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Chapter 4 Programming with NI-IMAQ for 1394 VIs
NI-IMAQ for IEEE-1394 Cameras User Manual 4-8 ni.com
4. Call IMAQ1394 Get Image.
5. After an acquisition, release the resources associated with the
acquisition using IMAQ1394 Close. IMAQ1394 Close also stops the
acquisition if one is in progress. If you want to stop the acquisition
without releasing the resources (such as the image buffers), use
IMAQ1394 Stop Acquisition.
Examples of the low-level acquisition VIs are included in
examples/imaq/IMAQ1394examples.llb
.
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
anitemonanassemblyline.
Timeout specifies the amount of time (in milliseconds) to wait for the
trigger. Figure 4-7 shows how to use IMAQ1394 Configure Trigger to
perform a snap acquisition based on a trigger.
Figure 4-7. IMAQ Triggering
Image Display
Many image acquisition applications require that one or more images
be displayed. You have three options for displaying images in LabVIEW.
If you have IMAQ Vision for LabVIEW, the image processing and analysis
software for LabVIEW, you can use IMAQ WindDraw. IMAQ WindDraw
Motion and Vision»Vision Utilities»Display displays an image in an
image window. Figure 4-8 illustrates using IMAQ WindDraw to display