Axis Q7436 - Page 35

AXISQ7436VideoEncoderBlade
AXISVideoMotionDetection
Note
•Visualconrmationisdisabledafter15minutes.
•Aftermodifyingasetting,clickSavetoapplythechange.Thevideostreamwillberestartedanditmaytakeafewseconds
beforethechangeisapplied.
•Enablingvisualconrmationmayintroducevideolatency.
IgnoreFilters
IfAXISVideoMotionDetection3detectstoomanyunwantedobjects,startbymodifyingtheincludeandexcludeareas.Ifstilltoo
manyobjectsaredetected,useoneormoreoftheignorelters.
Supportedignorelters:
•Swayingobjects—Usedtoignoreobjectsthatonlymoveashortdistance
•Short-livedobjects—Usedtoignoreobjectsthatonlyappearintheimageforashortperiodoftime
•Smallobjects—Usedtoignoresmallobjects
Ignoreltersareappliedtoallmovingobjectsfoundbytheapplicationandshouldbeconguredwithcaretoensurethatno
importantobjectsareignored.
Onlyuseignoreltersifneededanduseasfewltersaspossible.Enableandcongureonelteratatimeandusevisualconrmation
toverifythesettingsbeforeenablinganotherlter.Whenconguringalter,startwithasmallltersize,clickSaveandusevisual
conrmationtoverifythesettings.Ifrequired,increasetheltersizeinsmallstepsuntilthenumberofunwantedobjectsisreduced.
SwayingObjectIgnoreFilter
Theswayingobjectlterisusedtoavoiddetectingobjectsthatonlymoveashortdistance,forexamplemovingtrees,agsandtheir
shadows.Usethelterifsuchobjectscausealotoffalsedetections.Iftheswayingobjectsinthescenearelarge,forexamplelarge
pondsorlargetrees,useexcludeareasinsteadofthelter.Thelterwillbeappliedtoallmovingobjectsinsceneand,ifsetto
avaluetoolarge,importantobjectsmightnotbedetected.
Whentheswayingobjectlterisenabledandtheapplicationndsamovingobject,theobjectwillnotbereportedasdetected(red
polygoninvisualconrmation)untilithastravelledadistancelargerthanthesetltersize.Thealarmsentbytheapplicationwillbe
sentwhentheobjectisdetected.Ifthealarmisusedtostartarecording,congurethepre-triggertimesothattherecordingalso
includesthetimetheobjectmovedinthescenebeforebeingdetected.
Toenablethelter:
1.SelecttheSwayingobjectsoption.
2.Clickonthe
icontoshowtheltersizeintheimage.
3.Usethemousetoadjusttheltersize.Startwithasmallsize.Objectsmovingadistanceshorterthanthedistancefrom
thecenterofthecrosstooneofthearrowheadswillbeignored.Theltercanbemovedtothelocationofaswaying
objecttomakeiteasiertoadjustthesize.Notethatthelterwillbeappliedtoallobjectsintheimage,notonlytothe
onesatthelocationwherethelterisplaced.
4.ClickSavetoapplythelter.
5.Usevisualconrmationtoverifythesettings.
6.Iftheresultisnotsatisfactory,increasetheltersizeinsmallsteps.
Theltersizecanalsobesetbyenteringavaluebetween10and50intheeld.Thevaluecorrespondstothedistancefromthe
centerofthecrosstooneofthearrowheads.Thevalue100impliesthatanobjectmusttravelfromitsinitialpointtoonethirdofthe
imagewidthorheightbeforebeingdetected.Thevalue50implieshalfthatdistance,thatis,theobjectmusttraveladistanceof
onesixthoftheimagewidthorheightbeforebeingdetected.
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