High-Quality Vector Field and Direct Vorticity Estimation Uusing the Affine Correlation Method

0352080 - ÚT 2011 RIV CZ eng C - Conference Paper (international conference)
Gronát, Petr
High-Quality Vector Field and Direct Vorticity Estimation Uusing the Affine Correlation Method.
Engineering Mechanics 2010. Prague: Institute of Thermomechanics AS CR, v. v. i., 2010 - (Zolotarev, I.), s. 35-36. ISBN 978-80-87012-26-0.
[ENGINEERING MECHANICS 2010. Svratka (CZ), 10.05.2010-13.05.2010]
R&D Projects: GA ČR GA101/08/1112; GA ČR GAP101/10/1230
Institutional research plan: CEZ:AV0Z20760514
Keywords : PIV * normalized cross correlation * affine correlation * vortex detection
Subject RIV: BK - Fluid Dynamics

We present a correlation method for direct vorticity computation of the fluid velocity field. The correlation method allows the affine transformation of a correlation window. It is shown that Lagrangian field of displacements is locally affine considering linear terms only. Using the Normalized-Cross-Correlation (NCC) combined with affine transformation and Newton-Raphson iterative method, six parameters defining this transformation are estimated. Subsequently, using these parameters, both displacement and vorticity can be computed, hence, these properties are being obtained for every single pixel directly during the correlation procedure.
Permanent Link: http://hdl.handle.net/11104/0191671