can i connect my computer with a cctv camera?

Answer
The simplest process is to buy a network IP camera. This is the camera you can connect to your PC network card using RJ45 plug or to your network switch or router.

You can buy any cheap model from AXIS(my first camera was AXIS, I like them very much), Arecont Vision, Panasonic, Sony, Trendnet (cheapest of the list).

Network IP cameras are modern. The only disadvantage - they are more expensive in compare with traditional analogue CCTV cameras.

If you purchased analogue CCTV camera, you can connect it to your PC using 2 ways:
- buy DVR card (old way, i would not go this way)
- buy an ip video server or video encoder l(like AXIS M7001, quite good for its price, see here: http://www.axis.com/products/cam_m7001/ or AXIS 240Q if you need to connect 4 cameras).

To choose a camera with proper lens (lens with different focal length have different angle of view), camera locations as well to choose your compression for HDD you have you can use IP Video System Design Tool from http://www.jvsg.com or special online calculators.

If you need high resolution camera (like 1-4 Megapixel) go for network camera. Also if you need to watch high speed objects, choose a camera with progressive scan.

If you build a network CCTV system you need to run some software on your PC. The list (a little bit outdated) of not too expensive software is on http://www.video-home-surveillance.com . Also you can have a look on forums networkcamerareviews.com or cctvforum.com to see what other people use.

Is it true that 2.3 megapixels are enough for a camera?

No

I herd that even tho you took a picture with a 24 megapixel camera, when you view it on computer you only see 2.3 megapixels? Is it true that 12 megapixel camera is much better choice than 24 megapixel camera?
before anyone else makes the mistake...one megapixel is one million pixels NOT 1000 pixels.....

Answer
no, term misconstrued,

2.3 mp is around 1792 x 1344 pixels. as 18.5 by 14 inches if placed at 96 dpi value
24 by 18 inches for the pixels range of ppi ,
monitors values cabn bet changed in Display properties,
and Monitors vary in actual size ,
along with Graphics card capabilities,

http://windows.microsoft.com/en-ca/windows/getting-best-display-monitor#getting-best-display-monitor=windows-vista
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for 5by7" print quality at 300 dpi / ppi value guesstimate ,
you want 2100 by 1500 pixels which is around 3.2 mp,
but for same image to print at 300 dpi / ppi at 8 by10 inch , is 3000 by 2400 pixel,
that require 7.2 mp minimum,

so the larger you megapixel value is per image range , that being visual or sensor,
the better or clearer or higher print size for clarity is attained,
_____________

1000 across by 1000 down is the One million pixel count for 1 mp, 1000² (square)

MegaPixel calc
http://www.hugge.netg.se/java/MegaPixels.html
MegaPixels calculator
http://web.forret.com/tools/megapixel.asp?width=3000&height=2400
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