National Instruments IEEE 1394 User Manual

© National Instruments Corporation

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

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.