User guide

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Appendix D, Matrox Axio Glossary
S-Video A component video signal in
which the luminance (Y) and chrominance
(C) information are separate. S-VHS
videocassette recorders use the S-Video
format. Also called Y/C video.
sync A circuit or signal that directs the
electron gun in a camera or TV picture tube to
hold a picture steady on the screen. It also
synchronizes the electronics of other video
equipment.
sync generator An electrical device that
generates sync (timing) signals used to
synchronize video equipment and keep
pictures stable on the screen.
T
TBC See time base corrector.
telecine process A process that transfers
film (negative or positive) to SD or HD video
tape. The telecine process shines a light
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.
Axio Installation and User Guide.book Page 310 Monday, July 14, 2008 8:00 AM