18th May 2009
What is a P-Iris?
Note: IP camera lens technology has moved on since the publication of this article. However, P-Iris lenses remain in use.
P-iris is an automa…
3rd Apr 2009
Using H.264 video compression in IP video surveillance systems
H.264 is an open video compression standard. Uniquely, H.264 is the first compression format to be formed by collaboration between members of both…
15th Jan 2009
Glossary: Complementary Metal Oxide Semiconductor (CMOS) Sensor
A CMOS sensor, when applied to IP surveillance cameras, is a device which converts light energy into electrical voltages which can be read by an IP…
1st Dec 2008
Glossary: JPEG
A JPEG is a way of storing images on a digital device such as IP CCTV cameras, digital cameras and mobile phones. JPEG is a compressed image format…
1st Dec 2008
Glossary: MJPEG
MJPEG is short for Motion-JPEG which is a means of storing video footage from IP cameras and digital camcorders.
An MJPEG Movie consists of m…
24th Oct 2008
Glossary: Tampering Alarm
The Tampering Alarm is an intelligent feature found on IP CCTV cameras which have a strong focus on security, such as tamper/vandal resistant IP ca…
20th Oct 2008
Glossary: Network Video Recorder (NVR)
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Network Video Recorder (NVR) is a digital device which sits on your IP CCTV network to receive live image/video streams and record them d…
30th Sep 2008
Glossary: Power over Ethernet Midspan
When used in conjunction with Power over Ethernet compatible equipment such as an IP CCTV security camera, a midspan is the device used to combine…
30th Sep 2008
Glossary: IP camera ports
Note: NW no longer recommends the use of port forwarding, except in certain specific scenarios where it may be required and where other security mi…
26th Sep 2008
Glossary: Automatic Gain Control (AGC)
In low-light conditions, some IP security cameras use Automatic Gain Control (AGC) to artificially improve their "dynamic range" and produce usable…
17th Sep 2008
Glossary: Progressive Scan
Progressive scan is a technology associated with an IP camera's imaging sensor and is used when transmitting, displaying or storing moving images.…
16th Sep 2008
Glossary: High Power PoE (IEEE802.3at)
Power over Ethernet (PoE) is a technology which allows IP cameras to be powered using the same standard Ethernet cable which carries the data conne…