Workingprinciple
Monitoringisthephysicalbasisforreal-timemonitoringofkeydepartmentsorimportantplacesinvariousindustries.Managementdepartmentscanuseittoobtaineffectivedata,imagesorsoundinformation,andpreventsuddenabnormalities.Theprocessoftheincidentismonitoredandmemorizedintimetoprovideefficientandtimelycommandandheight,deploypoliceforce,andhandlecases.Withtherapiddevelopmentandpromotionofcurrentcomputerapplications,apowerfulwaveofdigitizationhasbeensetoffallovertheworld,andthedigitizationofvariousequipmenthasbecometheprimarygoalofsecurityprotection.Theperformancecharacteristicsofdigitalmonitoringalarmare:real-timedisplayofmonitoringscreen,single-channeladjustmentfunctionofvideoimagequality,eachvideospeedcanbesetseparately,fastretrieval,multiplevideomodesettingfunctions,automaticbackup,pan/tilt/lenscontrolfunction,Networktransmission,etc.
Addatimegeneratortosuperimposethetimedisplayontheimage.Whenthelineislong,installanaudioandvideoamplifiertoensurethequalityofaudioandvideomonitoring.Scopeofapplication-internalandexternalenvironmentsofbanks,securitiesbusinesspremises,enterprises,institutions,governmentagencies,andcommercialpremises,buildingpassages,parkinglots,internalandexternalenvironmentsofhigh-endcommunities,libraries,hospitals,andparks.
Productinterfacemap
Thesysteminnovativelyrealizestheintegrationandlinkageofvideosurveillanceandconference,soastoachievethedualfunctionsofmonitoringandcommunication,andfullymeettheneedsoftransportation,waterconservancy,oilfields,banks,Remotemonitoringandemergencycommandrequirementsinvariousfieldssuchastelecommunications.
Scopeofapplication:suitableformonitoringofrealestate,buildings,factories,warehouses,logistics,chainstores,stores,andkindergartenparent-childonline
Typicalapplications
VideosurveillancesystemNetworking,taketrafficvideosurveillanceasanexample,asshowninthefigurebelow.
Theabovetrafficvideosurveillancecanbecarriedout:
Licenseplaterecognition
Ifthevideosceneisaroadjunctionoracommunityentrance,aslongasthelicenseplateareaisAppearedinthevideo,thedevicecanautomaticallyrecognizethelicenseplatenumberandprompttheuserintext.Itcanbeusedfortheinspectionofillegalvehicles.Forexample,alicenseplatevehicleescapedafteranaccident.Ifthereareintelligentrecognitionvideoserversatallmajorcrossingsinthecity,thesystemcanonlysetoneorseverallicenseplatenumbersthatneedtobecheckedintothesystematatimethroughthenetwork.Ineachofthesmartdevices,oncethevehiclewiththislicenseplatehasappearedinthefieldofvision,itcanimmediatelyalertandsavealotofpoliceresources.
Vehiclespeedmeasurement
Forexample,thedistanceconfirmationmarkingofhighway,alwaysremindthedrivernottospeed,butspeedingstillhappensfrequently.Imagineifyouinstallanintelligentvideoserveronthehighway,weonlyneedtodrawtwolinesinthefieldofview.Ifweknowthattheactualdistancebetweenthetwolinesis100M,inputitintothedevice,andthedevicecanautomaticallycalculateeachentry.Thespeedofthevehicle,andimmediatelycallthepolicewhenspeeding.
Retrogradewarning
Forexample,one-wayroadsorexitsorentrancesofstationsandairports.Theflowoftrafficandpeopleareallone-way.Oncesomeonegoesretrograde,thesystemwillautomaticallyRecognizeandgenerateanalarm.
Trafficstatistics
Smartdevicescanidentifypassingpedestriansandvehicles,andcanalsocountpassingpeopleorThenumberofcars.Imagineinstallingsuchasmartdeviceatanintersectionortheentranceofaconventionandexhibitioncenter,andyoucancountthepasttrafficorpeopleflow.Itcanprovidemoreandmoretimelyinformationforbusdispatching.
Thebiggestfeature
Thesysteminnovativelyrealizestheintegrationandlinkageofvideosurveillanceandconference,andcanmanageremoteequipmentflexiblyandeffectively.Throughtherecording,playback,linkagealarm,monitoringstrategyformulation,emergencycommandandotherapplicationsofremotemonitoringobjects,thedualfunctionsofmonitoringandcommunicationareachieved.
Itsbiggestfeatureisthatitsupportsviewingvideoscreensfrommobileterminalssuchassmartphones/tablets,andsupportstransferringmonitoringscreensintovideoconferencestoachieveemergencycommandandremotedispatch.
