Closed circuit television (CCTV). Circuit is a technology visual surveillance video designed to monitor a variety of environments and activities.
The circuit closed may be composed of one or more video surveillance cameras connected to one or more monitors of video or television, which reproduce the images captured by the cameras. However, to improve the system, they are usually connected directly or by network link other components such as video or computer.
They are in the place where you want to keep a strict watch. In today’s modern system used cameras can be controlled remotely from a control room, where you can midificar configuration. These types of cameras are called PTZ (stands for pan-tilt-zoom).
Some of these systems include night vision, computer, abandoned object detection, people counting and even motion detection, which makes the system be on alert when something moves in front of the cameras assisted operations. The clarity of the images may be of high quality, it can be transformed from dark to light and vice versa levels. All these features make the use of CCTV has grown dramatically in recent years.
At first they were to deter or detect theft and today, not only used to care for and maintain security in facilities, but also with other specific objectives such as those of medicine, the education or the fight against anti – social events.
In many homes these safety systems are used, but can also develop other functions such as gathering evidence of domestic violence. They are also placed in banks, hotels, casinos, terminals, buses and trains, shopping centers, roads, airports, areas and public facilities, among many other places.
Also in the industrial and mining is used in industrial processes. The large increase in cameras in places of public interest, has forced countries like Spain, to regularize the situation by laws such as the Organic Law on Data Protection. It protects the privacy of the people, prohibiting the hidden cameras, obliged to inform about the existence of video surveillance and protect the privacy of individuals, to use them for security purposes and always with the sense of proportionality.
CCTV video surveillance
Currently, there has been a breakthrough in this technology because such calls dome cameras, because the inverted dome shape having positioner and cameras, that can be remotely movable. This movement can be done through a console or keyboard through which can handle the various options of software installed on it.
Also recorded in a CCTV video surveillance system devices such as infrared lamps, twilight sensors, positioners, telephoto lenses, video analytics and intelligent video , etc. The camera technology now permit according to the models, capture thermal images in total darkness, or images in darkness illuminated with infrared sight is not able to see.
The sensor and its operation
The CCD sensor: One of the most important parts of the video camera is the eye of the camera and it depends on the resolution and quality of the film and also the number of frames per second of video you can capture.
The light enters through the lens of the video camera and this is projected to the CCD sensor. The sensor function is to translate the optical image in electronics , in a sequence of images, frames per second analyzing turn the brightness and color of the image, thus creating the video signal.
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