There are various types of security cameras found on the market in the present day and there are various security camera installation methods. The security surveillance system is the system which monitors activities, behavior, or other changing information of people in order to influence, direct, protect or manage them. The security surveillance system has the power of observation from a distance by means of various electronic equipment or to intercept electronically transmitted information such as phone calls or internet traffic. Instead of using simple and relatively low or no technology methods which include postal interception or human intelligence agents.
One system is the closed circuit camera which is commonly known as CCTV. This type of security cameras uses video cameras to transmit a signal to a specific place which is on a limited set of monitors. Closed circuit cameras differ from broadcast television, as the signal is not transmitted openly, though it may employ transmission from point to point, from point to multi-point or from mesh to wireless links. In general, all video cameras fit this definition. Most often this term is applied to security surveillance systems in areas where monitoring is needed such as military installations, casinos, airports, banks and various convenience stores.
Another type of digital video camera which is commonly employed for surveillance is Internet protocol camera or commonly known as IP camera systems. Unlike the closed circuit television cameras, these cameras can send and receive data via the internet or a computer network. There are two kinds of IP cameras, the centralized IP camera which requires a centralized network video recorder to handle alarm management, video and recording and the other is the decentralized IP camera which has built in recording functions and thus can record directly to local storage media, like hard disk drives, flash drives or to standard network storage attachment.
A more modern type of security camera is mainly wireless camera. These are the closed circuit television cameras which transmit an audio and video signal to a receiver through a radio band. Many wireless cameras require at least one wire or cable for power, while the transmission of audio or video requires no wiring to the wireless devices. Some of the wireless cameras are powered by battery making the cameras totally wireless from top to bottom. Due to these various types of cameras and various mechanisms of operating, security camera installation methods vary from one to another.