Componentsofequipment
Videosurveillancesystemproductsincludeopticaltransceiver,opticalcableterminalbox,PTZ,PTZdecoder,videomatrix,harddiskvideorecorder,surveillancecamera,lens,bracket.Videosurveillancesystemcomponentsincludesurveillancefrontend,managementcenter,surveillancecenter,PCclientandwirelessbridge.Thedescriptionofeachcomponentisasfollows:
(1)Monitoringfrontend:Itisusedtocollectmonitoringinformationofthemonitoredpointandcanbeequippedwithalarmequipment.①Ordinarycamera+videoserver.Theordinarycameracanbeananalogcameraoradigitalcamera.Theoriginalvideosignalistransmittedtothevideoserver,andafterbeingencodedbythevideoserver,itistransmittedtootherdevicesthroughthenetworkusingtheTCP/IPprotocol.
②Webcamera.Thewebcameraisanadvancedcameradevicethatintegratescamera,videoencoding,andWebservices,withaTCP/IPprotocolstackembedded.Youcanconnectdirectlytothenetwork.
(2)ManagementCenter:Itisresponsibleforthemanagement,control,alarmprocessing,videorecording,videoplayback,andusermanagementofallfront-endequipment.Eachpartofthefunctionisperformedbyadedicatedserver.
(3)Monitoringcenter:usedtocentrallymonitortheareaunderitsjurisdiction,includingtheTVwallandmonitoringclientterminalgroups.Therecanbeoneormoremonitoringcentersinthesystem.
(4)PCclient:Inadditiontothemonitoringcenter,aPCcanalsobeconnectedtothenetworkforremotemonitoring.
(5)Wirelessnetworkbridge:ThewirelessnetworkbridgeisusedtoaccessthewirelessdatanetworkandaccesstheInternet.Throughthewirelessnetworkbridge,themonitoringinformationontheIPnetworkcanbetransmittedtothewirelessterminal,andthecontrolcommandofthewirelessterminalcanalsobetransmittedtothevideomonitoringmanagementsystemontheIPnetwork.ThecommonlyusedwirelessnetworkistheCDMAnetwork.
Featuresofwork
Digitalization
ThedigitizationofvideosurveillancefirstItshouldbethattheinformationflow(includingvideo,audio,control,etc.)inthesystemischangedfromanalogtodigital.Thiswillcompletelybreakthestructureof"classicclosed-circuittelevisionsystemiscenteredoncameraimagingtechnology"andfundamentallychangethevideosurveillancesystemfromWaysandstructuresofinformationcollection,dataprocessing,transmission,systemcontrol,etc.Thedigitizationofinformationflow,codingandcompression,andopenprotocolsenableseamlessconnectionbetweentheintelligentnetworkvideosurveillancesystemandthevarioussubsystemsinthesecuritysystem,andrealizemanagementandcontrolonaunifiedoperatingplatform.Thisisthesystemintegrationmeaning.
Networked
ThenetworkedvideosurveillancewillbeintegratedbythestructureofthissystemTransitiontoadistributedsystem.Thedistributedsystemadoptsamulti-layerhierarchicalstructure.Ithasamicro-kerneltechnologywithmulti-tasking,multi-user,anddistributedoperatingsystemtorealizetherapidresponseofthepreemptivetaskschedulingalgorithmtoformadistributedvideosurveillancesystem.Thehardwareandsoftwareofthesystemadoptstandardized,modularandsystematicdesign.Theconfigurationofvideosurveillancesystemequipmenthasstrongversatility,goodopenness,flexiblesystemconfiguration,completecontrolfunctions,convenientdataprocessing,friendlyman-machineinterfaceandsysteminstallation,Simpledebuggingandmaintenance,systemsafety,fault-tolerantandreliablefunctions.
Systemintegration
ThenetworkofvideosurveillancehasbrokentosomeextentThegeographicalandquantitativeboundariesofthedeploymentcontrolareaandequipmentexpansion.Systemnetworkingwillenablethesharingofhardwareandsoftwareresourcesoftheentirenetworksystem,aswellasthesharingoftasksandloads.Thisisanimportantconceptofsystemintegration.Closed-circuitmonitoringsystemcantimely,image,andtrulyreflectthescreenofthemonitoredandcontrolledobjectinoccasionswherepeoplecannotdirectlyobserve.Theclosed-circuitmonitoringsystemhasbecomethemosteffectiveobservationtoolforthemajorityofuserstomonitorinmodernmanagement.Inthecontrolcenter,aslongasoneworkeroperates,itispossibletoobservemultiplecontrolledareas,aswellasthemonitoringfunctionofremoteareas.
Mainfunctions
1.Localvideo,savelocalvideosurveillancevideodatawithinacertainperiodoftime,andcaneasilyqueryandcollectevidencetoprovideabasisforsubsequentinvestigations.
