Bedienungsanleitung Axis 207 (Seite 46 von 54) (Englisch)

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AXIS 207 - Glossary of Terms

Glossary of Terms

ActiveX - A standard that enables software components to

interact with one another in a networked environment,

regardless of the language(s) used to create them. Web

browsers may come into contact with ActiveX controls,

ActiveX documents, and ActiveX scripts. ActiveX controls

are often downloaded and installed automatically as

required.

AF (Autofocus) - A system by which the camera lens

automatically focuses on a selected part of the subject.

Angle - The field of view, relative to a standard lens in a

35mm still camera, expressed in degrees, e.g. 30°. For

practical purposes, this is the area that a lens can cover,

where the angle of view is determined by the focal length of

the lens. A wide-angle lens has a short focal length and

covers a wider angle of view than standard or telephoto

lenses, which have longer focal lengths.

ARP (Address Resolution Protocol) - This protocol is used

to associate an IP address to a hardware MAC address. A

request is broadcast on the local network to discover the

MAC address for an IP address.

ARTPEC (Axis Real Time Picture Encoder) - This chip is

used for image compression.

ASF (Advanced Systems Format) - The file format used by

Windows Media. Audio and/or Video content compressed

with a wide variety of codecs can be stored in an ASF file

and played back with the Windows Media Player (provided

the appropriate codecs are installed), or they can be

streamed with Windows Media Services.

ASF is an extensible file format designed to store

synchronized multimedia data. It supports data delivery

over a wide variety of networks and protocols while still

proving suitable for local playback.

ASIC (Application Specific Integrated Circuit) - A circuit

designed for a specific application, as opposed to a general

purpose circuit, such as a microprocessor.

Aspect ratio - A ratio of width to height in images. A

common aspect ratio used for television screens and

computer monitors is 4:3. High-definition television (HDTV)

uses an aspect ratio of 9:16.

Autoiris (or DC-Iris) - This special type of iris is electrically

controlled by the camera, to automatically regulate the

amount of light allowed to enter.

AVI (Audio Video Interleave) - A video format that

supports simultaneous playback of audio and video.

Bitmap - A bitmap is a data file representing a rectangular

grid of pixels. It defines a display space and color for each

pixel (or "bit") in the display space. This type of image is

known as a "raster graphic." GIF's and JPEG's are examples

of image file types that contain bitmaps.

Because a bitmap uses this fixed raster method, it cannot

easily be rescaled without losing definition. Conversely, a

vector graphic image uses geometrical shapes to represent

the image, and can thus be quickly rescaled.

Bit rate - The bit rate (in kbit/s or Mbit/s) is often referred

to as speed, but actually defines the number of bits/time

unit and not distance/time unit.

Bluetooth - Bluetooth is an open standard for wireless

transmission of voice and data between mobile devices (PCs,

handheld computers, telephones and printers).

Bonjour - Also known as zero-configuration networking,

Bonjour enables devices to automatically discover each

other on a network, without having to enter IP addresses or

configure DNS servers. Bonjour is a trademark of Apple

Computer, Inc..

Broadband - In network engineering terms, this describes

transmission methods where two or more signals share the

same carrier. In more popular terminology, broadband is

taken to mean high-speed data transmission.

CCD (Charged Coupled Device) - This light-sensitive image

device used in many digital cameras is a large integrated

circuit that contains hundreds of thousands of photo-sites

(pixels) that convert light energy into electronic signals. Its

size is measured diagonally and can be 1/4", 1/3", 1/2" or

2/3".

CGI (Common Gateway Interface) - A specification for

communication between a web server and other (CGI)

programs. For example, a HTML page that contains a form

might use a CGI program to process the form data once it is

submitted.

CIF (Common Intermediate Format) - CIF refers to the

analog video resolutions 352x288 pixels (PAL) and 352x240

pixels (NTSC). See also Resolution.

Client/Server - Client/server describes the relationship

between two computer programs in which one program, the

client, makes a service request from another program, the

server, which fulfils the request. Typically, multiple client

programs share the services of a common server program. A

web browser is a client program that requests services (the

sending of web pages or files) from a web server.

CMOS (Complementary Metal Oxide Semiconductor) - A

CMOS is a widely used type of semiconductor that uses both

negative and positive circuits. Since only one of the circuit

types is on at any given time, CMOS chips require less

power than chips using just one type of transistor. CMOS

image sensors also allow processing circuits to be included

on the same chip, an advantage not possible with CCD

sensors, which are also much more expensive to produce.

Codec - In communications engineering, a codec is usually

a coder/decoder. Codecs are used in integrated circuits or

chips that convert e.g. analog video and audio signals into a

digital format for transmission. The codec also converts

received digital signals back into analog format. A codec

Axis 207 Seite 46

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