Advantage: Efficient removal of erroneous velocity vectors.

Instantaneous velocity fields almost always contain some erroneous velocity vectors, due to various imperfections in the measurements. FtrPTV-3D identifies such erroneous vectors by comparing each computed vector with the mean or median of the neighboring vectors, where the neighborhood extends both in space and time. A vector differing much from the mean or median, respectively, is identified as erroneous and subsequently replaced.