|Closed-circuit television (CCTV) is a popular form of surveillance that uses video cameras to transmit a signal to a specific destination on a limited set of monitors in a closed network. Banks, airports, industrial plants, military installations, and convenience stores commonly use CCTV, which can operate continuously or can be activated to monitor particular events. CCTV is a popular tool not only for security, but also for monitoring the operations of a business or organization.
When choosing CCTV for security or business needs, the key questions are what kind of camera to use, where to store the images and how to monitor and access them. A consultation with green earth can determine the answers to these questions, which depend on many factors including purpose, location and local conditions.
CCTV systems use many different camera types depending on the security needs. Common camera classifications among which customers can choose include:
Hybrid Digital or Full IP Security Cameras
Hybrid cameras are in essence, Analog Transmission cameras that record to digital video recorders (DVR), A great bang-for-buck solution while still offering high quality video recording. IP Security cameras are full digital transmission and recording via IP cameras and record to network video recorders (NVR).
Fixed or Point Tilt and Zoom (PTZ) Security Cameras
Fixed cameras remain in one position. PTZ cameras can be moved left to right, up and down and zoomed in and out via a computer, DVR or PTZ joystick. These cameras often are used in casinos, shopping malls and other public places where it is imperative to access clear identification of moving people and objects.
Indoor or Outdoor Security Cameras
Outdoor cameras are built tough to withstand the elements, while indoor cameras can be more delicate.
Infared Security Cameras
Most cameras today are digital color with infrared LEDs, which films in color by day and in black and white IR by night. Infared cameras provide the best picture in low-light viewing situations.
Vandal Resistant Security Cameras
Depending on the location of the camera, it may be necessary to make it resistant to vandals with a tough exterior. Consider this option for cameras in a vulnerable location.
Day and Night Security Cameras (Low Light Cameras)
Infared cameras usually film in color during the day and then switch to black and white when it becomes dark. A photoelectric sensor detects the darkness and turns on the LEDs and flips the camera to black and white.