Axis M1103 User Manual

Also see for M11 Network Camera Series: User manual User manual User manual Installation guide User manual

45AXIS M11 Series - Glossary of Termsfields (at half height) are then combined into 1 frame.Interlacing was developed many years ago for the analog TVworld and is still used widely today. It provides good resultswhen viewing motion in standard TV pictures, although there isalways some degree of distortion in the image.To view interlaced video on e.g. a computer monitor, the videomust first be de-interlaced, to produce progressive video, whichconsists of complete images, one after the other, at 25 framesper second. See also Progressive scan.IP (Internet Protocol) - The Internet Protocol is a methodtransmitting data over a network. Data to be sent is dividedinto individual and completely independent "packets." Eachcomputer (or host) on the Internet has at least one address thatuniquely identifies it from all others, and each data packetcontains both the sender's address and the receiver's address.The Internet Protocol ensures that the data packets all arrive atthe intended address. As IP is a connectionless protocol, whichmeans that there is no established connection between thecommunication end-points, packets can be sent via differentroutes and do not need to arrive at the destination in thecorrect order.Once the data packets have arrived at the correct destination,another protocol - Transmission Control Protocol (TCP) - putsthem in the right order. See also TCP.IP Address - An IP address is simply an address on an IPnetwork used by a computer/device connected to that network.IP addresses allow all the connected computers/devices to findeach other and to pass data back and forth.To avoid conflicts, each IP address on any given network mustbe unique. An IP address can be assigned as fixed, so that itdoes not change, or it can be assigned dynamically (andautomatically) by DHCP.An IP address consists of four groups (or quads) of decimaldigits separated by periods, e.g. 130.5.5.25. Different parts ofthe address represent different things. Some part will representthe network number or address, and some other part willrepresent the local machine address.See also IP (Internet Protocol).I-VOP - See VOP.JPEG (Joint Photographic Experts Group) - Together withthe GIF file format, JPEG is an image file type commonly usedon the web. A JPEG image is a bitmap, and usually has the filesuffix '.jpg' or “.jpeg.” When creating a JPEG image, it ispossible to configure the level of compression to use. As thelowest compression (i.e. the highest quality) results in thelargest file, there is a trade-off between image quality and filesize.kbit/s (kilobits per second) - A measure of the bit rate, i.e. therate at which bits are passing a given point. See also Bit rate.LAN (Local Area Network) - A LAN is a group of computersand associated devices that typically share common resourceswithin a limited geographical area.Linux - Linux is an open source operating system within theUNIX family. Because of its robustness and availability, Linuxhas won popularity in the open source community and amongcommercial application developers.Local storage - If a camera or video encoder supports localstorage, an SD card can be inserted into the SD card slot tolocally record and store a video stream.MAC address (Media Access Control address) - A MACaddress is a unique identifier associated with a piece ofnetworking equipment, or more specifically, its interface withthe network. For example, the network card in a computer hasits own MAC address.Manual iris - This is the opposite to an autoiris, i.e. the camerairis must be adjusted manually to regulate the amount of lightallowed 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. Commonlyused to give the ‘speed’ of a network. A LAN might run at 10 or100 Mbit/s. See also Bit rate.Monitor - A monitor is very similar to a standard television set,but lacks the electronics to pick up regular television signals.Motion JPEG - Motion JPEG is a simplecompression/decompression technique for networked video.Latency is low and image quality is guaranteed, regardless ofmovement or complexity of the image. Image quality iscontrolled by adjusting the compression level, which in turnprovides control over the file size, and thereby the bit rate.High-quality individual images from the Motion JPEG streamare easily extracted. See also JPEG.Megapixel - See Pixel.MPEG (Moving Picture Experts Group) - The Moving PictureExperts Group develops standards for digital video and audiocompression. It operates under the auspices of theInternational Organization for Standardization (ISO). The MPEGstandards are an evolving series, each designed for a differentpurpose.MPEG-2 - MPEG-2 is the designation for a group of audio andvideo coding standards, and is typically used to encode audioand video for broadcast signals, including digital satellite andCable TV. MPEG-2, with some modifications, is also the codingformat used by standard commercial DVD movies.MPEG-4 - A video compression standard that makes good useof bandwidth, and which can provide DVD-quality videostreams at less than 1 Mbit/s.Multicast - Bandwidth-conserving technology that reducesbandwidth usage by simultaneously delivering a single streamof information to multiple network recipients.Network connectivity - The physical (wired or wireless) andlogical (protocol) connection of a computer network or anindividual device to a network, such as the Internet or a LAN.NTSC (National Television System Committee) - NTSC is thetelevision and video standard in the United States. NTSCdelivers 525 lines at 60 half-frames/second.NWay - A network protocol that automatically negotiates thehighest possible common transmission speed between twodevices.