Axis Q2901-E - About Overlays

AXISQ2901-ETemperatureAlarmCamera
VideoandAudio
ExposureSettings
Conguretheexposuresettingstosuittheimagequalityrequirementsinrelationtotemperaturevariationsinthescene.
Automaticgaincontrol-Thissettingisusedtoautomaticallyadjustthegaintoanappropriaterange,theweakertheimagesignal,
thestrongerthegain.SelecttheLinearorEqualizationautomaticgaincontrolmethod.Thelatterusesahistogramequalization
method,whichadjuststhegaindynamicallybydistributingthemostfrequentintensityvalues.
Exposurezones-Thissettingsdetermineswhichpartoftheimageisusedtocalculatetheexposure.Formostsituations,theAuto
settingcanbeused.Forparticularrequirement,selectDenedandthenclickEditandselectoneofthepredenedareas.
Gain-Gainistheamountofamplicationappliedtoanimagesignal.Moregainmeansmorecontrastandmoredetailsbutalso
morenoise.Themaxgainvalueissetforallscenes,butaffectsprimarilylowcontrastscenescontrollingtheamountofallowednoise
intheimage,whichinturnalsolimitsthecontrast.
Aboutoverlays
Overlaysaresuperimposedoverthevideostream.Theyareusedtoprovideextrainformationduringrecordings,suchasatimestamp,
orduringproductinstallationandconguration.
Aboutoverlaytext
Anoverlaytextcanincludethecurrentdateandtime,oratextstring.Whenusingatextstring,so-calledmodierscanbeusedto
display,forexample,thecurrentbitrateorthecurrentframerate.
Youcanchoosebetweenthefollowingtextoverlaysizes:
Size
TextheightBackgroundheight
Small
10pixels20pixels
Medium16pixels28pixels
Large21pixels36pixels
Itisalsopossibletodisplaytextwhenanactionruleistriggered,seeHowtoincludeoverlaytextinanactionruleonpage21.
Howtoincludeoverlaytext
1.GotoVideo&Audio>VideoStreamandselecttheImagetab.
2.Toincludedateandtime,selectIncludedateandIncludetime.
3.Toincludeatextstring,selectIncludetextandenterthetextintheeld.Modierscanbeused,seeFileNaming&
Date/TimeFormatsintheonlinehelp
.
4.Selectsize,color,andplacementofthetextstring.
5.ClickSave.
Tomodifythedateandtimeformat,gotoSystemOptions>Date&Time.SeeDate&Timeonpage53.
Howtoincludeoverlaytextinanactionrule
1.GotoVideo&Audio>VideoStreamandselecttheImagetab.
2.UnderOverlaySettings,selectIncludetext.
3.Enterthemodier#D.Whentheruleistriggered,#Disreplacedbythetextspeciedintheactionrule.
Additionaltextinthiseldwillbedisplayedalsowhentheactionruleisnotactive.
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