Class for scaling the velocity field¶

If during the piv process the interrogation or search window size or distance is decreased, the velocity field has to be scaled to the new GridSpec.

class piv.velocity_scaler.VelocityUpscaler(new_grid_spec, old_grid_spec)[source]¶

Class for scaling the velocity field according to GridSpec

Initialization of the scaler.

The old and new grid specifications are loaded and a meshgrid according to the new grid is calculated.

Parameters:	new_grid_spec (GridSpec) – GridSpec of the new field old_grid_spec (GridSpec) – GridSpec of the old field

After the setup the scaling is done by an other function.

VelocityUpscaler.scale_field(f)[source]¶

Scaling of the field according to calculated meshgrid.

For the interpolation rectangular bivariate Splines are used. These are implemented from the scipy function RectBivariateSpline.

Parameters:	f – field to be interpolated
Returns:	field after interpolation