CCTV Digital Cameras

A Digital or IP (Internet Protocol) cameras is a type of digital video camera which unlike analog CCTV Cameras, can send and receive data via a computer network and the internet.  Although most cameras that do this are webcams, the term "IP Camera" is usually applied only for surveillance.

IP or Digital camera presents a number of obvious advantages over analog cameras.  IP cameras have a higher resolution of at least 640 x 480 can can provide multi-megapixel resolution and HDTV image quality at 30 frames per second.  As they are linked over a Local Area Network (LAN), they can be moved anywhere on the network (including wireless network).

Some IP Cameras are equipped with built-in microphone and speaker, enabling two-way audio communication via a single network cable.  This enable users to communicate with what they are seeing e.g. a parent talking with the children remotely.

However IP Cameras are costlier than analog cameras.  They consume more bandwidth.   A typical IP Camera with a resolution of 640 x 480 at 10 frames per second in MJPEG mode requires about 3 MBit/s.  And they may be more prone to hacking.

When Should We Use IP Cameras?

Studies suggests that for systems with less than 16 camera, analog system is cheaper.  For system that require 16 - 32, they are equal.  Beyond 32, IP-based systems are more cost effective. 

If your application require you to capture high resolution image for future detection and identification analysis such as monitoring of crowded train stations and road junctions, then an IP Camera with Megapixel capability would be the preferred solution.