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Chapter 2 Basic Acquisition with NI-IMAQdx
© National Instruments Corporation 2-11 NI-IMAQdx User Manual
Calling the Configure Grab function opens a session for a grab acquisition.
During acquisition, each successive grab copies the last acquired internal
buffer into a user buffer where you can process the image.
Sequence
A sequence acquires a specified number of internal buffers and then stops.
Figure 2-4 illustrates the typical programming order of a high-level
sequence acquisition.
Figure 2-4. High-Level Sequence Flowchart
Use a sequence in applications where you need to process a series of
consecutive images. Sequence acquisitions are synchronous. If you do
not specify a session, a temporary session is created using
cam0.
Low-Level Function Examples
Use low-level functions for more advanced programming techniques.
In general, low-level functions have more parameters than high-level
functions.
Opens and configures camera
Executes user-specific image processing
Closes the camera session
Acquires a specified number
of buffers and stops
(Loop)
Open
Sequence
User-Specific Functions
Close