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Glossary

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.

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/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.

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National Instruments Printer PCI-1405 User Manual Page 25