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Chapter 4 Using NI-IMAQ for IEEE 1394 Cameras in LabVIEW
© National Instruments Corporation 4-7 NI-IMAQ for IEEE 1394 Cameras User Manual
Triggering
Often, you may need to link or coordinate a vision action or function with
events external to the computer, such as receiving a strobe pulse for
lighting or a pulse from an infrared detector that indicates the position of
an item on an assembly line. In these cases, use a triggered image
acquisition.
Figure 4-6 illustrates using the IMAQ1394 Configure Trigger VI to
perform a grab acquisition based on a trigger. Timeout specifies the
amount of time, in milliseconds, to wait for the trigger.
Figure 4-6. IMAQ Triggering
Image Display
Many image acquisition applications require that one or more images
be displayed. You have several options for displaying images in LabVIEW.
You can display an image directly on the front panel using an Image
Display control, which is available on the Vision Controls palette. To
display an image on an Image Display control, place the control on the front
panel of your VI. On the block diagram, wire Image Out from an
acquisition VI to the Image Display control terminal.
Figure 4-7 illustrates using an image control to display an image using an
Image Display control. For more information about Image Display
controls, refer to the IMAQ Vision for LabVIEW VI Reference Help.