caa a22 4500 606198369 CHVBK 20210128100933.0 cr unu---uuuuu 210128e20150801xx s 000 0 eng 10.1007/s00348-015-2036-1 doi (NATIONALLICENCE)springer-10.1007/s00348-015-2036-1 Comparison between optical flow and cross-correlation methods for extraction of velocity fields from particle images [Elektronische Daten] [Tianshu Liu, Ali Merat, M. Makhmalbaf, Claudia Fajardo, Parviz Merati] This paper presents direct comparisons between the physics-based optical flow and well-established cross-correlation methods for extraction of velocity fields from particle images. The accuracy and limitations of the optical flow method applied to particle image velocimetry are critically evaluated. After a brief review of the optical flow method, we discuss in detail the error estimates, relevant parameters to the accuracy of optical flow computation, and mathematical connection between the optical flow and the particle velocity. Quantitative evaluations of both the optical flow and correlation methods are made through simulations and physical flow measurements. Springer-Verlag Berlin Heidelberg, 2015 Liu Tianshu Department of Mechanical and Aerospace Engineering, Western Michigan University, G-217, Parkview Campus, 49008, Kalamazoo, MI, USA aut Merat Ali Department of Mechanical and Aerospace Engineering, Western Michigan University, G-217, Parkview Campus, 49008, Kalamazoo, MI, USA aut Makhmalbaf M. Department of Mechanical and Aerospace Engineering, Western Michigan University, G-217, Parkview Campus, 49008, Kalamazoo, MI, USA aut Fajardo Claudia Department of Mechanical and Aerospace Engineering, Western Michigan University, G-217, Parkview Campus, 49008, Kalamazoo, MI, USA aut Merati Parviz Department of Mechanical and Aerospace Engineering, Western Michigan University, G-217, Parkview Campus, 49008, Kalamazoo, MI, USA aut Experiments in Fluids Springer Berlin Heidelberg 56/8(2015-08-01), 1-23 0723-4864 56:8<1 2015 56 348 https://doi.org/10.1007/s00348-015-2036-1 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-2036-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Liu Tianshu Department of Mechanical and Aerospace Engineering, Western Michigan University, G-217, Parkview Campus, 49008, Kalamazoo, MI, USA aut NATIONALLICENCE 700 1- Merat Ali Department of Mechanical and Aerospace Engineering, Western Michigan University, G-217, Parkview Campus, 49008, Kalamazoo, MI, USA aut NATIONALLICENCE 700 1- Makhmalbaf M. Department of Mechanical and Aerospace Engineering, Western Michigan University, G-217, Parkview Campus, 49008, Kalamazoo, MI, USA aut NATIONALLICENCE 700 1- Fajardo Claudia Department of Mechanical and Aerospace Engineering, Western Michigan University, G-217, Parkview Campus, 49008, Kalamazoo, MI, USA aut NATIONALLICENCE 700 1- Merati Parviz Department of Mechanical and Aerospace Engineering, Western Michigan University, G-217, Parkview Campus, 49008, Kalamazoo, MI, USA aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/8(2015-08-01), 1-23 0723-4864 56:8<1 2015 56 348