Axis Communications P3915-R ViewArea

AXISP3915–RNetworkCamera

VideoandAudio

EnableBacklightcompensation-Enablethisoptionifabrightspotoflight,forexamplealightbulb,causesotherareasin

theimagetoappeartoodark.

Exposurezones-Thissettingdetermineswhichpartoftheimageisusedtocalculatetheexposure.Formostsituations,theAuto

settingcanbeused.Forparticularrequirements,selectapredenedarea.

Theshutterandgainsettingsaffecttheamountofmotionblurandnoiseintheimage.Toadapttodifferentlighting,available

storagespaceandbandwidth,itisoftennecessarytoprioritizeeitherlowmotionblurorlownoise.TheAxisproductallows

usingdifferentprioritizationinnormallightandinlowlight.

Shutterspeedisrelatedtotheamountoftimetheshutterisopenedandismeasuredinseconds(s).Aslowshutterspeedallows

morelighttoreachthesensorandcanhelpproduceabrighterimageinlowlightsituations.Ontheotherhand,aslowshutter

speedcancausemovingobjectstoappearblurry.

SetShutterto

•Autotosettheshutterspeedautomatically .Ifrequired,useMaxshuttertolimittheshutterspeedtopreventtheframe

ratefrombeingreduced.Forexample,toget30fps,setMaxshutterto1/30.

•Fixedtouseaxedshutterspeed.

Gain,measuredindecibel(dB),istheamountofamplicationappliedtotheimage.Ahighgainmayprovideabetterimageinlow

lightsituationsbutwillincreasetheamountofimagenoise.

SetGainto

•Autotosetthegainautomatically.Ifrequired,useMaxgaintolimittheappliedgain.

•Fixedtouseaxedgain.

WhenShutterandGainarebothsettoAuto,itispossibletosetthePrioritybetweenlowmotionblurandlownoisemanuallyandto

useadifferentPriorityinNormalLightandinLowLight.

Example

Consideranareawherepeopleorvehiclesmoveduringtheday,butwherethereshouldbenomovementsduringnight.Tobeableto,

forexample,recognizefacesorlicenseplates,movethenormallightpriorityslidertowardlowmotionblur .Atnighttime,motion

detectionismoreimportantthanidentication.Motionblurisacceptableandsincelowlightcancausealotofnoise,move

thelowlightpriorityslidertowardlownoise.

Example

Ifstoragespaceorbandwidthislimited,tryusingalowergain.Thiswillreduceimagenoiseandproducesmallerimageles.

ViewArea

Aviewareaisacroppedpartofthefullview.EachviewareaistreatedasavideosourceinLiveViewandhasitsownvideo

streamandPTZsettings.

Whensettingupaviewareaitisrecommendedthatthevideostreamresolutionisthesamesizeasorsmallerthantheviewarea

size.Settingthevideostreamresolutionlargerthantheviewareasizeimpliesdigitallyscaledupvideoaftersensorcapture,

requiringmorebandwidthwithoutaddingimageinformation.

Toenable,gotoVideo&Audio>CameraSettingsandselectEnableViewAreas.

Toaddanewviewarea:

1.GotoVideo&Audio>ViewArea.

2.ClickAdd.

3.ThenewviewareaappearsunderSelectedviewarea.EnteradescriptivenameintheNameeld.