User`s manual

36
AXIS 206 - Glossary
JPEG (Joint Photographic Experts Group) - Together with
the GIF file format, JPEG is an image file type commonly
used on the web. A JPEG image is a bitmap, and usually has
the file suffix '.jpg' or ".jpeg." When creating a JPEG image,
it is possible to configure the level of compression to use. As
the lowest compression (i.e. the highest quality) results in
the largest file, there is a trade-off between image quality
and file size.
kbit/s (kilobits per second) - A measure of the bit rate, i.e.
the rate at which bits are passing a given point. See also Bit
rate.
LAN (Local Area Network) - A LAN is a group of computers
and associated devices that typically share common
resources within a limited geographical area.
Linux - Linux is an open source operating system within
the Unix family. Because of its robustness and availability,
Linux has won popularity in the open source community
and among commercial application developers.
Lux - A standard unit of illumination measurement.
MAC (Media Access Control) address - A MAC address is a
unique identifier associated with a piece of networking
equipment, or more specifically, its interface with the
network. For example, the network card in a computer has
its own MAC address.
Manual iris - This is the opposite of an autoiris, i.e. the
camera iris must be adjusted manually to regulate the
amount of light allowed to reach the image sensor.
Mbit/s (Megabits per second) - A measure of the bit rate,
i.e. the rate at which bits are passing a given point.
Commonly used to give the "speed" of a network. A LAN
might run at 10 or 100 Mbit/s. See also Bit rate.
Monitor - A monitor is very similar to a television set, but
lacks the electronics to pick up regular television signals.
Motion JPEG - Motion JPEG is a simple
compression/decompression technique for network video.
Latency is low and image quality is guaranteed, regardless
of movement or complexity of the image. Image quality is
controlled by adjusting the compression level, which in turn
provides control over the file size, and thereby the bit rate.
High-quality individual images from the Motion JPEG
stream are easily extracted. See also JPEG and GIF.
Megapixel - See Pixel.
MPEG (Moving Picture Experts Group) - The Moving
Picture Experts Group develops standards for digital video
and audio compression. It operates under the auspices of the
International Organization for Standardization (ISO). The
MPEG standards are an evolving series, each designed for a
different purpose.
MPEG-2 - The designation for a group of audio and video
coding standards, and is typically used to encode audio and
video for broadcast signals, including digital satellite and
Cable TV. MPEG-2, with some modifications, is also the
coding format used by standard commercial DVD movies.
MPEG-4 - MPEG-4 is a group of audio and video coding
standards and related technology. The primary uses for the
MPEG-4 standard are web (streaming media) and CD
distribution, conversational (videophone), and broadcast
television.
Multicast - Bandwidth-conserving technology that reduces
bandwidth usage by simultaneously delivering a single
stream of information to multiple network recipients. See
also Unicast.
Multiplexer - A multiplexer is a high-speed switch that
provides full-screen images from up to 16 analog cameras.
Multiplexers can playback everything that happened on any
one camera with no interference from the other cameras on
the system.
Network camera (Network video camera) - A network
camera is a camera and computer combined in one
intelligent unit. It captures and sends live video directly
over an IP network such as a LAN, intranet or the Internet.
Users can view and/or manage the camera using a standard
web browser or application software from any local or
remote computer on a network. The camera allows multiple
authorized viewers from different locations to
simultaneously access images. A network camera is
sometimes known as an IP camera.
Network connectivity - The physical (wired or wireless) and
logical (protocol) connection of a computer network or an
individual device to a network, such as the Internet or a
LAN.
Network video -
Network video (often referred to as
IP-Surveillance for specific applications within security
surveillance and remote monitoring) is a system that gives
users the ability to monitor and record video over an IP
network (LAN/WAN/Internet).
NTSC (National Television System Committee) - NTSC is
an analog color encoding system used in television systems
in Japan, the United States and other parts of the Americas.
NTSC defines the video signal using 525 TV lines per frame,
at a refresh rate equal to 30 frames per second. See also
PAL.
NVR (Network Video Recorder) - A dedicated Network
Video Recorder (NVR) can be used to gather data streams
from remote network cameras and video servers and store
them on a hard disk. An NVR can be a standard networked
PC, or a dedicated video recording hard disk server with its
own software application.
OEM (Original Equipment Manufacturer) - This is a
designation for companies that manufacture equipment that
is then marketed and sold to other companies under their