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Terms of Use

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May 2021

Danish (Dansk)

Fotografering af dokumenter

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Scanning er ikke den eneste måde at få billeder af dine dokumenter på. Du kan fotografere dokumenter med et kamera eller en mobiltelefon åbne fotografierne i ABBYY FineReader 14 og genkende dem.

Når du tager billeder af dokumenter, bør en række faktorer tages i betragtning for at gøre billedet bedre egnet til genkendelse. Disse faktorer er beskrevet i detaljer i de følgende afsnit:

Krav til kamera

Dit kamera skal opfylde følgende krav for at lave dokumentbilleder, der kan genkendes med sikkerhed.

Anbefalede kameraegenskaber

Opløsning: Billedsensor: 5 millioner pixel for A4-sider. Mindre sensorer kan være tilstrækkeligt til at tage billeder af mindre dokumenter, som f.eks. visitkort.
Funktion til deaktivering af flash
Manuel blænderåbning, dvs. findes i Av- eller fuld manuel tilstand
Manuel fokus
En anti-rystefunktion (billedstabilisering) eller egnethed til brug med stativ.
Optisk zoom

Minimumskrav

Billedsensor: 2 millioner pixel for A4-sider.
Variabel brændvidde.

Se dokumentationen der fulgte med kameraet for flere oplysninger om kameraet.

Belysning

Belysning påvirker i høj grad kvaliteten af det resulterende billede.

De bedste resultater kan opnås med skarpt og jævnt fordelt lys, helst dagslys. På en solrig dag kan du øge blænden for at få et skarpere billede.

Brug af blitz og ekstra lyskilder

Hvis du bruger kunstig belysning, så brug to lyskilder, der er placeret, så skygger eller blænding undgås.
Hvis der er nok lys, skal du deaktivere blitzen for at forhindre skarpt glanslys og skygger. Når du bruger blitz under dårlige lysforhold, skal du sørge for at tage billeder fra en afstand på ca 50 cm.

Vi fraråder brug af blitz, når der tages billeder af dokumenter, der er udskrevet på blankt papir. Sammenlign et billede med genskin og et billede af god kvalitet:

Hvis billedet er for mørkt

Indstil en lavere værdi på blænden.
Indstil en højere ISO-værdi.
Brug manuel fokus, da automatisk fokus ikke altid virker under dårlige lysforhold.

Sammenlign et billede, der er for mørkt med et billede af god kvalitet:

Sådan tages billeder

For at opnå billeder af dokumenter i god kvalitet skal du sørge for at placere kameraet korrekt og følge disse enkle anbefalinger.

Brug et stativ, når det er muligt.
Linsen skal placeres parallelt med siden. Afstanden mellem kameraet og dokumentet skal vælges, så hele siden passer på billedet, når du zoomer ind. I de fleste tilfælde vil denne afstand være mellem 50 og 60 cm.
Glat papirdokumentet eller bogsiderne ud (især i tilfælde med tykke bøger). Tekstlinjer bør ikke have en skævhed på mere end 20 grader, da teksten ellers ikke kan konverteres korrekt.
Du kan få skarpere billeder ved at fokusere på midten af billedet.
Aktivér anti-rystefunktionen, da længere eksponering under dårlig lysforhold kan forårsage sløring.
Brug den automatiske udløserknapfunktion. Dette vil forhindre kameraet i at bevæge sig, når du trykker på udløserknappen. Brugen af automatisk udløser anbefales også selvom du bruger et stativ.

Sådan kan et billede forbedres, hvis:

Billedet er for mørkt, eller kontrasten er for lav.
Løsning: Prøv at bruge kraftigere belysning. Hvis det ikke er muligt, kan du prøve at indstille en lavere blændeværdi.
Billedet er ikke skarpt nok.
Løsning: Autofokus fungerer muligvis ikke korrekt ved dårlig belysning, eller når du tager billeder med lille afstand. Prøv at bruge kraftigere belysning. Brug stativ og selvudløser for at undgå at flytte kameraet, når billedet tages.

Hvis et billede kun er lidt sløret, Korrigering af foto kan værktøjet i OCR Editorens billedredigeringsprogram hjælpe med at få bedre resultater. Se også: Hvis dit dokumentbillede har defekter, og OCR-nøjagtigheden er lav.

En del af billedet er ikke skarpt nok.
Løsning: Prøv at bruge en højere blændeværdi. Tag billeder fra en større afstand med maks. optisk zoom. Fokusér på et punkt mellem midten og kanten af billedet.
Blitzen forårsager blænding.
Løsning: Sluk for blitzen eller prøv at bruge andre lyskilder og øg afstanden mellem kameraet og dokumentet.

11/2/2018 4:19:14 PM

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