DigitalVideoAndHDTVAlgorithmsAndInterfaces.pdf

Decimation Resampling producing fewer output samples than original
samples. Synonymous with downsampling.
Decoding 1. Generally, converting one or more coded signals into uncompressed
form, reversing a previous encoding operation that was
applied to reduce data rate for transmission or recording.
2. In traditional video usage, taking composite video, such as
NTSC or PAL, performing luma/chroma separation and chroma
demodulation, and producing component video output such as
Y’C BC R or R’G’B’.
3. In modern video usage, taking coded picture information (such
as a JPEG, M-JPEG, or MPEG compressed bitstream) and recovering
uncompressed picture data.
DIF Digital interface standardized for DV bitstreams.
Digital8 Sony’s trademarked term for a component SDTV digital videotape
format for consumer use, utilizing 8 mm tape cassettes and
recording Rec. 601 Y’C B C R signals, based upon either 480i or
576i scanning, compressed using the DV motion-JPEG technique.
Digital Betacam,
Digital-�
Sony’s trademarked term for a component SDTV digital videotape
format for professional use, utilizing 1 ⁄2-inch tape and recording
Rec. 601 Y’C B C R signals, based upon either 480i or 576i scanning,
mildly compressed using M-JPEG to about 90 Mb/s.
Digital-S JVC’s trademarked term for the digital videotape format now
standardized as SMPTE D-9.
Direct color 1. In video, an analog VTR recording technique that records the
composite signal directly, without separately processing luma and
chroma.
2. In computer graphics, particularly the X-window system,
a graphics system in which lookup tables (LUTs) can be altered
under control of the application program. (In X terminology,
truecolor refers to a graphics system that has no LUTs, or LUTs that
cannot be altered under program control.)
Dominant field See Field dominance, on page 629.
Dot crawl A cross-luma artifact that results from a notch filter decoder,
appearing as fine luma detail crawling up a vertical edge in
a picture that contains a saturated color transition.
Downconversion In video, conversion to a scanning standard, usually at the same
frame rate, having substantially lower pixel count (e.g., HDTV to
SDTV).
Downsampling Resampling that produces fewer output samples than the number
of input samples provided.
GLOSSARY OF VIDEO SIGNAL TERMS 625