Glossary
G-12
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V
V
Volts.
value
The grayscale intensity of a color pixel computed as the average of the
maximum and minimum red, green, and blue values of that pixel.
VCO
Voltage-controlled oscillator. An oscillator that changes frequency
depending on a control signal. Use VCO in a phase-locked loop to generate
a stable pixel clock.
VI
Virtual Instrument. (1) A combination of hardware and/or software
elements, typically used with a PC, that has the functionality of a classic
stand-alone instrument (2) A LabVIEW software module (VI), which
consists of a front panel user interface and a block diagram program.
video line
A video line consists of a horizontal synchronization signal, back porch,
active pixel region, and a front porch.
VSYNC
Vertical synchronization signal. The synchronization pulse generated at the
beginning of each video field that tells the video monitor when to start a
new field.
W
white reference level
The level that defines what is white for a particular video system.
See also
.
Y
YUV
A representation of a color image used for the coding of NTSC or PAL
video signals. The luma information is called Y, while the chroma
information is represented by two components, U and V representing the
coordinates in a color plane.
