Document type: Papers Conference/Event: Topical Problems of Fluid Mechanics 2010, Praha (CZ), 2010-02-10 / 2010-02-11
Year:
2010
Language:
eng Abstract:
In this paper, a correlation method for direct vorticity computation of the fluid velocity field is introduced. The correlation method considering the affine transformation of a correlation window is presented. It is shown, that Lagrangian field of displacements, con- sidering the linear terms only, satis- fyes the requirements for affine transfor- mation. Using the Normalized–Cross– Correlation together with affine trans- formation and Newton-Raphson itera- tive method, six parameters defining the transformation can be estimated. Subse- quently, both displacement and vorticity can be computed using the above men- tioned parameters, hence, the vorticty is being obtained for every single point di- rectly during the correlation procedure.
Keywords:
affine correlation; normalized cross correlation Project no.: CEZ:AV0Z20760514 (CEP), GA101/08/1112 (CEP) Funding provider: GA ČR Host item entry: Topical Problems of Fluid Mechanics 2010, ISBN 978-80-87012-25-3
Institution: Institute of Thermomechanics AS ČR
(web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences. Original record: http://hdl.handle.net/11104/0191240