Sistemele de televiziune cu circuit inchis
Closed Circuit Television (CCTV) systems
The global use of surveillance systems has grown rapidly over the past ten years due to technological advances, cost reductions and diversity of options. In the times we live, there is no area that does not use or do not need a camera.
From industrial applications that need video to monitor processes, check, compare, and validate quality products, to residential and sports where there is an increasing demand for images to be viewed later; for example, surveillance cameras for security purposes (fire, children, etc.), sports cameras (GoPro, etc.); from video traffic surveillance applications, if video systems automatically detect the registration number and issue evidence of fines or allow access to certain lanes to applications for human trafficking counters, video surveillance systems are part of more and more of the present care surrounds us and they seem to have the future.
The utility of closed circuit television systems
Closed Circuit Television (CCTV) systems allow for real-time monitoring of suspicious events and people, and recording of video for the purpose of later checks.
The possibility of image sequencing and multiplexing proves that CCTV surveillance installations can provide a comprehensive protection solution that requires a larger number of operators.
A well-configured and installed video surveillance system can ensure the identification of suspects, actions taken by them and, where appropriate, these images can become important evidence for the investigative bodies.
Components of closed circuit television systems
The most common component of a closed television system is no doubt. In order to have a functional system in all respects, the system needs special optics, image multiplexing devices (video servers, media converters, multiplexers), recording devices (DVR, NVR, HVRs), viewing devices (performing workstations capable of displaying on multiple monitors simultaneously images captured by camcorders).
Constructively, cameras are designed to be mounted or hidden, indoors or outdoors, fixed or mobile (pan & tilt / speed dome), color or black and white, in visible, infrared or thermal spectra.
Multiplexing and recording devices
Image multiplexing devices can be analog or digital (digital multiplexers or video capture boards). Digital multiplexers also allow the recording of compressed images (mpeg4 / jpeg / h264 / mjpeg, etc.).
Recording devices may be analog (generally bandwidth) or digital (with optical recording).
Analogs of the camcorder in an existing system can be adapted to work in an IP system:
