Description:
Internet camera also refered as network
camera are analogue or digital video cameras,
plus an embedded video server having an IP address,
capable of streaming the video (and sometimes,
even audio).
Due to the fact that network cameras are embedded
devices, and do not need to output an analogue
signal, resolutions higher than CCTV analogue
cameras are possible. A typical analogue CCTV
camera has a PAL (768x576 pixels) or NTSC (720x480
pixels), whereas network cameras may have VGA
(640x480 pixels), SVGA (800x600 pixels) or quad-VGA
(1280x960 pixels, also referred to as 'megapixel')
resolutions.
An analogue or digital camera connected to a
video server acts as a network camera, but the
image size is restricted to that of the video
standard of the camera.
However, optics (lenses and image sensors), not
video resolution, are the components that determine
the image quality.
Network cameras can be used for very cheap surveillance
solutions (requiring one network camera, some
Ethernet cabling, and one PC), or to replace entire
CCTV installations (cameras become network cameras,
tape recorders become DVRs, and CCTV monitors
become computers with TFT screens and specialised
software. Digital video manufacturers claim that
turning CCTV installations into digital video
installations is inherently better.
|