OCR Mit Freier Software

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OCR mit freier Software Scannen und dann? Worum geht es? ● OCR – Optical Character Recognition ● Automatisches Extrahieren von Text aus Bildern ● Für verschiedene Zeichensätze, Sprachen und Schriften ● mit/ohne Erhalt des Layouts Voraussetzung/Vorbearbeitung ● Möglichst guter Scan bzw. gutes Foto – Ausreichende Auflösung (200..400dpi) – Ausrichtung (Landscape, Kopfstand) – Geraderichten – Kontrasterhöhung, z.B. bei Schwarz auf Grau – Geeignetes Dateiformat Aufgabenstellung ● Umsatzsteuerrecht → Abliefernachweis EU ● ca. 200 Lieferungen je Monat ● Versandbescheinigungen von Speditionen und Packetdiensten ● (halb-)automatische Zuordnung zu eigenen Lieferscheinen ● Stapelscanner → FTP-Server ● PDF-Format, 300dpi, schwarz/weiß OCR-Software für Linux ● Kommerziell: Kofax, Abby, ... ● Frei, Debian (apt-cache search ocr) – gocr – ocrad – tesseract – cuneiform gocr ● Verarbeitet nur pnm-Files ● convert aus imagemagick benutzen ● Verschiedene Ausgabeformate (ISO8859_1, TeX, HTML, UTF8, XML, ASCII) ● Mäßige Erkennungsleistung ● Trainierbar, nicht ausprobiert ocrad ● Verarbeitet pnm-Files, wie gocr ● Schnell! ● Keine Abhängigkeiten ● Direkt als Filter benutzbar ● Mäßige Erkennungsleistung cuneiform ● Von russ. Firma Cognitive Technologies ● Seit 2008 unter BSD-Lizenz ● Geforkte Kommandozeilen-Version ● verarbeitet gängige 1-Seiten-Bildformate ● Gute Erkennungsleistung ● Kann rtf-Dateien erzeugen → Textverarbeitung ● Erkennung für >20 (europäische) Sprachen tesseract ● 1985..1995 von HP entwickelt ● 2005 von Google überarbeitet und freigegeben ● Apache-Lizenz ● apt-get install tesseract-ocr tesseract-ocr-deu ● tesseract -l deu input.png outputbase hocr ● Gute Erkennungsleistung ● Ziemlich langsam hocr ● cuneiform und tesseract können hocr-Format erzeugen ● HTML mit Positionsinformationen ● Basis für layouterhaltende Weiterverarbeitung ● cuneiform → leider buggy ● Mehrere Konverter ● z.B. hocr2pdf aus exactimage OCRmyPDF ● https://github.com/fritz-hh/OCRmyPDF ● Version 2.0 brandneu ● Version 1.1 benutzt, geht mit wheezy und nach etwas Fummelei sogar mit squeeze ● tesseract aus wheezy: tw. kaputtes UTF-8 ● Patch mit Workaround ● OCRmyPDF input.pdf output.pdf ● Lieferte bei mit bessere Resultate als hocr2pdf .

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OCR Pwds and Assistive Qatari Using OCR Issue No
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