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V
VCD Video CD. A standard for storing
video and audio on a CD that provides
slightly better video quality than standard
VHS. Video is compressed using MPEG-1 at
1100 Kbps, and audio is compressed as
MPEG-1, layer II, at 224 Kbps. A VCD can
hold about 60 minutes of material. Video CDs
can play back on most DVD set-top players.
See also SVCD.
vectorscope A device that measures the
phase and amplitude of the color components
of a video signal.
VITC Vertical Interval Time Code. Time
code that is encoded onto the vertical
blanking interval of a video signal. VITC can
be read by a VTR whenever an image is
displayed, but not usually during high-speed
operation. See also LTC.
voice-over Narration added to a video
segment and mixed in louder than the original
background sounds.
W
WAV
An audio data file format developed
by Microsoft and IBM. This format is the
standard for Windows and can be played by
most applications that can support sound.
white balancing A color correction
technique that adjusts the color levels of an
image using white or gray as a color reference
point. White balancing assumes that when a
white object can be made to look white, the
other color levels will also be accurate. White
balancing is used to correct improper color
levels of an image that are due to varying
lighting conditions or incorrect camera
settings. White balancing can be performed
using the Matrox color correction effect, and
is also available as a setting on most cameras.
Appendix D, Matrox Axio Glossary
white level The brightest "legal" level of a
video signal (reference white), which is at 100
IRE. See also black level, super black, and
super white.
wipe A transition in which one image is
gradually replaced by another image that is
revealed in a given pattern. For example, the
second image could be revealed from the top
of the screen downwards until it fills the
entire screen. See also organic wipe.
X
x-y-z coordinate system A 3D
positioning system that includes a third (z)
axis running perpendicular to the horizontal
(x) and vertical (y) axes. The x-y-z coordinate
system is used in computer graphics for
creating models with height, width, and
depth, and for moving models in 3D space.
Y
Y waveform A specialized scope that
displays the luminance (Y) values of a video
signal.
Y/C video See S-Video.
YC waveform A specialized scope that
displays the combined luminance (Y) and
chrominance (C) of a video signal.
Y, Pb, Pr video See Y, R-Y, B-Y video.
Y, R-Y, B-Y video An analog component
video signal comprised of three channels: Y
(luminance), R-Y (red minus luminance), and
B-Y (blue minus luminance). Also called Y,
Pb, Pr video.
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