====== Interpolate ======

If there are unreliable data points (residuals < 0) in any signal it is possible to interpolate these gaps in the data using a spline interpolation.

==== Visual3D Version 4 ====

The interpolation procedure performs a least-squares fit of an nth order polynomial to k data points.

|(x1,t1),...,(xk,tk)|k >= polynomial order + 1||

\\


|**Interpolate**       |                                                                                                                      |
|**/Signal_Types=**    |The type of signal to be processed                                                                                    |
|**/Signal_Names=**    |The names of the signals to be processed                                                                              |
|**/Signal_Folder=**   |The name of the signal folder                                                                                         |
|**/Num_Fit=**         |The number of frames of data before and after the "gap" that are used to calculate the coefficients of the polynomial.|
|**/Polynomial_Order=**|The order of the polynomial used.                                                                                     |
|**/Maximum_Gap=**     |The maximum number of frames of data that can be replaced with interpolated values.                                   |

{{:InterpolateDlg.png}}

Dialog that pops up when pipeline selection is edited by double clicking with the left mouse button.

=== Using an expression in Version 4 ===

This is considerable more klunky because it requires 3 commands instead of 1:

**Evaluate_Expression**
/EXPRESSION=0.1*PARAMETERS::POINT::RATE
/RESULT_NAME=RATE
/RESULT_TYPE=METRIC
/RESULT_FOLDER=TEMP
**;**
**Set_Pipeline_Parameter_To_Data_Value**
/PARAMETER_NAME=GAP
/SIGNAL_TYPES=METRIC
/SIGNAL_NAMES=RATE
/SIGNAL_FOLDER=TEMP
! /SIGNAL_COMPONENTS=ALL_COMPONENTS
**;**
**Interpolate**
/SIGNAL_TYPES=TARGET
! /SIGNAL_NAMES=
! /SIGNAL_FOLDER=ORIGINAL
! /RESULT_SUFFIX=
! /RESULT_FOLDER=PROCESSED
/MAXIMUM_GAP=::GAP
! /NUM_FIT=3
! /POLYNOMIAL_ORDER=3
**;**
==== Visual3D Version 5 ====

In version 5 we permit the three numerical parameters to have expressions.

**Interpolate**
/SIGNAL_TYPES=TARGET
! /SIGNAL_NAMES=
! /SIGNAL_FOLDER=ORIGINAL
! /RESULT_SUFFIX=
! /RESULT_FOLDER=PROCESSED
/MAXIMUM_GAP=0.1*PARAMETERS::POINT::RATE
! /NUM_FIT=3
! /POLYNOMIAL_ORDER=3
**;**
{{:InterpolateDlg2.jpg}}
=== Using an expression in version 5 ===

Define the maximum size of the gap based on the POINT frame rate.
{{:InterpolateDlg3.jpg}}