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Glossary
© National Instruments Corporation G-3 NI PCI-1405 User Manual
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.
FIFO First-in first-out memory buffer. The first data stored is the first data sent
to the acceptor; FIFOs are used on devices to temporarily store incoming
data until that data can be retrieved.
frame A complete image. In interlaced formats, a frame is composed of two fields.
H
HSI Color encoding scheme using Hue, Saturation, and Intensity information,
where each pixel in the image is encoded using 8 bits for hue, 8 bits for
saturation, and 8 bits for intensity.
HSL Color encoding scheme using Hue, Saturation, and Luma information
where each pixel in the image is encoded using 32 bits: 8 bits for hue, 8 bits
for saturation, 8 bits for luma, and 8 unused bits.
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
Bprimaries. See also RGB.
I
I/O Input/output. The transfer of data to/from a computer system involving
communications channels, operator interface devices, and/or data
acquisition and control interfaces.
instrument driver A set of high-level software functions, such as NI-IMAQ, that control
specific plug-in computer boards. Instrument drivers are available in
several forms, ranging from a function callable from a programming
language to a virtual instrument (VI) in LabVIEW.
intensity The sum of the red, green, and blue primaries divided by three:
(red + green + blue)/3.