National Instruments NI-IMAQ - Manual (Page 13)

Chapter 2 Software Overview
NI-IMAQ for IEEE-1394 Cameras User Manual 2-2 ni.com
High-Level Functions
Use high-level functions to quickly and easily capture images. If you need
more advanced functionality, you can mix high-level functions with
low-level functions.
Snap Functions
Snap functions capture all or a portion of a single frame or field to the user
buffer.
imaq1394SnapImage Performs a single frame
acquisition in an image buffer,
which is allocated using IMAQ
Vision memory management.
imaq1394Snap Performs a single frame
acquisition in a memory buffer,
which is allocated without using
IMAQ Vision memory
management.
Grab Functions
Grab functions start a continuous image acquisition to a user buffer. Any
frame or field can be copied from the grab buffer to another user buffer.
imaq1394SetupGrab Configures and starts a continuous
acquisition.
imaq1394GrabImage Acquires the most current frame
into the specified IMAQ Vision
image buffer. Call this function
only after calling
imaq1394SetupGrab .
imaq1394Grab Acquires the most current frame
into a previously allocated buffer.
Call this function only after calling
imaq1394SetupGrab .