Table of Contents
Metric Time of Minimum from Event
Overview
The Metric Time of Minimum from Event command can be used to compute the time between an event and a minimum signal. For example, this command could be used to determine the time between initial foot contact with the ground and minimum grf. The command can be found in the Pipeline Workshop under Metric.
Pipeline Command
The command syntax is as follows:
Metric_Time_Of_Minimum_From_Event ! /RESULT_METRIC_TIME= ! /RESULT_METRIC_VALUE= ! /RESULT_FOLDER=PROCESSED ! /RESULT_COMPONENTS=ALL ! /SIGNAL_TYPES= ! /SIGNAL_FOLDER=ORIGINAL ! /SIGNAL_NAMES= ! /SIGNAL_COMPONENTS= ! /FRAME_OFFSET=0 ! /TIME_OFFSET= ! /EVENT_SEQUENCE= ! /EXCLUDE_EVENTS= ! /EVENT_SEQUENCE_INSTANCE=0 ! /EVENT_SUBSEQUENCE= ! /SUBSEQUENCE_EXCLUDE_EVENTS= ! /EVENT_SUBSEQUENCE_INSTANCE=0 ! /EVENT_INSTANCE=0 ! /FRAME_WINDOW=8 ! /THRESHOLD= ;
Command Parameters
The following table shows the command parameters seen above and their descriptions:
| /RESULT_METRIC_TIME= | Time of minimum from event. |
| /RESULT_METRIC_VALUE= | Value of minimum after event. |
| /RESULT_FOLDER= | Name of folder designated for results. |
| /RESULT_COMPONENTS= | Components to be included in results. |
| /SIGNAL_TYPES= | The type of signal to be processed |
| /SIGNAL_NAMES= | The name of the signal to be processed |
| /SIGNAL_FOLDER | The folder of the signal to be processed |
| /SIGNAL_COMPONENTS= | The component of the signal to be processed |
| /FRAME_OFFSET= | The offset (in frames) to apply to the event. |
| /TIME_OFFSET= | The time offset (in seconds) to apply to the event. |
| /EVENT_SEQUENCE= | A list of events (separated by “+” signs). |
| /EXCLUDE_EVENTS= | This Event_Sequence must not be during the sequence requested. |
| /EVENT_SEQUENCE_INSTANCE= | Index of the sequence instance to evaluate (0 = all, 1 = first, etc.). |
| /EVENT_SUBSEQUENCE= | Optional inner event window within a broader sequence. |
| /SUBSEQUENCE_EXCLUDE_EVENTS= | This Event subsequence must not be during the sequence requested. |
| /EVENT_SUBSEQUENCE_INSTANCE= | Index of the subsequence instance to evaluate (0 = all, 1 = first, etc.). |
| /EVENT_INSTANCE= | Defines how many event occurrences to consider. |
| FRAME_WINDOW | Size of the frame window to search around each point. |
| THRESHOLD | Threshold value to trigger event detection. |
Dialog
The command can be edited in a text editor or in a dialog form. To edit in the dialog pop up form either click on the Edit button in the pipeline workshop or double-click on the pipeline command. The dialog is shown below.
The dialog box allows you to assign values to the command parameters outlined above.
Notes
Event_Labels are defined by the c3d format. Event_Labels exist only at Motion Capture frames (e.g. at Point Rate). For model based kinematic and kinetic calculations this is fine, because these signals only exist at Motion Capture frames.
For measures of timing that involve signals that are at ANALOG rate (e.g. Force Platform data) the motion capture rate isn't sufficient.
In Version 5 a series of metric commands were introduced to identify the time of a threshold crossing or maximum at the analog rate.