National Instruments IMAQ PCI-1422, User Manual

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Glossary
© National Instruments Corporation G-5 IMAQ PCI/PXI-1422 User Manual
IEEE Institute of Electrical and Electronics Engineers.
in. Inches.
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.
interlaced A video frame composed of two interleaved fields. The number of lines in
a field are half the number of lines in an interlaced frame.
interrupt A computer signal indicating that the CPU should suspend its current task
to service a designated activity.
interrupt level The relative priority at which a device can interrupt.
IRQ Interrupt request. See interrupt.
K
k Kilo. The standard metric prefix for 1,000, or 10
3
, used with units of
measure such as volts, hertz, and meters.
K Kilo. The prefix for 1,024, or 2
10
, used with B in quantifying data or
computer memory.
kbytes/s A unit for data transfer that means 1,000 or 10
3
bytes/s.
Kword 1,024 words of memory.
L
line count The total number of horizontal lines in the picture.
LSB Least significant bit.
LUT Lookup table. Table containing values used to transform the gray-level
values of an image. For each gray-level value in the image, the
corresponding new value is obtained from the look-up table.