caa a22 4500 606198040 CHVBK 20210128100932.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s00348-015-2062-z doi (NATIONALLICENCE)springer-10.1007/s00348-015-2062-z Quantification and adjustment of pixel-locking in particle image velocimetry [Elektronische Daten] [R. Hearst, B. Ganapathisubramani] A quantification metric is provided to determine the degree to which a particle image velocimetry data set is pixel-locked. The metric is calculated by integrating the histogram equalization transfer function and normalizing by the worst-case scenario to return the percentage pixel-locked. When this metric is calculated for each position in the vector field, it is shown that pixel-locking is non-uniform across the field. Hence, pixel-locking adjustments should be made on a vector-by-vector basis rather than uniformly across a field, although the latter is the common practice. A methodology is provided to compensate for the effects of pixel-locking on a vector-by-vector basis. This includes applying a Gaussian filter directly to the images, processing the images with window deformation, ensuring the vector fields are in pixel displacements, applying histogram equalization calculated at each vector coordinate, and mapping the adjusted vector fields to physical space. Springer-Verlag Berlin Heidelberg, 2015 Hearst R. Engineering and the Environment, University of Southampton, SO17 1BJ, Southampton, UK aut Ganapathisubramani B. Engineering and the Environment, University of Southampton, SO17 1BJ, Southampton, UK aut Experiments in Fluids Springer Berlin Heidelberg 56/10(2015-10-01), 1-5 0723-4864 56:10<1 2015 56 348 https://doi.org/10.1007/s00348-015-2062-z text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 review-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-2062-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hearst R. Engineering and the Environment, University of Southampton, SO17 1BJ, Southampton, UK aut NATIONALLICENCE 700 1- Ganapathisubramani B. Engineering and the Environment, University of Southampton, SO17 1BJ, Southampton, UK aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/10(2015-10-01), 1-5 0723-4864 56:10<1 2015 56 348