2.TheremotevideosurveillancemonitoringpersonnelcanremotelyarbitrarilyretrievethesurveillanceimagesstoredintheInternetcafes,andcanremotelyissuecontrolinstructions,intelligentretrievalofvideodata,playback,adjustmentofthecameralensfocallength,andcontrolofthePTZInspectionorlocaldetailedobservation.
3.AuthoritymanagementInordertoensuretheprivacyofInternetusersandthesecurityofvideodata,thesystemhasoperationauthoritymanagement,andsystemloginandoperationarestrictlycontrolledtoensurethesecurityofthesystem.
4.Theserverplatformstructureisconvenient.Theserversoftwarecanbeeasilyinstalledinthemunicipalpublicsecuritybureau,district(county)publicsecuritybureauandvariouspolicestations.YouonlyneedtoassignusersloginaccountswithdifferentpermissionstoviewInternetcafemonitoringinformationinthejurisdiction.
5.ThesystemcontainsthemanagementofthebasicinformationoftheInternetcafe,andtheelectronicmapiscombined.WhenanemergencyoccursintheInternetcafe,thebasicinformationoftheInternetcafecanbeobtainedintime(theInternetcafephonenumber,address,personincharge),AndcontacttherelevantpersoninchargeoftheInternetcafemorequickly.
6.ThecombinationofInternetcafemonitoringandelectronicmapallowsyoutoviewthegeographicallocationofInternetcafesmoreintuitivelythroughtheelectronicmap,anddisplaytheoperatingstatusoftheInternetcafemonitoringequipmentinrealtimeontheelectronicmap.WhenyouneedtoviewthemonitoringinformationofanInternetcafe,justdouble-clicktheInternetcafeontheelectronicmaptoenterthemonitoringinterfaceoftheInternetcafe.
7.WhentheInternetpersonnelpresenttheirIDcardattheservicecounteroftheInternetcafetoregisterfortheInternet,thesystemcanautomaticallytakeaphotooftheInternetuserandtransmitthecorrespondingInternetcardinformationoftheInternetusertotheserverofthemonitoringcenterofthepublicsecurityorganforstorage.
8.Surveillancerecordingfunctionanytime,anywhere,nomatterwhereyouare,anypasswordauthorizeduserconnectstothesurveillancenetworkthroughthecomputeraroundyou,youcanseethereal-timeimageofanysurveillancenetworkandrecordasneeded,Toavoidtheinconvenienceofsupervisionandmanagementcausedbygeographicalseparation.
9.Thesystemhasstrongscalability.Ifyouneedtoaddanewmonitoringnetwork,justaddthecorrespondingInternetcafeinformationandequipmentinformationontheserverside.
10.Highsecurity,imagemaskingtechnologytopreventillegaltamperingwithvideodata;onlyauthorizeduserscanbackupvideo,effectivelypreventingmaliciousdamage;powerfullogmanagementfunctionsensurethesafeuseofdedicatedsystems.Thedatatransmittedbetweentheserverandtheclientareallencrypted.
Specialfeatures
Multi-screenmonitoringeffect
Youcanchooseanydisplaymodeaccordingtoyourneeds,andcontrolthecamera'slensangleasneeded,Adjustthevideoandaudioeffectsofthedisplayscreen,whichgreatlyfacilitatesthecentralizedviewingofremotesurveillancevideobythemonitor
Specificvideowalldisplaymode
Throughsetting,keeptheuser'scomputerscreenoperationconsistentwiththeactualdisplayoftheTVwall;provideflexibleandconvenientdisplaymodessuchascyclecycles,andrealizetheidealviewingplanforcustomers.
FlexiblealarmlinkageMethod
Alarmtriggeringconditionscanbesetflexibly,andremotepromptsandlinkagefunctionsforevent-triggeredalarmsareprovided.Forexample,thealarminformationissenttootherusersinvariouswayssuchasscreenprompts,emails,alarmlinkage,anddesignatedrecording.
Variousrecordingstrategies
SystemProvidesthreerecordingstrategies:default,customandsmart;providesaseriesofmanagementfunctionssuchasregularuploadandbackupofvideodatafiles,retrievalandquery;inresponsetouserrequirementsforvideofilesondemand,authorizeduserscanwatchonlineordownloadandarchive.
