Original title: Processing flow visualisation records by correlation coefficient evaluation in sub-images
Authors: Tesař, Václav ; Něnička, Václav
Document type: Papers
Conference/Event: ENGINEERING MECHANICS 2010, Svratka (CZ), 2010-05-10 / 2010-05-13
Year: 2010
Language: eng
Abstract: Authors introduced a new method of processing flow visualisation images,aiming at identification of instability structures. In principle, the method utilises the structures' coherence. In two digital images, recorded at slightly differentinstants of time, the pixel pairs from the same position in the images are interrogated one by one. In each, vectors of the recorded quantity values are formed from n x n pixels in immediate neighbourhood, which form the sub-image. The correlation coefficient is then computed for the vector pair. High positive values of the coefficient indicate absence of change whereas values near zero indicate chaotic changes. Of interest are negative values, which indicate a coherent motion.
Keywords: correlation coefficient; flow visualisation; image processing; infrasound
Project no.: CEZ:AV0Z20760514 (CEP), GA101/07/1499 (CEP), IAA200760705 (CEP)
Funding provider: GA ČR, GA AV ČR
Host item entry: Engineering Mechanics 2010, ISBN 978-80-87012-26-0

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/11104/0185704

Permalink: http://www.nusl.cz/ntk/nusl-41471


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Research > Institutes ASCR > Institute of Thermomechanics
Conference materials > Papers