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Glossary
© National Instruments Corporation G-5 NI PXI/PCI-1411 User Manual
HSYNC Horizontal synchronization signal. The synchronization pulse signal
produced at the beginning of each video scan line that keeps a video
monitor’s horizontal scan rate in step with the transmission of each new
line.
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.
hue offset Rotates the Hue plane with a specified offset angle. The hue value of a pixel
is defined as an angle in the normal color plane. You can offset this angle
to move the discontinuity point (at 0 modulo 360°) to another angle value.
The range is –180° to +180° with a default of 0°.
Hz Hertz. Frequency in units of 1/second.
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.
IC Integrated circuit.
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.
intensity The sum of the Red, Green, and Blue primaries divided by three:
(Red + Green + Blue)/3.
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.