Cctv.

Close Circuit television System

1. CCTV System. C.Sagevan . JF/BST/F/17/1/0019 University College of Jaffna.

2. What is CCTV…….? Closed Circuit Television (CCTV) 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 , point to multipoint or mesh wireless links. University College of Jaffna.

3. Why Use CCTV…? Reduce Cost and Risk.  Prevent and Deter Crime . Fool-Proof Coverage . Reduce Property Insurance Premiums . Increase Customer's confidence . Easy to implement . Keep Your Employees Honest . Encourage Good Behavior . Prevent Safety Incidents. University College of Jaffna.

4. Elements of CCTV system. Camera Lens Monitor unit DVR / NVR Cable (Coaxial / Ethernet) Storage devices DC power supply (12V) Simple CCTV System University College of Jaffna.

5. Types of CCTV Systems Analog CCTV system Analog security cameras capture an analog video signal and transfer that signal over coax cable to the Digital Video Recorder (DVR). Each camera may be powered by plugging in the power supply right at the camera or by using RG59 Siamese cable which bundles the video and the power cables. Requires an DVR to capture image Digital / IP CCTV system IP stands for Internet Protocol, and basically refers to a digital video camera that can send and receive data via a computer network . Requires a NVR to capture image. University College of Jaffna.

6. CCTV System’s block Diagram University College of Jaffna.

7. CCTV camera types… CCTV cameras are being installed every where for purpose of security and crime prevention and detection. There are many type if CCTV cameras are available for this purpose . Indoor Camera Outdoor camera IR day/Night Camera Dome Camera Bullet Camera Vandal Proof Camera Hidden Camera Pen Tilt Zoom Camera University College of Jaffna.

8. Indoor Camera Indoor camera as its name suggests used for indoor security mechanism. These are suitable for security in homes, schools, offices, hotels etc … University College of Jaffna.

9. Outdoor Camera Outdoor camera is used for outdoor places . They are mostly used for entry and exist points with limited night lighting . These cameras have hard Shell vandal-proof casings. University College of Jaffna.

10. IR Day / Night Camera IR day/night cameras are used for high alert security areas were surveillance needs to happened day and night . These cameras are used by military personal , in parking lots and high security zones . T he cameras are ideal for outdoor surveillance applications University College of Jaffna.

11. Dome Camera. Cameras are installed inside a dark dome and are design in a way that they go unnoticed by visitors. These cameras can be rotated and tilted Manually . Dome cameras are used in public place like railway station , bus terminals , and other areas where there is a huge gathering of people. University College of Jaffna.

12. Bullet Camera Cylindrical Tapered shape, similar to that of a "rifle bullet ." Outdoor use I nstalled inside protective casings, which protect against dust, dirt , rain, hail and other harmful elements Require long distance viewing Fixed or Varifocal lenses. University College of Jaffna.

13. Fish Eye camera The fisheye camera is a single camera which allows you to record everything with a 180 or 360 degree panoramic view. The strength of this camera can reduce the quantity of cameras needed to cover the same surveillance area. University College of Jaffna.

14. PTZ Camera (Pan Tilt Zoom Camera) PTZ stands for Pan Tilt and Zoom. Those are the movements the camera can do when somebody is remotely controlling it by using a computer or joystick . Most movable camera allow the person monitoring it to move the camera from right to left (Pan), up to down (Tilt), and from a tight angle to a wide angle. (close up Zoom) University College of Jaffna.

15. Connecting method of PTZ camera University College of Jaffna.

16. Camera selection If we select the camera, we will consider about these categories Indoor or Outdoor Day / Night Surveillance Lens Selection Camera Form Factor Video Codec Motion Detection POE (Only for IP) / Power source Wireless Viewing University College of Jaffna.

17. Types of CCTV Lens There are 2 types of lenses: Fixed Fixed lens are those lenses Where lens size doesn’t change, all we can do is focus, we cant zoom in or zoom out Common sizes are 12mm, 08mm, 06mm, 04mm, 3.6mm, 2.8mm, Varifocal In Varifocal lens size can be changed during the installation process & Zoom in and Zoom out is possible. Common Sizes available are 2.5mm~8mm, 3.0mm~12mm, 5.0mm~50mm University College of Jaffna.

18. Focal length Adjustment of lens Focal length can be adjusted by 3 methods: Manual (No Cable) To be used only indoors and where the lighting condition is always the same Auto Iris (With a Cable) Adjusts automatically to allow more or less light to be received by the CCD Chip in the Camera Motor Zoom (With cable and & telemetry receiver is needed) To be found mostly with Pant and Tilt systems, The zoom & Focus can be manually controlled University College of Jaffna.

19. Monitor Unit The function of monitors is to display video images for viewing . The selection of monitors is as important to the quality of the image as the selection of cameras, lenses , and other components in the imaging chain . liquid crystal displays (LCDs) and LED displays , various sizes, and other features . C onsiderations for monitor selection . Pixels Size University College of Jaffna.

20. Video Recorders (DVR/NVR) Video Recorder is at the heart of the CCTV installation. They receive, manage, store and record the video captured by the cameras.  Video Recorders are two types DVR - Digital Video Recorder NVR – Network Video Recorder Not each DVR/NVR is the same. It comes in 4, 8 or 16 channel configurations. Each camera is connected to a channel. So it is important to buy the DVR /NVR with the right number of channels to support all your cameras. DVR / NVRs also vary in terms of recording speeds, compression, storage, and warranty . University College of Jaffna.

21. DVR/NVR back Side ports University College of Jaffna.

22. DVR/NVR back Side ports University College of Jaffna.

23. Cable Coaxial / Ethernet CCTV can be analog or IP based. Depending on that the cables can be C oaxial cable or CAT5/CAT6 (RJ45) cables also known as Ethernet cables. Cables connect the camera with the DVR /NVR. You can also find Siamese CCTV cables. Siamese cables contain an coaxial cable that connects the camera to the DVR and an 18 gauge 2 conductor power cable that supplies power to the camera from the SMPS power supply. Coaxial cable Ethernet cable University College of Jaffna.

24. Cable VGA Cable Video Graphics Array is a standard type of connection for video devices such as  monitors  and projectors . HDMI Cable HDMI  (High-Definition Multimedia Interface ) provides an interface between any audio/video source for transferring uncompressed video data and compressed or uncompressed digital audio data from an  HDMI -compliant source device, VGA cable HDMI cable University College of Jaffna.

25. Cable Connectors BNC Connectors A type of connector  used to connect Coaxial cables. RJ 45 A type of connector used to connect Ethernet cables. RJ 45 University College of Jaffna.

26. Storage devices Hard Disk Drive  or  HDD   need to store the cctv camera footage. It help to review the cctv footage. University College of Jaffna.

27. Applications of CCTV camera Bars Cash rooms Gaming machines Historic sites Holiday Sites Hospitals Number plate recording Public Spaces and other Large Areas Reception areas Retail Schools Shops Football and cricket stadiums Staff theft and fraud Swimming pools Vandalism and theft Car park Vending machines Warehouse CCTV Other uses University College of Jaffna.

28. Thank you…. University College of Jaffna.