Matrox Electronic Systems Matrox RT.X2 User Manual download pdf (Page 210)

202

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

1 2 ... 205 206 207 208 209 210 211 212 213 214 215 ... 223 224

Comments to this Manuals

No comments