Merging VCube, Руководство пользователя

Страница: 282 / 291

Appendices : Glossary Page 282
H
• house sync: Video sync signal generated within the studio and used as a reference for generating and/or
timing other video signals.
I
• IMX: is the Sony implementation of the MXF for the D10 video format.
• interlaced: Short for interlaced scanning. Also called line interlace. A system of video scanning whereby
the odd- and even-numbered lines of a picture are transmitted consecutively as two separate interleaved
fields.
• IRE (Institute of Radio Engineers): Units of measurement dividing the area from the bottom of sync to
peak white level into 140 equal units. One hundred and forty IRE equals 1 volt peak-to-peak. The range of
active video is 100 IRE.
• ITU-R BT.601-2: Formerly known as CCIR 601. An international standard for component digital television
from which was derived SMPTE 125M (was RP-125) and EBU 3246E standards. This International Telecom-
munications Union (ITU) recommendation defines the sampling systems, matrix values, and filter charac-
teristics for both Y, B-Y, R-Y and RGB component digital television.
• ITU-R BT.656 Formerly known as CCIR 656. The physical parallel and serial interconnect scheme for ITU-R
BT.601-2 (CCIR 601). ITU-R BT.656 defines the parallel connector pinouts as well as the blanking, sync, and
multiplexing schemes used in both parallel and serial interfaces. Reflects definitions in EBU Tech 3267 (for
625 line signals) and in SMPTE 125M (parallel 525) and SMPTE 259M (serial 525).
J
• jog, jogging: Process of moving the video forward or backward one field or frame at a time. Also refers to
the use of a jog wheel to move the picture slowly backwards and forwards.
K
L
• LAN: Local area network.
• Layer: A single video image that is processed so that it can be inserted into the final composite image.
There may be other Layers in the image, and they can be prioritized as to Layer location.
• LTC: Linear TimeCode. TimeCode recorded on a linear analog track on a video tape. It is audible and can
be read at high speeds, but not when the tape is stationary.
• luminance: is the measure of the intensity of the combined color (white) portion of a video signal.
M
• Metadata: is data about data. An example is a library catalog card, which contains data about the nature
and location of a book: It is data about the data in the book referred to by the card.
• • MJPEG is a video codec where each video field is separately compressed into a JPEG image. The resulting
quality is independent from the motion in the image which differs from MPEG video where quality often
decreases when footage contains lots of movement.M-JPEG is best suited for broadcast resolution inter-
laced video (720x486 D1 NTSC or 720x576 PAL). Because it is designed for interlaced video, M-JPEG is not
well suited for movies that are smaller than television resolution. Movies designed to be viewed on pro-
gressive scan computer monitors (like web movies or CD-ROM video games) are ill suited for M-JPEG.
• MPEG: Compression standards for moving images conceived by the Motion Pictures Expert Group, an
international group of industry experts set up to standardize compressed moving pictures and audio. The
moving picture coding systems such as MPEG-1, MPEG-2, and MPEG-4 add an extra step, where the pic-
ture content is predicted from past reconstructed images before coding, and only the differences from the
reconstructed pictures, and any extra information needed to perform the prediction, are coded.
• MXF: is a "container" or "wrapper" format that supports a number of different streams of coded "essence",
encoded with any of a variety of codecs, together with a metadata wrapper which describes the material
contained within the MXF file. MXF has been designed to address a number of problems with non-profes-
sional formats. MXF has full TimeCode and metadata support, and is intended as a platform-agnostic sta-
ble standard for future professional video and audio applications. VCube supports currently OP-Atom (a
very simple and highly constrained layout for simple MXF files) and OP-1a (the layout options for a mini-
mal simple MXF file).