Filters in MatPIV

After having performed the calculations it is usually necessary to filter the velocity data in order to remove so called spurious vectors (aka outliers). This can be done in MatPIV using four different filters:

1. Signal-To-Noise ratio filter,
2. Peak height filter,
3. global filter and
4. local filter.

The two latter of these files include various methods, global or local, for removing outliers. In this section we will take a look at how to use the velocity filters in MatPIV. We note that all the filters will replace the spurious vectors with NaNs (Not A Number).