From webcam ... detector? ... PVN?

The quality and quantity of counterfeit banknotes is growing and it is becoming more and more difficult to recognize a fake visually or with an ultraviolet detector. In banks and large stores have already completely switched to checking banknotes with IR detectors. For small shops, this path is, firstly, quite expensive (at least 7,000 rubles), and secondly, for example, we simply have nowhere to put the detector.
Well, let's start. For starters, you need the web camera itself.
I bought the simplest one with a resolution of about 640x480, it doesn’t matter, any other will work.  
Weneedtopulloutaninfraredfilter(IRfilter)fromitsothatourcameracanseeinfraredlight.
Thesefiltersareinalmostallcameras.
Wetakethecamera,atthetoptherewillbeasmallnotch-wehookitwithsomethingsharpandremovetheupperskin.Thiswillalsofreeusaccesstotheotherlatchesthatholdthetwohalvesofthecamera.Thereisasmallrubberplugonthesideofthecamera-youneedtopickitoffwithasharpobject(dentistsknowwhatIam:-))There,inthedepths,thenarrow-eyedChinesehidasmallscrew—turnitawaywithacross-headscrewdriver.Heturnsawaywithdifficulty,largelybecausesomeonewasnottoolazytomakethewholemineandputthistinyscrewinthere.Assoonasyouunscrewthisscrew,thecameracanbeopenedforfurtherexperiments.Now,carefullyandwithoutapplyingexcessivephysicalforce,insertitintothegroovethatsomethingsharpandrevealthetwohalvesofthechamber.Thegroovewillbeatthetopofthecamera:Iremindyou,afterallourexperiments,thecamerawillremainaliveandwillcontinuetoworksuccessfully.Afteropeningit,youcanturnitonandsee-everythingshouldworkfine.Yes,therearesomewiresinside,oneisfrailLEDandpennymatrix.Inthefigure,thecameraisinahalf-disassembledformandisturnedon,itworksperfectly.Carefullyfeedtheblackheadwiththecamera'sopticsontoyou—youmustcarefullyremoveitalongwiththeboardfromtheslotinwhichitrotates.Youneedtotakeoutnotreally,butonlyfromtheslots.That'sit,nowunscrewtheheadwiththeopticsuntilitfallsofftheboard.Afterthat,lookingatthecamera,youshouldseethematrix.Itishighlydesirablenottotouchitwithanythingandtopostponeitaltogethercameratothesidesothatnothinggetsonthematrix.Herethereisasubtlemoment.ThefactisthattheIRfilterisinsertedintotheheadwithopticsandathinborderisdepositedontopthatneedstoberemoved.Youneedtodothisresolutely,notforgettingthattheIR-filterisglassanditcanbeeasilybroken.Thefigureshowsthreearrowspointingtosectionsofaplasticedging,whichshouldbecarefullycutoffAfterthat,youwillimmediatelyhearthecreakingoftheglass-thismeansthatyouarefidgetingontheIRthefilter.Wearealmostthere,nowweneedtoreduceeffortsandcarefullypickouttheIRfilterfromitsplasticembrace.AfterwehaveremovedtheIRfilter,wecollecteverythingback.Turnonthecameraandlook-everythingshouldwork,buttheimagewillbesomewhatwithabitstrangecolors.Thisisnormal.Thisisnatureininfrared:Ingeneral,thesensitivityofthecamerasharplywillincreaseanditsbrightlightwillblind,butforthedarkitwillevenonthemoresensitiveeyes!Everythingisready!Nowsendonthebanknote.Thisishowitlooksonthescreen.100rubles1000rubles(lessthanrastnothan100rubles.buteverythingisclear)General:(clicktoenlarge)Importantnote:Illumination greatlyinfluencesthecamera'swork-ifthedaylighttubeisnotverycontrasting(see.photo)-coldlight,alotofbluelittleinfrared.Muchbetterimagewhenilluminatedwithconventionalincandescentbulbs.(Theidealpictureisobtainedbylightingmoneywithalighterflame!:)Nowwewillmaketheso-callednightvisiondevicefromourcamera.ThemostimportantthingisafterdismantlingtheIRfilterofyoursensitivewebcamshouldgreatlyincrease,whichisveryusefulwhenshootinginlowlightconditions.Morelight-higher"signal"noiseoftheimage,thatis,imagequalityisbetter.Soagoodblackandwhiteimageisbetterthanaverynoisycolorimage.Greatersensitivityandtheabilitytoseeinthedarkwillbeveryusefulifyouneedtomakeasmallsecuritycamera.WeneedtomaketheIRilluminationforthecamerasothatitcanseeincompletedarkness.ItookacoupleofLEDdiodes,thatis,theydroppedthemfromtheoldremotefromthevideorecorder.&Nbsp;Iswitchedthemoninseriesplusthrougha100ohmresistor.andpoweredthemfromthesamecamera.onusb5volts served. That'swhathappened.Scary,it'sbecausewithoutthebody.withdiodeson:Onthephoto,thecamerashootsitselfandthereforethelightofIRdiodesisclearlyvisible,thelightofthesediodesisnotvisibletothesimplehumaneye!Itseesincompletedarknessatadistanceof3meters.Ofcourse2diodesarenotenough,youneedatleast6,butIdidnothaveitanymore.Whenusingabout10-15diodes thecamera willbeabletoseemetersby15.MyClaudiaintotaldarkness.Ingeneral,intheinfraredlightsomeobjectsbecomeunusual: T-shirt withstripesturnwhite,somethingsaretransparentforexampleliketheCokeinthepicture:Itisastransparentaswater.a.Thisisbecauseinfraredlightpassesthroughsomeobjects,andvisiblelightdoesnot.Well,wealreadytalkedaboutpapermoneyinthelight...In short, you can do a lot of things with imagination and keenness of a webcam.

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