Specialmotiondetectionfunction
Byanalyzingandcomparingthechangesofimagedata,wecandeterminethebehavioronthespot.Aseriesoflinkageoperationsofthemonitoringsystemarerealizedbyanalyzingtheimagechangesofthemonitoringsourcelocation
Theoriginalvideoconferencelinkage
ThesystemcanconnectanychannelorMulti-channelmonitoringscreensaretransferredtothevideoconferencesystemformulti-partydiscussion,soastoachievetheperfectintegrationofmonitoringandcommunication
Developmenthistory
Thevideomonitoringsystemconsistsofreal-timecontrolsystem,monitoringsystemandmanagementInformationsystemcomposition.Thereal-timecontrolsystemcompletesthefunctionsofreal-timedataacquisition,processing,storage,andfeedback;themonitoringsystemcompletesall-weathermonitoringofeachmonitoringpoint,andcanswitchmultipleimagesatmultipleoperationcontrolpoints;themanagementinformationsystemcompletesthecollectionofvariousrequiredinformation,Receiving,transmitting,processingandprocessingarethecontrolcoreofthewholesystem.
Thevideosurveillancesystemisanintegralpartofthesecurityprotectionsystem.Itisacomprehensivesystemwithstrongprotectioncapabilities.Videosurveillanceiswidelyusedinmanyoccasionsduetoitsintuitiveness,convenienceandrichinformationcontent.
Thevideosurveillancesystemhasbeendevelopedinjustovertwodecades,fromanalogsurveillanceinthe19thgenerationand1980stofierydigitalsurveillanceandthentotheascendantnetworkvideosurveillance,whichhasundergoneearth-shakingchanges.AsIPtechnologygraduallyunifiestheworldtoday,itisnecessaryforustore-understandthehistoryofthedevelopmentofvideosurveillancesystems.Fromatechnicalpointofview,thedevelopmentofvideosurveillancesystemsisdividedintothefirst-generationanalogvideosurveillancesystem(CCTV),tothesecond-generationdigitalvideosurveillancesystem(DVR)basedon"PC+MultimediaCard",tothethird-generationbasedentirelyonIPnetworkvideosurveillanceSystem(IPVS).
Thefirstgeneration
Thefirstgenerationofvideosurveillanceisatraditionalanalogclosed-circuitvideosurveillancesystem(CCTV)
Itreliesoncameras,cables,videorecordersandmonitors,etc.Professionalsetting.Forexample,thecameraoutputsavideosignalthroughadedicatedcoaxialcable.Thecableisconnectedtodedicatedanalogvideoequipment,suchasvideoscreensplitter,matrix,switcher,videocassetterecorder(VCR)andvideomonitor,etc.AnalogCCTVhasalotoflimitations:
Thelimitedmonitoringcapabilityonlysupportslocalmonitoring,whichislimitedbythetransmissionlengthoftheanalogvideocableandthecableamplifier.
Limitedscalabilitysystemsareusuallylimitedbytheinputcapacityofvideoscreensplitters,matrices,andswitchers.
Userswithheavyvideoloadmusttakeoutthevideotapefromthevideorecorderorreplaceitwithanewvideotapetosave,andthevideotapeiseasytobelost,stolenorinadvertentlyerased.
Poorvideoqualityisthemainlimitingfactor.Thevideoqualitydecreasesasthenumberofcopiesincreases.
Thesecondgeneration
Thesecondgenerationofvideosurveillanceisthecurrent"analog-digital"surveillancesystem(DVR):
The"analog-digital"surveillancesystemisWiththedigitalharddiskvideorecorderDVRasthecoresemi-analog-semi-digitalsolution,thecoaxialcableisstillusedtooutputvideosignalsfromthecameratotheDVR.TheDVRsupportsbothrecordingandplayback,andcansupportlimitedIPnetworkaccess.SinceDVRproductsarediverseandthereisnostandard,thisgenerationsystemisanon-standardclosedsystem.TheDVRsystemstillhasalotoflimitations:
Thecomplexwiring"analog-digital"solutionstillneedstoinstallaseparatevideocableoneachcamera,resultinginwiringcomplexity.
ThetypicallimitationofalimitedscalabilityDVRisthatamaximumof16camerascanbeextendedatatime.
LimitedmanageabilityYouneedexternalserversandmanagementsoftwaretocontrolmultipleDVRsormonitoringpoints.
Limitedremotemonitoring/controlcapabilitiesYoucannotaccessanycamerafromanyclient.YoucanonlyaccessthecameraindirectlythroughtheDVR.
ComparedwithRAIDredundancyandtape,the"analog-digital"programvideorecordinghasnoprotectionandiseasytolose.
Thethirdgeneration
ThethirdgenerationofvideosurveillanceisthefuturecompleteIPvideosurveillancesystemIPVS:
Comparedwiththeprevioustwosolutions,thefullIPvideosurveillancesystemThereisasignificantdifference.Theadvantageofthissystemisthatthecamerahasabuilt-inwebserveranddirectlyprovidesanEthernetport.ThesecamerasgenerateJPEGorMPEG4,H.264datafiles,whichcanbeaccessed,monitored,recordedandprintedbyanyauthorizedclientfromanylocationonthenetwork,insteadofgeneratingimagesintheformofcontinuousanalogvideosignals.Thegreatadvantagesoftheall-IPvideosurveillancesystemare:
Simplicity-allcamerasaresimplyconnectedtothenetworkthroughcost-effectivewiredorwirelessEthernet,allowingyoutousetheexistingLANinfrastructure.YoucanuseCategory5networkcableorwirelessnetworktotransmitcameraoutputimagesandhorizontal,vertical,andzoom(PTZ)controlcommands(evendirectlyviaEthernet).
