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AXIS 241QA/AXIS 241SA - 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 address (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.
Most of the features included in MPEG-4 are left to
individual developers to decide whether to implement
them or not. This means that there are probably no
complete implementations of the entire MPEG-4 set of
standards. To deal with this, the standard includes the
concept of "profiles" and "levels", allowing a specific set
of capabilities to be defined in a manner appropriate for a
subset of applications.
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 web browser or application software from any local or
rem
ote 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.