HD VIDEO COMMUNICATION GLOSSARY
HDTV
High definition television, it has a screen ratio of
16:9, approximatly twice the vertical and
horizontal picture resolution. High-definition
television (HDTV) resolution is 1080 or 720 lines.
PIXEL
A pixel is a single point in a graphic image.
INTERLACED SCAN
In a television display, interlaced scan refers to
the process of re-assembling a picture from a
series of video signals. The frame/picture is made
up of two fields: the first field has 262.5 odd lines
(1,3,5...) and the second field has 262.5 even
lines (2,4,6...).
MPEG-4/H.264
H.264, MPEG-4 Part 10 or AVC (Advanced Video
Coding), is a digital video codec standard that is
noted for achieving very high data compression.
It was written by the ITU-T (International
Telecommunication Union) together with the
ISO/IEC Moving Picture Experts Group (MPEG) as
the product of a collective partnership effort
known as the Joint Video Team (JVT).
PROGRESSIVE SCAN
Progressive or non-interlaced scanning is any
method for displaying, storing or transmitting
moving images in which the lines of each frame
are drawn in sequence. This is in contrast to the
interlacing used in traditional television systems.
Advantages: simpler video processing equipment;
higher resolution and fewer artifacts in video with
motion compared to interlaced video of the same
line rate.
RESOLUTION
A measurement of the finest (smallest) detail that
is visible, or can be resolved, in a video image.
The sharpness of a video image, signal or display,
generally described either in terms of "lines of
resolution," or pixels. The resolution you see
depends on two factors: the resolution of your
display and the resolution of the video signal.
WIDESCREEN / 16:9
When used to describe a TV, widescreen generally
refers to an aspect ratio of 16:9, which is the
optimum ratio for
viewing anamorphic DVDs and
HDTV broadcasts.
720P
The number 720 stands for 720 lines of vertical
display resolution, while the letter p stands for
progressive scan or non-interlaced. 720p
assumes a widescreen aspect ratio of 16:9, and a
horizontal resolution of 1280 pixels for a total of
about 0.92 million pixels.
BANDWIDTH
A range of frequencies used to transmit
information such as picture and sound.
BITRATE
Measured as "bits per second," and used to
express the rate at which data is transmitted or
processed. The higher the bit rate, the more data
that is processed and, typically, the higher the
picture resolution.
COMPRESSION
A method of electronically reducing the number of
bits required to store or transmit data within a
specified time or space.
DVI (Digital Visual Interface)
A multi-pin computer-style connection intended
to carry high-resolution video signals from video
source components such as flat panel LCD
computer displays and digital projectors.
FIELD
In interlaced-scan video, each complete frame is
split into 2 sequential fields, each of which
contains half the scanning lines of the frame. One
field contains the odd scanning lines, and the
other field the even lines.
FRAME RATE
The rate at which frames are displayed. The
frame rate for movies on film is 24 frames per
second (24 fps). In regular NTSC video, the frame
rate is 30 fps.
HDMI™
High-Definition Multimedia Interface, similar to
DVI (but using much smaller connectors), the
multi-pin HDMI interface transfers uncompressed
digital video with HDCP copy protection and
multichannel audio. Using an adapter, HDMI is
backward-compatible with most current DVI
connections.
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