Powerfulcentralcontrol-anindustrystandardserverandasetofcontrolmanagementapplicationsoftwarecanruntheentiremonitoringsystem.
Easytoupgradeandcomprehensivescalability-easilyaddmorecameras.Centralserverscanbeeasilyupgradedtofasterprocessors,largercapacitydiskdrives,andgreaterbandwidthinthefuture.
Comprehensiveremotemonitoring-anyauthorizedclientcandirectlyaccessanycamera.Youcanalsoaccessthesurveillanceimagesthroughthecentralserver.
Ruggedredundantstorage-SCSI,RAIDandtapebackupstoragetechnologycanbeusedatthesametimetopermanentlyprotectthesurveillanceimagefromharddiskdrivefailure.
Prospectanalysis
Withtherapiddevelopmentofthenationaleconomyandtherapiddevelopmentofinformationtechnologyandnetworktechnology,theapplicationofmonitoringsystemsinvariousindustriesisbecomingmoreandmoreextensive.Themonitoringsystemisnolongerjustincommunication.,Transportation,securityandotherindustryapplications.Itisgraduallydevelopinginthedirectionofotherindustriesandthepublic.Withtherapiddevelopmentofcomputer,network,imageprocessingandtransmissiontechnology,videosurveillancesystemtechnologyhasalsomadegreatprogress.Thesituationofsocialsecurityisbecomingmoreandmorecomplex,publicsecurityissuesarebecomingincreasinglyprominent,urbancrimesareprominent,andmethodsareconstantlybeingupdatedandupgraded.Theseareallurgentrequirementstoacceleratethedevelopmentofavideosurveillancesystemthatfocusesonactiveprevention.Sincethe"September11Incident"intheUnitedStatesandtheLondonUndergroundbombing,theurbanemergencypreparednesssystemforemergencieshasbecomeanewhotspotforsecurityconstruction.
China'svideosurveillanceindustryhasgonethroughthreestages,namely,analogvideosurveillance,digitalvideosurveillance,andnetworkvideosurveillance.China'svideosurveillancemarketistransitioningfromanalogtodigital,anddigitalvideosurveillancehasbecomethemainstreamofthemarket.From2004to2012,theproportionofdigitalsurveillanceintheoverallvideosurveillancemarkethasincreasedfrom35.7%to56.7%.Atthesametime,thenetworkvideosurveillancemarketisgrowingsteadily,withitsshareincreasingfrom7.4%in2004to28.2%in2012.
InSeptember2005,theMinistryofPublicSecurityofChinaofficiallylaunchedtheconstructionoftheurbannetworkedalarmandmonitoringsystem,andcarriedouttheconstructionofthealarmandmonitoringsystemattheprovincial,cityandcountylevelsacrossthecountrytopromote"safecities"Thepaceofconstruction.MajorcitiessuchasBeijing,Guangzhou,Shenzhen,Hangzhouandothercitieshavebeguntoacceleratetheconstructionofurbanvideosurveillancesystems.Drivenbytheconstructionanddevelopmentofvariousprojectssuchassafecityconstruction,transportationinformationconstruction,financialmonitoring,safeproduction,andsmarthome,thedemandforvideosurveillanceproductsinChinacontinuestoexpand.In2011,theoverallmarketsizeofChina'svideosurveillanceindustryreached23.04billionyuan,ayear-on-yearincreaseof19.71%.Itisexpectedthattheaveragegrowthrateof21.52%willbemaintainedfrom2012to2015.
Functionalrequirements
Currently,forthemonitoringsystem,theuser'srequirementsforitsfunctionshavebeendiversifiedandsystematized.Mainlymanifestedinthefollowingrequirements:
Remoteaccess.Traditionalvideosurveillanceisgenerallycarriedoutinasmallarea,andusersgenerallyrequirethattheaccesslocationisnotrestrictedbyregion,andcanvisitthemonitoredlocationanytimeandanywhere.
Multiplepeoplevisitthesamemonitoringpointatthesametime.Traditionally,amonitoringpointisgenerallyaccessedbyamonitoringcenter(user).Thesamemonitoringpointislikelytobeaccessedbymultipleusersatthesametime,andtheremaybenorelationshipbetweentheseusers.Thecomplexityofuseraccesswillrequirethesystemtostrengthenthemanagementofaccessrights.
