Matrox Electronic Systems Matrox RT.X2 - Manual (Page 210)

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Appendix D, Matrox RT.X2 Glossary
source through each frame, converting the
optical images to an electronic signal that is
then recorded to video tape.
temporal redundancy reduction See
inter-frame compression.
texture mapping A display technique
where bitmaps (textures) are placed (mapped)
onto 3D surfaces to make objects look more
realistic.
time base corrector (TBC) An
electronic device that, when connected to the
output of a VTR, corrects the stability and
timing of the VTR’s playback video. This is
achieved by stripping the unstable horizontal
and vertical sync pulses from the video signal,
and replacing them with new, clean sync
pulses.
time code A sequential code number
assigned to successive video frames on tape.
Each frame has its own time code, which is
electronically encoded on the tape in the form
hours:minutes:seconds:frames. See also drop-
frame time code, LTC, and VITC.
timeline The graphical representation
(normally a horizontal line) of a video
sequence. It is usually divided into
hours:minutes:seconds:frames, and is used to
position video, audio, graphics, and video
effects that make up the sequence.
tonal range The range of light and dark
areas in an image. Tonal range can be divided
into three different areas: shadows, midtones,
and highlights. Shadows are the darkest areas
of an image, highlights are the lightest areas,
and midtones are the areas with tones
between the lightest and darkest areas.
track matte effect A Matrox effect that
lets you superimpose one clip onto another
using an animated matte, sometimes called a
traveling matte, to determine how the two
clips are composited (keyed).
transform settings Settings that let you
change the position, size, and rotation of a
clip in the Matrox realtime plug-in. Transform
settings can be applied on the x, y, and z axes
of a clip.
traveling matte effect See track matte
effect.
twirl effect A Matrox effect that lets you
create twirl patterns that twist and rotate your
video and graphics clips into spirals, coils, or
whirlpools.
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