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AXIS 243SA - Glossary
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.