Monitoringpointstendtobescattered,whilemonitoringtendstobecentralized.Monitoringpointsbelongingtothesameuserarebecomingmoreandmorescattered,regardlessofgeographiclimitation.Forthesescatteredmonitoringpoints,centralizedmanagementandcontrolarerequired.
Themonitoringsystemisrequiredtobeopenandexpandable.Thesamesystemshouldsupportmultipledifferenttypesofmonitoringequipment,andthenumberofusersandthenumberofmonitoredpointscanbeeasilyincreasedordecreased.
Massivedatastorage.Networkingenablesthetraditionallocalvideorecordingfunctiontobetransferredtoaremoteserverforrealization,makingitpossibletostoremassiveamountsofdata.Atthesametime,thesystemisalsorequiredtohavestrongerstorage,retrieval,andbackupfunctions.
Informationsecurity.Thecomplexityofthesystem,thediversificationofusers,andthebusinesscharacteristicsofvideosurveillancemustinevitablyrequirethesystemtoprovideastrongguaranteeforinformationsecurity.
Smartvideosurveillance.Thefuturevideosurveillancesystemwillnotonlybelimitedtopassivelyprovidevideoimages,butalsorequirethesystemitselftobesmartenoughtorecognizedifferentobjects,findabnormalitiesinthesurveillanceimages,andsendoutalarmsandalarmsinthefastestandbestway.Provideusefulinformationtomoreeffectivelyassistsecuritypersonnelindealingwithcrises,andminimizefalsepositivesandunder-reports,andbecomeapowerfulauxiliarytoolforrespondingtoattacksandhandlingemergencies.Intelligentvideosurveillancecanalsobeappliedtoavarietyofnon-safety-relatedscenariossuchastrafficmanagement,customerbehavioranalysis,andcustomerservicetoimprovethereturnoninvestmentofusers.
Technicalobstacles
Thelarge-scalenetworkvideosurveillancesystembusinessisstillintheinitialstageofexploration.Networking,digitization,andintelligenceareinevitableforvideosurveillancetrend.Inthefaceofthisgeneraltrend,videosurveillancehasmanydeficienciesinsomekeytechnologies,mainlyinthefollowingaspects.
Mediadistribution
Videosurveillancesystemsgenerallydealwiththedistributionofvideomedia.Simple.Generally,usersdirectlyaccessnetworkcamerasorperformsimplemediaforwardingprocessingthroughvideoservers.Inthefaceofanincreasinglylargeuserbase,thismediatransmissionmethodwillbecomeabottleneckinimagetransmission.Whetherthereisanefficientmediadistributionmechanismwillbecomeanimportantindicatorforjudgingtheprosandconsofavideosurveillancesystem.
Infact,mediadistributionisaproblemthatanyvideoservicewillfaceafterithasdevelopedtoacertainscale.Videosurveillancecanworkwithothervideoservices,suchasIPTV,tostudyvideodistribution.Thefuturevideosurveillancesystemwillbebasedonarelativelycompletemediadistributionplatformtotransmitreal-timevideoinformationandrecordedvideoinformation.
Videostorage
Network-basedvideosurveillancesystemsbasicallyuseacentralvideoservertoStorethevideo.Thecentralvideoserveriseasytomanage,safeandreliable,butbecausethevideoisperformedatanytime,thedataflowislarge,whichbringsgreatpressureonthebearernetwork.Ifthevideostorageismarginalized,althoughthenumberofvideostreamscanbereducedandthepressureonthebearernetworkcanbereduced,thescatteredvideodatawillbringgreattroubletothemanagementofthevideo,andthesecurityofthevideodatawillalsobegreatlyreduced.Itcanbeseenthatinthefuture,thelocationwherealargeamountofstoragedemandoccurscannotbebornebythecentralunifiedstorage,butthereisnotechnicalsolutionavailableforalargeamountofdistributedanddifferentiatedstorage.Thefuturevideosurveillancesystemmustcarryoutareasonablestructuredesigninvideostoragetomeettheactualvideorecordingrequirements.
Concurrentscheduling
UsersofvideosurveillancesystemgenerallydonotThereisaconcurrentrequirement.Evenifabatchofusersmayrequiresimultaneouscallstotheinformationofthesamevideosurveillancepoint,thereisnodifferenceinsuchcalls.Inthefuture,theusersourcesofsystemservicesarediversifiedanduncontrollable,andtheirusepurposesarethesame.Themonitoringsystemhasconcurrentconflictcallstothesamemonitoringpoint.Therefore,priorityrightsandallocationmechanismsmustbeconsidered.
