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AXIS 241Q/241S - Glossary
Video camera - See Network camera and CCTV video camera.
Video decoder - A network video decoder converts digital video streams back into analog signals, which can then be
displayed on standard TV sets, analog monitors and video switches.
Video encoder (video server) - A video encoder/server digitizes analog video signals and sends digital images directly over
an IP network, such as a LAN, intranet or the Internet. In effect, it turns an analog video system into a network video system
and enables users to view live images using a web browser or application software on any local or remote computer on a
network.
Video management software - Video management software supplies the means for monitoring, analyzing and recording
network video. In its simplest form, it offers live viewing, storage and retrieval of video sequences. Advanced applications
may also provide support for recording of live video from multiple devices, different recording modes, search functions,
remote access via a web browser, control of PTZ devices, etc.
VMD (Video Motion Detection) - Video Motion detection defines activity (motion) in a monitored scene by analyzing image
data and differences in series of images. This detection can, for example, be used to trigger an alarm event in a network
camera and start the upload of images from the camera.
Video switcher - An analog video switcher sequentially displays full screen images, from one camera after another, typically
at 3-5 seconds intervals. Other camera sources are not recorded while the image source from one camera is displayed on
screen.
VOP (Video Object Plane) - A VOP is an image frame in an MPEG-4 video stream. There are several types of VOP:
- An I-VOP is a complete image frame.
- An P-VOP codes the differences between images, as long as it is more efficient to do so. Otherwise it codes the whole
image, which may also be a completely new image.
WAN (Wide-Area-Network) - Similar to a LAN, but on a larger geographical scale.
Web camera (Webcam) - A camera that requires a constant connection (via e.g. USB) to a PC for its operation. See also
Network camera.
Web server - A program that allows web browsers to retrieve files from computers connected to the Internet. The Web server
listens for requests from browsers and upon receiving a request for a file sends it back to the browser. The primary function
of a Web server is to serve pages to other remote computers.
Zoom lens - A zoom lens can be moved (zoomed) to enlarge the view of an object to show more detail.