Download - Ip Cctv System
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Introduction to CCTV System
• A CCTV system is a television system, which operates on a closed loop basis.
• The main function of the CCTV system is to allow surveillance and remote viewing.
• Usually, it is a part of an overall integrated package. • Through these systems some of the on-going
hazardous processes are being monitored remotely from the control rooms.
• This is the only on line visual communication in the plant.
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Existing CCTV System
• The simple system is a camera connected directly to a monitor by a coaxial cable.
• The camera generally mounted on a fixed platform or movable platform.
• The camera converts the optical signal into electrical signal (composite video signal) and at the TV end the electrical signal reverts into optical (video) signal.
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The above indicates only the main constituents. The actual system may contain a combination of several accessories.
BLOCK DIAGRAM OF EXISTING CCTV
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These are mainly, Plan and Tilt drive unit. Video Switcher. Video distribution amplifier. Protective housing. Cooling Jacket and Vortex Cooler.
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Pan and Tilt drive unit:
• Pan and Tilt drive unit are used for remotely controlling the position of cameras.
• Using limit switches (individual for the P&T), the angular travel can be controlled.
• These limit switches are adjusted in the site in such a way so that the camera can move up to the desired area of observation.
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Video switcher: • In a multi camera system video switching
facility is employed.• The 8 x 1 video switcher accepts eight
different video signals and selects any one at a time.
• The electronic video exchanges are microprocessor based and are user friendly.
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Video distribution amplifier:
• The output from a single camera can be displayed on several monitors.
• The distribution amplifier also compensates for the loss of video due to increased length of cables.
• The unit requires 230VAC power for its operation.
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Protective housing:
• In some cases camera are placed in some rigorous environments where temperature, dust, vibration humidity etc.
• This protective house is chosen in such a way that the camera, lens, power supply unit etc, can be accommodated in the housing.
• The front portion of the housing is made of special glass.
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Cooling Jacket and Vortex Cooler:
• To protect camera from high temperature cooling jacket is used.
• For this type of housing one water inlet and one water outlet are there.
• Vortex cooler enclosure cooling systems is also used.
• Vortex converts compressed air into cool, filtered air without using refrigerants.
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A four-camera system with video switcher
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Lens
• It is fixed in front of the camera and is used to focus the required object.
• The specification of CCTV lens contains parameters like format, focal length, iris control, focus control and voltages in case of zoom lenses.
• The selection of lens mainly depends on the camera size, area of coverage and place of use.
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Multiple Camera System
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Conversion of analog cameras to digital
• For the conversion of Analog cameras to a Digital one a particular device named as DIGITAL VIDEO RECORDER is used.
Digital Video Recorder:
• DVRs were introduced marking the evolution of the second generation of CCTV.
• The beauty of the mechanical device was that it was something anyone could operate.
• The DVR allowed a video to be recorded in higher resolutions than VCRs and eliminated video tapes.
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Video over IP Analogue image to Digital image Transmission process:
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• The NTSC video signals from analog cameras are connected to video capture cards inside the DVR APPLIANCE OR PC.
• The capture cards take the analog signal and digitize it.
• Stored on a hard disk or a multiple disks. • The DVR software then allows the user to
monitor live cameras.• Connect remotely to the main unit via the
network.
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CCTV SUGGESTED SYSTEM
• The proposed system would contain black & white and colour cameras.
• By assigning unique IP addresses to these digital devices on the Ethernet.
• The digital cameras utilize Super Dynamic function to capture natural images.
• In addition, this colour camera can also control external devices.
• The camera is designed for monitoring over a WAN or over the Internet a snap.
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ANY
QUIRIES…?
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ANY QUIRIES…?