Billing
Thebillingmodelofvideosurveillanceisverysingle,usuallybasedonrental,Oryouonlyneedtoconsiderthetimeorflowofuploadinginformationfromasinglevideomonitoringpointusedaftertheuseraccesses.Theservicechargingpointandchargingscaledonotneedtobetoocomplicated.Generally,simpleRADIUSprotocolcanbeconsidered.Thebillingissuesconsideredinthefuturevideosurveillancesystemincludetheuseofsingle-usertosingleresource,theuseofsingle-usertomulti-resource,theuseofmulti-usertomulti-resource,whichisasinglebillingpointandbillingstandard,andonlyrelyingonconcisebills.Cannotbesupportedbythebillingprotocol.Thefuturesystemshouldsupportmulti-servicestrategiesthatcanbeflexiblychangedandimplementedinbatchesatthesametime,andsupportthereal-timechargingfunctionoftheabove-mentionedvariousbusinessstrategies.
Classification
Someremotevideosurveillancesystemscansupportclassification,butthisclassificationonlyRegardingtheclassificationofcontentdistribution,othersub-functionsystemsinthenetworkarestillconsideredasafirstlevel.
Theclassificationthatthefuturevideosurveillancesystemneedstoconsiderisnotonlytheclassificationofcontentdistribution,becausetheserviceprovidersindifferentregionsoftheentirenetworkhavefouraspects:usercontrol,businessmanagement,contentdistribution,andoperationsupport.Therearedifferencesintherequirementsforlevels.Inthisregard,therequirementsforusercontrolandbusinessmanagementareclosertothevideoconferencingsystemthanasimplepoint-to-pointconversationsystem,andallneedtoberedesigned.
Businessintegration
Remotemonitoringdoesnotconsidermutualcallswithotherbusinesssystems.Thefuturevideosurveillancesystemwillbecross-callingwithmultipleotherbusinesssystems.Multi-layerintercommunicationandresourcesharingbetweendifferentsystemsareissuesthatmustbeconsidered.
Installationprocess
Principles
Withtheenhancementofsecurityawareness,videosurveillancesystemsareslowlyenteringthehomesofordinarypeople.Videosurveillancesolutionsarealsoemerginginendlessly,sowhatprinciplesneedtobefollowedwheninstallingasurveillancesystem?Thefollowing8surveillanceinstallationprinciplesmustbeconsideredfirstwheninstallingasurveillancesystem:
1,thereal-timenatureofthesurveillancesystem,thispointespeciallyimportant.Itispreciselybecauseofthereal-timenatureofthemonitoringsystemthatthemonitoringsystemissonecessary.
2.Security,themonitoringsystemhassafetyprecautionsandconfidentialitymeasurestopreventillegalintrusionintothesystemandillegaloperations.
3.Scalability
Themonitoringsystemequipmentadoptsamodularstructure.Thesystemcaneasilyandflexiblychangethehardwareandsoftwarewhenthemonitoringscale,monitoringobject,ormonitoringrequirementsarechanged.Itisnotnecessarytochangethestructureofthenetworkandthemainsoftwareandhardwareequipment.
4.Openness
Themonitoringsystemfollowstheprincipleofopenness,andthesystemprovidesinterfacesforsoftware,hardware,communications,networks,operatingsystems,anddatabasemanagementsystemsthatcomplywithinternationalstandards.Andtools,sothatthesystemhasgoodflexibility,compatibility,scalabilityandportability.Theentirenetworkisanopensystem,compatiblewiththeproductsofmanymonitoringmanufacturers,andcansupportsecondarydevelopment.
5.Standardization
Theequipmentandtechnologyusedinthemonitoringsystemcomplywithinternationalgeneralstandards.Thiscangiveyouapeaceofmind.
6.Flexibility
Themonitoringsystemhasflexiblenetworkingmethodsandflexiblesystemfunctionconfiguration,whichcanmakefulluseoftheexistingvideomonitoringsubsystemnetworkresources.Thesystemintegratesothersubsystemsintoit,whichcanmeetthebusinessneedsofdifferentmonitoringunits,withcomprehensivesoftwarefunctionsandeasyconfiguration.
7.Advancement
Themonitoringsystemisasadvancedaspossibleonthepremiseofsatisfyingreliabilityandpracticability.Theentiresystemremainsadvancedfortenyearsafteritscompletion,andtheequipmentandtechnologyusedinthesystemcanadapttofuturedevelopmentandcanbeeasilyupgraded.Itwillbecomeanadvancedsecuritysystemthatadaptstofuturedevelopment,hashighreliability,goodconfidentiality,easynetworkexpansion,strongconnectiondataprocessingcapabilities,andeasysystemoperationandoperation.
8.Practicability
Thevideosurveillancesystemhastheabilityandleveltocompletetherequiredfunctionsintheproject.Thesystemconformstotherequirementsofrelevantdomesticandforeignregulationsthatareactuallyrequiredbythisproject,andiseasytoimplementandeasytooperate.Fromtheuser'spointofview,makefulluseofexistingresources,minimizesystemcosts,andenablethesystemtohaveahighercost-performanceratio.
