Barcode nyeem ntawv
Qhov ntxov tshaj plaws, thiab tseem pheej yig tshaj, barcode scanners yog tsim los ntawm lub teeb ruaj khov thiab ib qhophotosensoruas yog manually tsiv hla tus barcode. Barcode scanners tuaj yeem muab faib ua peb pawg raws li lawv cov kev sib txuas nrog lub computer. Cov laus yog covQauv: RS-232barcode scanner. Hom no yuav tsum tau tshwj xeeb programming rau kev xa cov ntaub ntawv nkag mus rau hauv daim ntawv thov kev pab cuam. Keyboard interface scanners txuas rau lub computer siv aPS/2los yogAT keyboard-compatible adapter cable (a"keyboard wedge& quot;). Tus barcode' cov ntaub ntawv raug xa mus rau lub khoos phis tawj zoo li nws tau ntaus rau ntawm cov keyboard.
Zoo li cov keyboard interface scanner,USBscanners tsis xav tau kev cai code rau kev xa cov ntaub ntawv nkag mus rau hauv daim ntawv thov kev pab cuam. Hauv PCs khiav Windowstib neeg interface ntaus ntawvemulates cov ntaub ntawv sib koom ua ke ntawm kev kho vajtse" keyboard wedge", thiab lub scanner cia li coj zoo li cov keyboard ntxiv.
Niaj hnub nimno smartphones feem ntau muaj peev xwm txiav txim siab barcode siv lawv lub koob yees duab built-in. Google's mobileAndroidoperating system tuaj yeem siv lawv tus kheejGoogle Lensdaim ntawv thov luam theej duab QR cov lej, lossis cov apps thib peb nyiamBarcode Scannernyeem ob qho tib si ib-dimensional barcodes thiab QR codes. Nokia'sSymbianoperating system featured barcode scanner, thaum mbarcodeis aQR codenyeem ntawv rauNiamkev khiav hauj lwm qhov system. Hauv AppleiOS no 11, lub koob yees duab app tuaj yeem txiav txim siab QR cov lej thiab tuaj yeem txuas rau URLs, koom nrog wireless network, lossis ua lwm yam haujlwm nyob ntawm QR Code cov ntsiab lus.Lwm cov ntawv them nyiaj thiab pub dawb muaj peev xwm luam theej duab rau lwm cov cim lossis rau iOS versions dhau los.BlackBerrypab kiag li lawm, App World daim ntawv thov tuaj yeem luam theej duab barcodes ib txwm thiab thauj cov Web URLs uas tau lees paub ntawm lub cuab yeej' s Web browser.Windows Phone 7.5Nws muaj peev xwm luam theej duab barcodes los ntawm lubBingnrhiav app. Txawm li cas los xij, cov khoom siv no tsis yog tsim tshwj xeeb rau kev ntes cov barcodes. Raws li qhov tshwm sim, lawv tsis txiav txim siab ze li sai tau lossis raug raws li kev mob siab rau barcode scanner lossisportable cov ntaub ntawv terminal.
Kev tswj xyuas zoo thiab kev txheeb xyuas
Nws yog ib qho rau cov neeg tsim khoom thiab cov neeg siv cov lej bar code kom muajkev tswj kom zoouas suav nrogpov thawj thiab validationntawm barcodes.Barcode verifications soj ntsuam scanability thiab qhov zoo ntawm barcode nyob rau hauv kev sib piv rau cov qauv kev lag luam thiab specifications.Barcode verifiers feem ntau yog siv los ntawm cov lag luam uas luam thiab siv barcodes. Ib tug trading tus khub nyob rau hauv lubmuab saw hlautuaj yeem kuaj barcode zoo. Nws yog ib qho tseem ceeb los xyuas kom meej ib tug barcode los xyuas kom meej tias ib tug nyeem ntawv nyob rau hauv cov khoom saw muaj peev xwm ntse txhais tau ib tug barcode nrog ib tug tsawg tus nqi yuam kev. Cov khw muag khoom tau txiav txim siab loj rau qhov tsis ua raws li barcodes. Cov kev them rov qab no tuaj yeem txo cov chaw tsim khoom' cov nyiaj tau los ntawm 2% txog 10%.
Lub tshuab ntsuas barcode ua haujlwm raws li tus nyeem ntawv ua, tab sis tsis yog tsuas yog txiav txim siab tus lej barcode, tus neeg txheeb xyuas ua ntau yam kev xeem. Rau linear barcodes cov kev ntsuam xyuas no yog:
Ntug qhov sib txawv (EC)
Qhov sib txawv ntawm qhov chaw reflectance (Rs) thiab nyob ib sab bar reflectance (Rb). EC=Rs-Rb
Yam tsawg kawg bar reflectance (Rb)
Qhov tsawg tshaj plaws reflectance tus nqi hauv ib lub bar.
Qhov tsawg kawg nkaus reflectance (Rs)
Qhov tsawg tshaj plaws reflectance tus nqi nyob rau hauv ib qho chaw.
