A further assessment of interpolation schemes for window deformation in PIV

Abstract

We have evaluated the performances of the following seven interpolation schemes used for window deformation in particle image velocimetry (PIV): the linear, quadratic, B-spline, cubic, sinc, Lagrange, and Gaussian interpolations. Artificially generated images comprised particles of diameter in a range 1.1 <= d(p) <= 10.0 pixel were investigated. Three particle diameters were selected for detailed evaluation: d(p) = 2.2, 3.3, and 4.4 pixel with a constant particle concentration 0.02 particle/pixel(2). Two flow patterns were considered: uniform and shear flow. The mean and random errors, and the computation times of the interpolation schemes were determined and compared.