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Introduction to Digital Surveillance Systems


InfoLevel: BeginnerPresenter: Eli the Computer GuyDate Created: February 11, 2012Length of Class: 95 MinutesTracksDigital SurveillancePrerequisitesNonePurpose of ClassThis class introduces students to the basic concepts that are required to install and implement Digital Surveillance Systems.ChaptersIntroduction (00:00)Types of Systems (06:18)Types of Cameras (39:12)PTZ Cameras (53:32)Networking (01:04:03)Client Expectations (01:10:01)Legal Considerations (01:13:46)Buying Parts (01:16:59)Final Thoughts (01:20:25)Class NotesIntroductionDigital Surveillance systems are very easy to learn, but you have to make sure you plan properly.Types of SystemsAnalog DVR Systems -- Use Siamese Cable to connect cameras.All cameras are directly connected to the system.PC Based Systems are simply PC's with a DVR card installed.DVR Appliances are specially built computers that are cheaper then PC Based systems, but are generally impossible to repair.Video quality will never be better then DVD quality (Which is not actually very good)IP NVR Systems -- Use Ethernet and TCP/IP to Transmit VideoThese systems support very high resolution camerasFPS -- Frames Per Second -- How smooth the video viewing is30 FPS = Real Time, 15 FPS = Perceived Real Time, 7 FPS shows Jerky VideoFPS can be measured: Real Time Viewing and Recorded Video, It can be per card/ system and/ or per ChannelResolutionIP Cameras use standard resolution measurement for any digital camera. Pixels are measuredAnalog cameras are measured by TVL, Television Lines. 600 TVL is the Best, 320 TVL is the lowest quality.Motion RecordingSystems and cameras can be configured so that video is only recorded when there is movementTypes of CamerasBullet -- are self contained and easy to aim.Dome -- are covered with a plexiglas dome so that they cannot be tampered withVandal Proof Dome -- are hardened so that they can be hit with a bat/ hammer and not be damaged.Box -- Are just the camera unit. You then add an appropriate Lens and MountCameras are built to be used inside, or outside.Low Light cameras can see in Low Lux. (Lux is a measurement of light)No Light cameras use Infrared lights to illuminate an area and the camera can see the Infrared light.Wide Dynamic Range Cameras can view in a wide range of lighting conditionsAuto-iris lenses automatically open and close the iris based on lighting conditions.PTZ Cameras -- Pan, Tilt, ZoomNot all PTZ Cameras do everything. Some only Pan, Some only Zoom.Eli HATES Analog PTZ Camera InstallationPTZ Camera is connected to a Controller on the DVR/ NVR. Generally PTZ Cameras are wired in a loop configuration.PTZ Cameras use protocols to communicate. Pelco D and Pelco P are widely used.PTZ Cameras can have built in intelligence so that they can follow movements, or perform a preprogrammed pattern.NetworkingWAN Connection for remote viewing should be a minimum of 2Mbps upload speedMega Pixel Cameras can bog down a LAN.Parallel networks are many times used to separate the Surveillance Network from the Computer Network.Don't use an NVR/DVR for any other service then surveillance.Client ExpectationsClients will think their system will do everything they see in Mission Impossible. Make sure to do a good job on Expectations ManagementLegal ConsiderationsSurveillance systems are regulated by local laws. In Maryland taping Video is easy, but taping audio can run into legal issues. Talk to a lawyer!Buying PartsNetwork Cameras are built by reputable manufacturers and can be purchased like any other computer equipment.Analog cameras are built by thousands of no name Chinese manufacturers. Be careful to know what you are is a good vendor.Final ThoughtsDigital Surveillance is a high profit and relatively easy to do business.It requires a high materials costMake sure you plan properly, and buy good product. You don't want $6000 of equipment installed and have the project

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