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AXIS 214 PTZ
JPEG (Joint Photographic Experts Group) - Together with the GIF
file format, JPEG is an image
JPEG image is a bitmap, and usually has the file suffix '.jpg' or
".jpeg." Wh
level of compression to use. As the lowest compression (i.e. the
highest quality) results in the largest file, there is a trade-o
image quality and file size.
kbit/s (kilobits per second) - A measure of the bit rate, i.e. the rate at
w
hich bits are passing a given point. See also Bit rate .
LAN (Local Area Network) - A LAN is a group of computers and
a
ssociated devices tha
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
application developers.
MAC address (Media AccesA MAC address is a
unique id
entifier associated with a piece of networking equipment, or
more specifically
network card in a computer has its own MAC address.
Manual iris - This is the opposite to an autoiris,
m
ust be adjusted manually to regulate the amount o
reach the image sensor.
Mbit/s (Megabits per seconA measure of the bit rate, i.e. the rate
a
t which bits are passing a given point. Commonly used to give the
"speed" of a network.
Bit rate.
Monitor - A monitor is very
la
cks the electronics to pick up
Motion JPEG - Motion JPEG is a simple compression/de
te
chnique for networked video. Latency is low and image quality is
guarant
Image quality is controlled b
in turn provides control ove
High-quality individual image
e
asily extracted. See also JPEG.
Megapixel - See Pi
xel.
MPEG (Moving Picture Ex
perts Group) - The M
Experts Group develops standards for di
compression. It operates under the auspices of the International
Organization for Standardization (ISO). The
evolving series, each designed for a different purpose.
MPEG-2 - MPEG-2 is the designation for a group of audio and
c
oding 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
a
nd related technology. The primary uses for the MPEG-4 standard
are web (streaming media) and CD distribution, conversational
(videophone), and broadca
Most of the features inc M
PEG-4 are left to
developers to decide whether to implement them or not. This means
that there are probably no
MPEG-4 set of standards. To deal with this, the stand
concept of "profiles" and "levels", allowing a sp
capabilities to be de
applications.
Multicast - Bandwidth-conserving technology that re
b
andwidth usage by simultaneously delivering a single stream of
information to multiple ne
Multiplexer - A multiplexer is a high-speed switch that provides
full-scree
n images from up to 16
playback everything that happened on any one camera with no
interference from the other cameras on the system.
Network connectivity - The physical (wired or wireless) and logical
(p
rotocol) connection of a
to a network, such as the Inte
NTSC (National Television SysNTSC is the
televisio
n and video standard in the United States. NTSC delivers 525
lines at 60 half-frames/second.
OEM (Original Equipment Manufacturer) - This is a designation for
compa
nies that manufacture equipment which is then marke
sold to other companies un
PAL (Phase APAL is the dominant television
s
tandard in Europe. PA
PEM (Privacy Enhanced Mail) - An early standard for securing
elec
tronic mail. The PEM-format is often use
HTTPS certificate or certificate
Ping - Ping is
the
status of a network host
particular network address (IP address or host name) is occupied or
not, or if the host at that address is responding normally. Ping can be
run from e.g. the Windows Command prompt or the command line in
UNIX.
Pixel (Picture element) - A pixel is one of the many tiny do
make up
a digital image. The color and intensity of each pixel
represents a tiny area of the complete image.
PoE (Power over Ethernet) - Power over Ethernet provides power to
a n
etwork device via the same c
connection. This is very useful for IP-Surveillance and remote
monitoring applications in place
expensive to power the
PPP (Point-to-Point Protocol) - A protocol
interfa
ce for communicatio
example, a PC connected by a phone line to a server.
PPTP (Point-to-Point Tunnelling Proto
col) - A protocol (set of
communication rules) that allows corporations to extend their own
corporate network through private "tunnels"
In this way a corporation can effectively use a WAN (Wide Area
Network) as a large single LAN (Loca
interconnection is known as a
VPN.
Pre/post alarm images - The images from immediately before and
afte
r an alarm. These images are stored in a buffer for later retrieval.
Progressive sProgressive scan, as opposed to interlaced video,
sc
ans the entire pi
other words, captured images are
interlaced scanning.
Computer m
s
creen, but instead show them progressively, on one line at a time in
perfect order, i.e. 1, 2, 3, 4, 5, 6, 7, so there
effect. In a surveillance applic
detail within a moving image, such as a person running. A
high-quality monitor is required to get the best from progressive
scan. See also Interlacing.
Protocol - A special set of rules governing how two entities will
comm
unicate. Protocols are found at many levels of commun
and there are hard
Proxy server - In an organization that uses the Internet, a proxy
se
rver acts as an intermediary
Internet. This provides security, administrative control, and a caching
service. Any proxy server associate
a gateway server, effectively separates the organization’s network
from the outside network and the local firewall. It is the firewall
server that protects the network against outside intrusion.
A proxy server receives requests for Internet services (such
as web
page requests) from many users. the proxy serve
server, it looks in its local cache of previously downloaded web page
If it finds the page, it is returned to the user without
request to the Internet. If the is not in the cache, the proxy
server, acting as a client on behalfof the user, uses one of its own IP
addresses to request the page from another server over the Internet.
When the requested page is returned, the proxy server forwards it to
