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What is the difference between Megapixels and the Technology of CCTV

 

If you have been searching for CCTV you will notice most CCTV is moving towards High Definition HD for Video Monitoring and Surveillance Recording.

Currently there is a mixture of Technologies available on the market, these are mainly Analogue High Definition (AHD or CVI) and IP Technology (Network based Technology).  You will notice resolutions vary from D1/960H(less than 0.4Megapixels) to some cameras promoting in excess of 8 Megapixels.  Technology is improving quickly where we will see cameras promoting in excess of 10 Megapixels and smarts in the cameras like line crossing technology and facial and number plate recognition.

 

 

What's the resolution?

In conventional analog technology, Television line (TVL) is the the main specification for analog camera. It indicates how many effective pixels the camera can deliver.

PAL: 700 TVL = 976(Horizontal) x 582(Vertical) = Approx. 570K pixels
Analog technology has been dominated the video broadcasting and surveillance fields for many years. Since the rapid development, analog technology is evolving into digital technology which can offer high definition resolution. Almost IP cameras can deliver megapixel resolution.

 

Comparison between 1.3MP, 2MP, 3MP and 5MP

 

NameWidth (Vertical Pixels)Height (Horizontal Pixels)Total(Pixels)
1MP/720P1280720921,600
QVGA/960P12809601228,800
1.3MP128010241310,720
2MP/1080P192010802073,600
2.3MP192012002304,000
3MP204815363145,728
5MP256019204915,200
6MP303220086088,256
8MP326424487990,272

Note: 6 megapixel and 8 megapixel IP cameras are available however cost is high and not mainstream

Comparison between 960P, 2.3MP, 3MP resolution

Resolution is one of important specifications for your IP cameras. Higher resolution means more image detail, but this doesn't mean it can provide you excellent surveillance solution. Different from traditional digital camera, the IP cameras rely on network for video streaming, which means it will occupy the high network bandwidth. Typically, 2 megapixel IP cameras deliver 1080P resolution at 3fps, and the bit-rate/network bandwidth requires 4Mbps.


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