Image Processing Reference
In-Depth Information
A popular standard for compressing video to a reasonably good
quality at low bit rates. A 2-hour movie compresses to a size that
comfortably fits on a CD-ROM. This is derived from the MPEG-
4 standard with some additional enhancements that make it
noncompliant in some minor respects.
Document Object Models are used to describe the content
structure of a Web page, for example.
Dots per inch
Digital Rights Management seeks to control access to content so
that commercial models can be built.
Digital TV broadcast using DVB standards from the head-end,
up to a satellite, and back down to a consumer's receiving dish
Digital Signal Processors. These are programmable
microprocessors that are optimized for processing audio and
Digital Terrestrial Action Group.
Digital TV broadcasting using DVB standards via the terrestrial
broadcast infrastructure that was originally installed to
distribute analog TV services.
DV is a standard digital video format used in DVCAM and
DVCPro equipment. This is a transfer codec with various
derivative and related siblings and is often used with FireWire.
DV is used at the low end in TV production but at the high end
of semi-pro and amateur cameras. There are variants for higher-
performance professional use. All DV-based codecs yield good-
quality video. The DV codec is very portable across professional
and amateur systems and virtually all desktop-editing systems
support it. You should avoid recompressing it until you are
ready to convert it to a delivery format.
Digital video compressed to transfer at 25 Mbps is called DV25.
The compression is slightly lossy but undetectable to the human
eye. This format is used in distribution systems.
Digital Video transferred at a bit rate of 50 Mbps with such
slight compression as to be almost undetectable with measuring
equipment. This format is used in production systems.
Digital Video Broadcasting. Part of the EBU that standardizes
digital TV systems.
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