Megapixel revolution in CCTV

IP CCTV technology has developed so far relatively slowly. This was because the recorders with network functions (sometimes often more advanced than some IP cameras), supported by cheap analog cameras were an attractive alternative to IP CCTV systems.

Reduction of analog TV (PAL, NTSC) is the resolution, which is 720 x 576
No such restrictions on IP CCTV systems equipped with megapixel cameras.
The advantages of megapixel cameras can be made assuming that the optimal monitoring of approximately 130 pixels should be recorded every inch of the observed object.

It follows that if the object is 50 meters long, and the system is analogue (720 pixels) that are needed are 9 cameras.

For cameras with 1.3 megapixel (1280 x 1024) just 5, and the camera 2 Mpix – 4 cameras.
A smaller number of cameras has many advantages. First of all, it lowers the cost and time of installation and maintenance.
Also, using fewer cameras are much cheaper.

You can not forget the alternative to the megapixel cameras, which are very popular PTZ cameras. With appropriate optics, it is possible to extend the aforementioned object, even a single camera rotation. However, this approach has many drawbacks. First of all, the camera can only be set in one of two ways.

The first one provides an overall view. Then there is no mention of details such as license plate in car. Second way, using an optical zoom will increase the opportunity to identify the details, but it takes place at the expense of the rest of the image.

In addition, PTZ cameras require the operator, who must decide what is interesting and focus on that area. In the case of stationary megapixel camera, always include the fixed area, making sure all events are recorded, and the increase can be made using the digital zoom.