Bedienungsanleitung Axis 207 network camera 10 pack (Seite 49 von 54) (Englisch)

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AXIS 207 - Glossary of Terms

Motion JPEG - Motion JPEG is a simple

compression/decompression technique for networked 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.

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 - MPEG-2 is 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.

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 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.

NTSC (National Television System Committee) - NTSC is

the television 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 companies that manufacture equipment

which is then marketed and sold to other companies under

their own names.

PAL (Phase Alternating Line) - PAL is the dominant

television standard in Europe. PAL delivers 625 lines at 50

half-frames/second.

PEM (Privacy Enhanced Mail) - An early standard for

securing electronic mail. The PEM-format is often used for

representing an HTTPS certificate or certificate request.

Ping - Ping is a basic network program used diagnostically

to check the status of a network host or device. Ping can be

used to see if a 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 - A pixel is one of the many tiny dots that make up a

digital image. The colour and intensity of each pixel

represents a tiny area of the complete image.

PoE (Power over Ethernet) - Power over Ethernet provides

power to a network device via the same cable as used for the

network connection. This is very useful for IP-Surveillance

and remote monitoring applications in places where it may

be too impractical or expensive to power the device from a

power outlet.

PPP (Point-to-Point Protocol) - A protocol that uses a

serial interface for communication between two network

devices. For example, a PC connected by a phone line to a

server.

PPTP (Point-to-Point Tunnelling Protocol) - A protocol

(set of communication rules) that allows corporations to

extend their own corporate network through private

"tunnels" over the public Internet. In this way a corporation

can effectively use a WAN (Wide Area Network) as a large

single LAN (Local Area Network). This kind of

interconnection is known as a virtual private network

(VPN).

Pre/post alarm images - The images from immediately

before and after an alarm. These images are stored in a

buffer for later retrieval.

Progressive scan - Progressive scan, as opposed to

interlaced video, scans the entire picture, line by line every

sixteenth of a second. In other words, captured images are

not split into separate fields as in interlaced scanning.

Computer monitors do not need interlace to show the

picture on the screen, but instead show them progressively,

on one line at a time in perfect order, i.e. 1, 2, 3, 4, 5, 6, 7

etc., so there is virtually no "flickering" effect. In a

surveillance application, this can be critical when viewing

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 communicate. Protocols are found at many levels of

communication, and there are hardware protocols and

software protocols.

Proxy server - In an organisation that uses the Internet, a

Axis 207 network camera 10 pack Seite 49

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