A further assessment of interpolation schemes for window deformation in PIV

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.