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Glossary
NI-IMAQ for IEEE 1394 Cameras User Manual G-2 ni.com
DLL Dynamic Link Library—A software module in Microsoft Windows
containing executable code and data that can be called or used by Windows
applications or other DLLs; functions and data in a DLL are loaded and
linked at run time when they are referenced by a Windows application or
other DLLs.
driver Software that controls a specific hardware device, such as an IEEE 1394
camera.
E
endianness The convention describing the ordering of bytes in memory or the sequence
in which bytes are transmitted.
external trigger A voltage pulse from an external source that triggers an event such as
A/D conversion.
F
FIFO First-In First-Out—The first data stored in the memory buffer is the first
data sent to the acceptor. FIFOs are used on IMAQ devices to temporarily
store incoming data until that data can be retrieved.
function A set of software instructions executed by a single line of code that may
have input and/or output parameters and returns a value when executed.
G
gamma The nonlinear change in the difference between the video signal’s
brightness level and the voltage level needed to produce that brightness.
grab Performs an acquisition that loops continually on one buffer. You obtain a
copy of the acquisition buffer by grabbing a copy to a separate buffer that
can be used for analysis.
H
hardware abstraction
layer
Separates software API capabilities, such as general acquisition and control
functions, from hardware-specific information.