CCTV and Recording System

Closed Circuit Television, also known by the acronym CCTV. CCTV is a visual surveillance technology designed for monitoring a variety of environments and activities all at the same time. CCTV systems typically involve a dedicated communications link between cameras in the field and monitors at one or more control centres. Systems can be made up of technically mature analog cameras and image storage devices, or newly developed digital cameras and image storage devices, or a mix of the two technologies.

Fixed monitoring Cameras



A CCTV system usually involves a linked system of cameras able to be viewed and operated from a series of control rooms and/or a central point of operation. Cameras come in many configurations, but can be classified under two general categories; stationary and moving. Stationary cameras are pointed at a specific scene of interest, such as a hallway, and broadcast that one scene to the control site 100% of the time. Stationary cameras can be adjusted to compensate for the specific lighting conditions of that scene. Stationary cameras can be fully exposed, or contained within a large variety of enclosures designed to meet the specific requirements of that site, such as discreteness or vandal resistance.

Moving Monitoring Camera



Moving cameras, commonly called PTZ (for pan, tilt, zoom) allow a system operator to move the camera by remote control to follow an object of interest, such as a person or a car, over a large area of interest. This is typically done by use of a joystick in the control center that provides side to side (pan), up and down (tilt) and zoom control. PTZ devices can also be programmed to move in user-defined PTZ sequences to provide general surveillance of areas of interest. PTZ devices can be further programmed to automatically move to areas of interest, such as when a door or gate opens, or when motion is detected. Because the camera can be aimed at scenes with different lighting conditions, these cameras typically have many automated adjustments, such as auto focus and auto iris to keep the image optimized for accurate viewing

Digital Video Recorder (DVR)



Digital storage systems have the advantage of being able quickly search though large amounts of video, based on an event, time of day, or camera. In addition, the amount of storage may be optimized with the ability to program the record rate for each camera, the most critical cameras having the most recorded video.