CCTV(Closed Circuit TV) uses one or more video cameras to transmit video and sometimes audio images to a monitor,or video recorder. CCTV uses either wireless or wired transmission to send the broadcast from the video cameras to the monitor(s) or recording device. Most CCTV systems are used for surveillance, which can include security monitoring, or safety monitoring.
CCTV systems have become extremely popular over the last few decades as the technology has improved and become more affordable. The majority of CCTV cameras in use today are usually for surveillance and security purposes. CCTV systems can be found in almost every bank, casino, mall, and large department store. In fact, CCTV systems have become so affordable, most stores also have CCTV systems in them for security purposes.
Types of CCTV Cameras
There are many types of CCTV cameras. They can be categorized by the types of images they are able to capture, the amount of frames they can take per minute, the type of connection to the monitor or video recording device, whether they are able to move position, and special functions they can provide.
CCTV cameras generally take both black and white or color video images. In addition, many CCTV cameras even have night vision capabilities that allow a CCTV camera to view and record low light images using special technology like Infa Red Capability
While most CCTV camera systems easily capture 25 frames per second (25fps is considered real time), the amount of video tape or digital storage would be enormous to record every moment of everyday. For most homes, speeds of 8-12 frames per second are more than enough to catch and record a perpetrator committing a crime.
Digital Video Recorders
There are two types of DVRs (Digital Video Recorders). They are either stand-alone devices or hard drives that are connected to a computer system. DVRs work similar to VCRs, but the images they capture from the CCTV camera is digital. The amount of digital images captured on a DVR is determined by a few factors including the frames per second recorded, the amount of cameras hooked up to the DVR device, the resolution that the DVR saves the images at, and the video compression For a common set up, where 4 cameras are shooting at 2mp and at 12 fps and an image resolution of 1080pis being used, each camera running an continual record will typically give you around 20 days recording on a 2 terra bit Hard drive
CCTV Packages can vary from 2 or 4 camera systems for Domestic Properties while 8 up to 16 Camera Systems can be used in Commercial properties