Symbol contrast (SC)
Symbol Contrast yog qhov sib txawv ntawm qhov tseem ceeb ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv (nrog rau thaj chaw nyob ntsiag to) thiab qhov tsaus ntuj tshaj plaws ntawm lub cim. Qhov sib txawv ntau dua, qib siab dua. Qhov ntsuas tau muab qhab nia raws li A, B, C, D, lossis F. SC=Rmax-Rmin
Yam tsawg kawg nkaus qhov sib piv (ECmin)
Qhov sib txawv ntawm qhov chaw reflectance (Rs) thiab nyob ib sab bar reflectance (Rb). EC=Rs-Rb
Modulation (MOD)
Qhov kev ntsuas no tau muab qhab nia A, B, C, D, lossis F. Qib no yog nyob ntawm kev sib raug zoo ntawm qhov tsawg kawg nkaus qhov sib txawv (ECmin) thiab cov cim sib txawv (SC). MOD=ECmin/SC Qhov ntau dua qhov sib txawv ntawm qhov tsawg kawg nkaus qhov sib piv thiab cov cim sib piv, qhov qis dua. Cov tshuab luam ntawv thiab cov neeg kuaj xyuas pom pom cov kab nqaim thiab qhov chaw kom muaj kev siv zog tsawg dua li qhov dav thiab qhov chaw; qhov kev sib piv ntawm qhov kev siv zog tsawg dua ntawm cov ntsiab lus nqaim rau cov ntsiab lus dav yog hu ua modulation. Cov mob no yog cuam tshuam los ntawm qhov loj ntawm aperture.
Inter-tus cwj pwm sib txawv
Nyob rau hauv discrete barcodes, qhov chaw uas disconnects ob tug contiguous cim. Thaum tam sim no, qhov sib txawv ntawm tus cwj pwm sib txawv yog suav tias yog qhov chaw (cov ntsiab lus) rau lub hom phiaj ntawm kev txiav txim siab ntug thiab qhov ntsuas qhov ntsuas qhov ntsuas.
Tsis zoo
Txiav txim siab
Extracting cov ntaub ntawv uas tau encoded nyob rau hauv ib tug bar code cim.
Kev txiav txim siab
Muaj peev xwm muab qhab nia raws li A, B, C, D, lossis F. Qib Decodability qhia txog qhov yuam kev ntawm qhov dav ntawm qhov sib txawv ntawm cov cim feem ntau. Qhov tsawg deviation nyob rau hauv lub symbology, cov qib siab dua. Decodability yog ib qho kev ntsuas ntawm qhov tseeb ntawm kev luam tawm siv cov cim siv kev txiav txim siab algorithm.
2D matrix cim saib ntawm qhov tsis:
Cim sib piv
Kev hloov kho
Txiav txim siab
Kev kho qhov yuam kev tsis siv
Tsau (finder) qauv kev puas tsuaj
Daim phiaj tsis sib xws
Axial tsis sib xws
Nyob ntawm qhov parameter, txhua tusANSIxeem yog qhab nia ntawm 0.0 mus rau 4.0 (F rau A), los yog muab ib tug pass los yog ua tsis tau tejyam. Txhua qib yog txiav txim los ntawm kev txheeb xyuas qhovscan reflectance profile(SRP), ib qho piv txwv ntawm ib kab scan ib kab hla tag nrho cov cim. Qhov qis tshaj ntawm 8 qib yog qib scan, thiab tag nrho ISO cim qib yog qhov nruab nrab ntawm cov qib scan ib leeg. Rau feem ntau daim ntawv thov 2.5 (C) yog qhov tsawg kawg nkaus tau txais cov cim qib.
Piv nrog rau tus nyeem ntawv, tus ntsuas ntsuas ntsuas barcode' tus yam ntxwv kho qhov muag rau thoob ntiaj teb thiab cov qauv kev lag luam. Kev ntsuas yuav tsum rov ua dua thiab zoo ib yam. Ua li no yuav tsum tau ua tas li xws li kev ncua deb, lub teeb pom kev zoo, lub kaum ntse ntse sensor thiab ntsuas ntsuasaperture. Raws li kev txheeb xyuas cov txiaj ntsig, cov txheej txheem tsim khoom tuaj yeem hloov kho kom luam tawm cov kab ntawv zoo dua uas yuav luam theej tawm cov saw hlau.
Kev lees paub ntawm Barcode tuaj yeem suav nrog kev ntsuas tom qab siv (thiab kev tsim txom) kev sim xws li hnub ci, puas, cuam tshuam, ya raws, thiab lwm yam.
Barcode verifier cov qauv
Barcode verifier cov qauv yog txhais los ntawm covInternational Organization for Standardization(ISO), hauv ISO / IEC 15426-1 (linear) lossis ISO / IEC 15426-2 (2D).Tam sim no thoob ntiaj teb barcode zoo specification yog ISO / IEC 15416 (linear) thiab ISO / IEC 15415 (2D).European StandardEN 1635 tau raug tshem tawm thiab hloov los ntawm ISO / IEC 15416. Tus thawj US barcode zoo specification yogANSI3, 182x. (UPCs siv nyob rau hauv Teb Chaws Asmeskas - ANSI / UCC5).Raws li ntawm 2011 ISO workgroup JTC1 SC31 tau tsim ib tugDirect Part Marking (DPM)Cov qauv zoo: ISO / IEC TR 29158.
