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Chapter 4 Using NI-IMAQ for IEEE 1394 Cameras in LabVIEW
© National Instruments Corporation 4-5 NI-IMAQ for IEEE 1394 Cameras User Manual
IMAQ Dispose, shown in Figure 4-2, frees the memory allocated for the
image buffer. Call this VI only after the image is no longer required for
processing.
Figure 4-2. IMAQ Dispose
Acquisition Types
The following sections describe snap, grab, and sequence acquisitions in
LabVIEW and give examples.
Snap
Use the IMAQ1394 Snap VI for snap applications. Figure 4-3 shows a
simplified block diagram for using IMAQ1394 Snap.
Figure 4-3. Acquiring an Image Using Snap
Grab
Use two VIs—IMAQ1394 Grab Setup and IMAQ1394 Grab Acquire—for
a grab acquisition in LabVIEW. Call IMAQ1394 Grab Setup once to
initialize the acquisition and start capturing the image to an internal
software buffer. You can call IMAQ1394 Grab Acquire multiple times to
copy the image currently stored in the internal buffer to a LabVIEW image
buffer. After the program finishes copying images, call IMAQ1394 Close
once to shut down the acquisition.
Figure 4-4 shows a simplified block diagram for using IMAQ1394 Grab
Setup and IMAQ1394 Grab Acquire.