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Glossary
© National Instruments Corporation G-3 NI-IMAQ for IEEE-1394 Cameras User Manual
driver Software that controls a specific hardware device, such as an IMAQ or
DAQ device.
E
external trigger A voltage pulse from an external source that triggers an event such as
A/D conversion.
F
field For an interlaced video signal, a field is half the number of horizontal lines
needed to represent a frame of video. The first field of a frame contains all
the odd-numbered lines, the second field contains all of the even-numbered
lines.
frame A complete image. In interlacedformats, a frame is composed oftwo fields.
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.
GUI Graphical user interface. An intuitive, easy-to-use means of
communicating information to and from a computer program by means
of graphical screen displays. GUIs can resemble the front panels of
instruments or other objects associated with a computer program.
H
hardware The physical components of a computer system, such as the circuit boards,
plug-in boards, chassis, enclosures, peripherals, and cables.
hue Represents the dominant color of a pixel. The hue function is a continuous
function that covers all the possible colors generated using the R, G, and B
color spectrum. See also RGB.
Hz Hertz. Frequency in units of 1/second.