User`s guide

6 Working with Acquired Image Data
Retrieving Timing Information
In this section.. .
“Introduction” on page 6-20
“Determining When a Trigger Executed” on page 6-20
“Determining When a Frame Was Acquired” on page 6-21
“Example: Determining the Frame Delay Duration” on page 6-22
Introduction
The following sections describe how the toolbox provides acquisition timing
information, particularly,
• Determining when a trigger executed
• Determining when a particular frame was acquired
To see an example of retrieving timing information, see “Example:
Determining the Frame Delay Du ra tion ” on page 6-22.
Determining When a Trigger Executed
To determine when a trigger executed, check the information returned by
a trigger event in the object’s event log. You can also get access to this
information in a callback function associated with a trigger event. For more
information, see “Retrieving Event Information” o n page 7-7.
As a convenience, the toolbox returns the time of the first trigger execution
in the video input object’s
InitialTriggerTime property. This figure
indicates which trigger is returned in this property when multiple triggers
are configured.
6-20