CCTV and monitoring can be key to businesses and private sites for maintaining assets. Quality of recorded images can be adjusted based on clients requirements.
Most new installations are going ‘IP’ rather than analogue. IP cameras use a lLocal Area Network (LAN) and Broadband connection, with recording being carried out on a Network Video Recorder (NVR) on site.
Many products are ‘Internet based’ for remote connectivity, however in the past this could reduce the remote picture quality whilst maintaining local picture integrity. With the new NVR systems picture quality is maintained.
Many handheld devices, Tablets, Smartphones can now monitor the video flow:
CCTV camera design criteria
As part of the CCTV planning process it is key to get the correct camera for the area(s) that are needing to be viewed. Below is a lens calculator for helping with this design process, giving viewing angles and focal distance.
The majority of the CCD’s used in the CCTV industry are 1/3 inch. For capturing the detail of say a car number plate the table below gives so examples.
1. Fixed lens size are lowest cost point,
2. If you are not sure what lens size should be then a vari-focal can be installed and setup at installation time.
3. If even more flexibility is needed then a motorised zoom lens can be installed, say from 2.8 to 12mm
4. Where a client needs a number of areas covered, then a Pan Tilt Zoom (PTZ) can be recommended.
Consideration should also be given to ‘night vision’. This is when the camera goes from full colour to ‘black and white’ with Infrared (IR) illumination. Depending on the range needed cameras can ‘flood IR’ from a few meters to many, typical distance being 20m.