Solution
Interferenceproblemsarecommonproblemsencounteredbysecuritymonitoringsystems.Suchas:snowflakeinterference,webinterference,diagonalinterference,horizontalinterference,upanddownscrollinginterference,distortionanddeformationinterference,andupanddownjitterinterference,etc.,mayinterferewiththenormaloperationofthevideosurveillancesystem.Thespecificsolutiondependsonthespecificsituation.
First,findthesourceofinterference
Wecanfindthesourceofinterferenceinasimpleway.Thethreemajorsourcesofinterferenceare:front-end-interferencefromthecamerasystem;mid-end-interferencefromcoaxialcabletransmission;andback-end-interferencefromequipment.
2.Videointerferencecheckmethod
Useamonitoronthefrontendtoconnectwiththecameratoseeifthereisinterferenceintheimage.Ifthereisinterference,solveitfromthecameraitself(suchasreplacingtheMillionhigh-definitiondigitalnetworkdomecamera),ifthereisnointerference,proceedtothenextstepofinspection.
Disconnectthecoaxialcabletransmissionlinefromthevideodistributororharddiskvideorecorderinthemonitoringroom,connectthemonitorseparatelytoseeifthereisinterferenceintheimage,ifthereisinterference,useananti-interferencedevice.Thiskindofinterferenceiscalled"environmentalelectromagneticinterference",andthiskindofinterferenceismorecommon.Ifthereisnointerference,itmeansthatthecoaxialcabletransmissionlineisnotinterfered.However,interferenceoccursassoonasitisconnectedtotheharddiskvideorecorder,indicatingthatthegroundpotentialdifferencebetweenthesystemequipmentcausesinterference.Itcanbesolvedbyaddingaphotoelectricisolatorbetweenthevideocableandtheharddiskvideorecorder.
Three.Videointerferencesolutions
Front-endinterferencesolutions:Thefront-end-camerasystemintroducesinterferencefromequipmentandshouldberesolvedfromtheequipmentitself(suchascameraquality,voltagestability)Performance,insulation),theinterferenceproblemcannotbecompletelysolvedwithananti-interferencedevice.
Mid-endinterferencesolutionidea:Mid-end-coaxialcabletransmissionisthemostcommoninterference,whichbelongsto"environmentalelectromagneticinterference".Electromagneticinterferencereferstotheinterferenceofthesurroundingenvironmentofthevideocable,includingthefrequencyconversionmotorinterference;electromagneticRadiationinterference;interferencefromhigh-frequencyandlow-frequencyequipment;interferencefromTVtowersandsubstations;strongpulseinterferencecausedbyhigh-powerelectricalappliancessuchasmotors,etc.,canbesolvedwithvideoanti-jammingdevices,suchasK1000.
Back-endinterferencesolution:Theback-end-deviceinterferenceismostlycausedbythegroundpotentialdifferencebetweenthedevices,resultingindiagonallinesandhorizontalbarsscrollingupanddown(rollingbars),whichcanbesolvedbyphotoelectricisolators,Suchassingle-channelphotoelectricisolationanti-jammerK2000,multi-channelphotoelectricisolationdistributorF1600G.
Four.PowerInterference
Videointerferencecausedbyinferiorpowersuppliesismorecommoninfront-endinterference.Inthepast,somecameramanufacturerschoselinearpowersuppliesoutofcautiousconsiderations.However,linearpowersupplieshavedisadvantagessuchaslowconversionefficiency,largevolume,highheatgeneration,andhighmanufacturingcost.Nowadays,thestabilityoftheswitchingpowersupplyhasbeenimprovedalot,andtheswitchingpowersupplywithexcellentproductionandsufficientmaterialshasbecomethemainstreamofcamerapowersupply.Itisrecommendedthatwhenpurchasingasecuritymonitoringpowersupplyforsurveillancecameras,trytotestthepowersupplytocheckitsstability,ripplesizeandotherqualityindicators.
Fifth,themostsuitableinstallationlocationofthevideosurveillancesystem
Professionalcompanythatprovidesdescriptionandconstructionofintelligentsecuritysystemprojectsforcampuses,companies,factories,andindustrialareas,andthesiteselectionoftheprojectLocation:
a.Factoryarea,campusentrance
b.Factoryareaclosed-circuitmonitoring
c.Perimeterwallclosed-circuitmonitoring
d.Closed-circuitmonitoringofproductionworkshop
e.Closed-circuitmonitoringofwarehouse
f.Closed-circuitmonitoringofofficebuildingfinanceroom
g.Closed-circuitmonitoringofdormitoryanti-theft
Anti-theftalarmsystem,accesscontrolandattendancesystem,patrolandmanageinductionwiring