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Professional Fiber Optics Course in Mangla
CCTV (closed-circuit television) is a TV system in which signals are not publicly distributed but are monitored, primarily for surveillance and security purposes.
CCTV relies on strategic placement of cameras, and observation of the camera's input on monitors somewhere. Because the cameras communicate with monitors and/or video recorders across private coaxial cable runs or wireless communication links, they gain the designation "closed-circuit" to indicate that access to their content is limited by design only to those able to see it.
Closed-circuit television (CCTV), also known as video surveillance, is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors. It differs from broadcast television in that the signal is not openly transmitted, though it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. Even though almost all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require additional security or ongoing monitoring. (Videotelephony is seldom called "CCTV" )
Surveillance of the public using CCTV is common in many areas around the world. In recent years, the use of body worn video cameras has been introduced as a new form of surveillance, often used in law enforcement, with cameras located on a police officer's chest or head. Video surveillance has generated significant debate about balancing its use with individuals' right to privacy even when in public.
In industrial plants, CCTV equipment may be used to observe parts of a process from a central control room. For example, when the environment is not suitable for humans. CCTV systems may operate continuously or only as required to monitor a particular event. A more advanced form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, with a variety of quality and performance options and extra features (such as motion detection and email alerts). More recently, decentralized IP cameras, perhaps equipped with megapixel sensors, support recording directly to network-attached storage devices, or internal flash for completely stand-alone operation.
Maintaining perimeter security in medium- to high-secure areas and installations.
Observing behavior of incarcerated inmates and potentially dangerous patients in medical facilities.
Overseeing locations that would be hazardous to a human, for example, highly radioactive or toxic industrial environments.
Building and grounds security.
Obtaining a visual record of activities in situations where it is necessary to maintain proper security or access controls (for example, in a diamond cutting or sorting operation; in banks, casinos, or airports).
(Closed Circuit TV) A self-contained surveillance system comprising cameras, recorders and displays for monitoring activities in a store or company. Earlier analog CCTV systems used VHS tape; either a single VCR for each camera, a "quad VCR" that recorded four low-res images or a time-lapse recorder that handled multiple cameras. Subsequently, specialized digital video recorders (DVRs) with multiple analog inputs superseded VHS tape machines
The main function of a CCTV camera is to capture light and convert it into a video signal. At the core of a CCTV camera is a CCD sensor (Charge Coupled Device). This converts light into an electrical signal. Signal processing converts the electrical signal to a video signal that can be displayed on screen or recorded.
The CCD is made up of optical detector integrated circuits that use semiconductors. The camera lens focuses light on the CCD image sensor. Photo diodes sense the image areas of light and dark and this results in an electrical charge in proportion to the level of light. A brighter area will result in a higher charge. The photo diodes form a matrix of rows and columns and are called picture cells or Pixels. The charge on the diodes are then processed.
you’re building a CCTV camera system, you have two camera options: Internet Protocol (IP) or analog. Due to its compatibility with most applications, IP is the preferred choice for modern capabilities. It’s advised to choose an analog camera if you have a legacy digital recording system with older technology.
Whether you choose wired or wireless CCTV cameras, both are suitable for most applications. Operating via PoE, wired is best for larger properties as the system facilitates multiple devices running on larger properties without taxing your network.
Consider wireless versions for more temporary or smaller spaces not requiring several cameras and extended coverage. This network is also convenient due to the absence of drilling holes or cumbersome wires. If your space is a temporary or leased property, these cameras can be easily removed and uninstalled without major interference and alterations
Conducting impartial, practitioner-relevant, operationally oriented assessments and
validations of emergency responder equipment; and
• Providing information, in the form of knowledge products, that enables
decision-makers and responders to better select, procure, use, and maintain emergency
Information provided by the SAVER Program will be shared nationally with the responder
community, providing a life- and cost-saving asset to DHS, as well as to Federal, state, and local
Professional Fiber Optics Course in Mangla