DigitalVideoAndHDTVAlgorithmsAndInterfaces.pdf

VHS Video Home System: A consumer analog videocassette system,
invented by JVC, to record 480i or 576i using the color-under
method on 1 ⁄2-inch tape.
VHS-C VHS, Compact: A consumer analog videocassette system identical
to VHS but with a smaller cassette.
Video-8 A consumer analog videocassette system using 8 mm tape; also
known as 8 mm. Its successor is Hi8.
VITC Vertical interval timecode: Timecode data encoded in an analog
representation and conveyed in the VBI.
VITS Vertical interval test signal. One or a few lines of analog test
signals conveyed in the VBI.
VSB Vestigial sideband: An RF modulation system. Analog VSB is used
in the NTSC and PAL standards for terrestrial television. A form of
digital VSB (8-VSB) is used in the ATSC standard for terrestrial
digital television.
VTR Videotape recorder. Implies professional: T for tape is used even if
the tape medium is encased in a cassette.
Weave 1. In film, erratic side-to-side motion of the image owing to
imperfect registration of the sprocket holes to the film gate.
2. In PC graphics, a deinterlacing technique that merges fields
together irrespective of interfield motion.
White See Reference white, on page 643.
Y 1. In physics and color science, and when used carefully in video
and computer graphics, the symbol for (linear-light) luminance,
the CIE Y tristimulus component. See Luminance (1) on page 636.
2. In video, in digital image processing, and in computer graphics,
the symbol Y is often carelessly used to denote luma (properly Y’);
see below.
Y’ In video, the symbol for luma: The sum of nonlinear (gammacorrected)
red, green, and blue primary components, each
weighted by its luma coefficient. See Luma, on page 636. Distinguished
from luminance, Y, which can be formed as a weighted
sum of linear-light (tristimulus) red, green, and blue primary
components. Historically, the Y symbol in video was primed (Y’),
but the prime is often carelessly elided in modern times, leading
to widespread confusion with luminance.
Y’/C,
Y’/C3.58,
Y’/C4.43
Analog luma, Y’ (not luminance), accompanied by a modulated
chroma signal, C, quadrature modulated at approximately the
subcarrier frequency indicated in megahertz. Preferably denoted
S-video; S-video-525 (or in Japan, S-video-525-J); and
S-video-625; respectively. May have stable or unstable timebase;
may have coherent or incoherent color subcarrier.
GLOSSARY OF VIDEO SIGNAL TERMS 651