Axis M3011 User Manual

Also see for M3011: Datasheet Datasheet Datasheet Installation guide Installation guide

41AXIS M3011 - Glossary of TermsGlossary of TermsActiveX - A standard that enables software components tointeract with one another in a networked environment,regardless of the language(s) used to create them. webbrowsers may come into contact with ActiveX controls, ActiveXdocuments, and ActiveX scripts. ActiveX controls are oftendownloaded and installed automatically as required.Angle - The field of view, relative to a standard lens in a 35mmstill camera, expressed in degrees, e.g. 30°. For practicalpurposes, this is the area that a lens can cover, where the angleof view is determined by the focal length of the lens. Awide-angle lens has a short focal length and covers a widerangle of view than standard or telephoto lenses, which havelonger focal lengths.ARP (Address Resolution Protocol) - This protocol is used toassociate an IP address to a hardware MAC address. A requestis broadcast on the local network to discover the MAC addressfor an IP address.ARTPEC (Axis Real Time Picture Encoder) - This chip is usedfor image compression, and image processing such asconversion of raw image sensor data, color correction,sharpening, noise filtering etc.ASIC (Application Specific Integrated Circuit) - A circuitdesigned for a specific application, as opposed to a generalpurpose circuit, such as a microprocessor.Aspect ratio - A ratio of width to height in images. A commonaspect ratio used for television screens and computer monitorsis 4:3. High-definition television (HDTV) uses an aspect ratio of9:16.Autoiris (DC-Iris) - This special type of iris is electricallycontrolled by the camera, to automatically regulate the amountof light allowed to enter.Bitmap - A bitmap is a data file representing a rectangular gridof 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.’ GIFs and JPEGs are examples of image file typesthat contain bitmaps.Because a bitmap uses this fixed raster method, it cannot easilybe rescaled without losing definition. Conversely, a vectorgraphic 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 toas speed, but actually defines the number of bits/time unit andnot distance/time unit.Bonjour - Also known as zero-configuration networking,Bonjour enables devices to automatically discover each otheron a network, without having to enter IP addresses or configureDNS servers. Bonjour is a trademark of Apple Computer, Inc.Broadband - In network engineering terms, this describestransmission methods where two or more signals share thesame carrier. In more popular terminology, broadband is takento mean high-speed data transmission.CCD (Charged Coupled Device) - This light-sensitive imagedevice used in many digital cameras is a large integrated circuitthat contains hundreds of thousands of photo-sites (pixels)that convert light energy into electronic signals. Its size ismeasured diagonally and can be 1/4", 1/3", 1/2" or 2/3".CGI (Common Gateway Interface) - A specification forcommunication between a web server and other (CGI)programs. For example, a HTML page that contains a formmight use a CGI program to process the form data once it issubmitted.CIF (Common Intermediate Format) - CIF refers to the analogvideo resolutions 352x288 pixels (PAL) and 352x240 pixels(NTSC). See also Resolution.Client/Server - Client/server describes the relationshipbetween two computer programs in which one program, theclient, makes a service request from another program, theserver, which fulfils the request. Typically, multiple clientprograms share the services of a common server program. Aweb browser is a client program that requests services (thesending of web pages or files) from a web server.CMOS (Complementary Metal Oxide Semiconductor) - ACMOS is a widely used type of semiconductor that uses bothnegative and positive circuits. Since only one of the circuittypes is on at any given time, CMOS chips require less powerthan chips using just one type of transistor. CMOS imagesensors also allow processing circuits to be included on thesame chip, an advantage not possible with CCD sensors, whichare also much more expensive to produce.Codec - In communications engineering, a codec is usually acoder/decoder. Codecs are used in integrated circuits or chipsthat convert e.g. analog video signals into a digital format fortransmission. The codec also converts received digital signalsback into analog format. A codec uses analog-to-digitalconversion and digital-to-analog conversion in the same chip.Codec can also mean compression/decompression, in whichcase it is generally taken to mean an algorithm or computerprogram for reducing the size of large files and programs.Compression - See Image compression.DC-Iris (Autoiris) - This special type of iris is electricallycontrolled by the camera, to automatically regulate the amountof light allowed to enter.DHCP (Dynamic Host Configuration Protocol) - DHCP is aprotocol that lets network administrators automate andcentrally manage the assignment of Internet Protocol (IP)addresses to network devices in a network.DHCP uses the concept of a ‘lease’ or amount of time that agiven IP address will be valid for a computer. The lease time canvary, depending on how long a user is likely to require thenetwork connection at a particular location.DHCP also supports static addresses for e.g. computers runningweb servers, which need a permanent IP address.