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Chapter 4 Using NI-IMAQdx in LabVIEW
NI-IMAQdx User Manual 4-3 ni.com
Acquisition VIs
Two types of acquisition VIs are available in LabVIEW: high-level and
low-level.
High-Level
Use the high-level acquisition VIs for basic image acquisition applications.
VIs are included for snap, grab, and sequence, as described in the
Acquisition Types section of this chapter.
Low-Level
Use the low-level acquisition VIs for more advanced image acquisition
applications. The low-level VIs configure an acquisition, start an
acquisition, retrieve the acquired images, and stop an acquisition. You
can use these VIs to construct advanced Vision applications.
Complete the following general steps to perform a low-level acquisition.
1. Call IMAQdx Open Camera to initialize the board and create an
IMAQdx Session.
2. Call IMAQdx Configure Acquisition to allocate resources for the
acquisition.
3. Call IMAQdx Start Acquisition to start transferring data from the
camera.
4. Call IMAQdx Get Image to obtain a copy of the requested image data.
5. After an acquisition, call IMAQdx Stop Acquisition to stop
transferring data from the camera.
6. Call IMAQdx Unconfigure Acquisition to release the resources
associated with the acquisition.
7. Call IMAQdx Close Camera to close the camera session.
Note If an acquisition is in progress and you call IMAQdx Close Camera, the driver
automatically stops the acquisition and releases resources associated with the acquisition.