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May 2021

German (Deutsch)

Mustertraining

Enthält Ihr zu erkennendes Dokument Zierschriften oder Sonderzeichen (z. B. mathematische Symbole), die dem Programm unbekannt sind, empfehlen wir zur Verbesserung der OCR-Genauigkeit die Verwendung von Mustertraining Muster werden durch das Zuordnen von Bildern von Zeichen im Text zu ihren jeweiligen Tastaturgegenstücken. Dies geschieht durch das einfache Drücken der Nach-rechts-Taste auf der Tastatur, sobald das Programm ein Zeichenbild angibt, das es nicht erkennen kann. Es kann vorkommen, dass Sie dasselbe Zeichen mehrmals bestätigt müssen, da der Computer feinere Unregelmäßigkeiten zwischen den Zeichenbildern erkennt, die für das bloße Auge nicht wahrnehmbar sind. Dies wird Mustertraining genannt und untermauert wirksam den Bezug zwischen den Gruppen von Zeichenbildern und deren Tastaturgegenstücken.

Es ist nicht ratsam, den Trainingsmodus in anderen Fällen zu verwenden, da die OCR-Qualität im Vergleich zum Aufwand für das Training nur unwesentlich verbessert wird.

Das Mustertraining wird für asiatische Sprachen nicht unterstützt.

Im Trainingsmodus wird ein Muster erstellt, das während des OCR-Vorgangs für den gesamten Text verwendet werden kann.

Sie möchten vielleicht Ihr neu erstelltes Muster vor dem Start des OCR-Vorgangs noch einmal bearbeiten. Ein falsch trainiertes Muster kann die OCR-Qualität beeinträchtigen. Das Muster sollte nur vollständige Zeichen oder Ligaturen enthalten. Zeichen mit abgeschnittenen Kanten und Zeichen mit falschen Buchstabenpaarungen sollten aus dem Muster entfernt werden.

Erstellen und Bearbeiten von Mustern

Trainingsmuster

So testen Sie ein Benutzermuster für die Erkennung neuer Zeichen und Ligaturen:

Klicken Sie auf Werkzeuge > Mustertraining).
Trifft das Programm auf ein Zeichen oder auf eine Ligatur, das/die nicht erkannt werden kann, wird das Dialogfeld Mustertraining angezeigt, in dem das Bild des unbekannten Zeichens der unbekannten Ligatur enthalten ist.

Drücken Sie auf das entsprechende Zeichen oder auf die Zeichenfolge auf der Tastatur.

Ligaturen sind Reihenfolgen von zwei oder drei Zeichen, die so dicht beieinander gedruckt sind, dass sie für das Programm als ein Zeichen erscheinen.
Wenn Sie die Texteffekte beibehalten möchten, wählen Sie den benötigten Texteffekt (z. B. kursiv, fett, hochgestellt oder tiefgestellt) aus der Optionsgruppe Effekte.
Mit fortschreitendem Training von einem unerkannten Zeichen zum nächsten können Sie zum zuvor trainierten Zeichenbild zurückkehren, indem Sie auf Zurück klicken. Der Rahmen wird zum vorherigen Zeichenbild verschoben und die neueste "Zeichenbild/Tastaturzeichen"-Zuordnung wird verworfen. Die SchaltflächeZurück funktioniert nur innerhalb des aktuellen Wortes und geht nicht weiter zurück als dessen erster Buchstabe.

Sobald Sie fertig sind, klicken Sie auf Schließen. Das Programm wird Sie fragen, ob die Trainingsergebnisse gespeichert werden sollen. Klicken Sie auf Ja.
Es wird ein neuer OCR-Vorgang gestartet, bei dem das Programm die neu trainierten Muster verwendet.
Prüfen Sie den erkannten Text, sobald das OCR abgeschlossen ist. Wurde eines der Zeichen falsch erkannt, klicken Sie auf die Schaltfläche Mustertraining fortsetzen.
Um den Modus Mustertraining zu beenden, klicken Sie auf die Schaltfläche Muster speichern und Training beenden.

Wichtig! Muster können nur für Zeichen des Alphabets trainiert werden, das im Text verwendet wird. Ist für eine Ligatur oder ein Zeichen keine entsprechende Taste auf der Tastatur vorhanden, können Sie entweder hintereinander die zwei Tasten drücken, aus denen die Ligatur besteht, oder klicken Sie auf die Schaltfläche und wählen Sie im Dialogfeld Zeichen einfügen das benötigte Zeichen aus.

Wichtig! Ein Muster kann bis zu 1.000 neue Zeichen enthalten. Beachten Sie jedoch, dass eine zu große Anzahl von Ligaturen in einem Muster die Qualität der OCR negativ beeinträchtigen kann.

Wichtige Dinge, die Sie über das Mustertraining wissen sollten

Die OCR-Engine macht keinen Unterschied zwischen bestimmten Zeichenbildern und ordnet sie ein und demselben Tastaturzeichen zu. Beispiel: gerade Apostrophe ('), linke einfache Anführungszeichen (‘) und rechte einfache Anführungszeichen (’) werden alle dem Tastaturzeichen gerades Apostroph zugeordnet. Das bedeutet, linke und rechte Anführungszeichen werden in erkannten Texten in keinem Fall reproduziert, selbst wenn Sie die jeweiligen Tastaturzeichen im Modus Mustertraining eingeben.
Bei bestimmten Zeichenbildern wählt die OCR-Engine die Tastaturgegenstücke auf der Basis des größeren Kontexts aus. Beispiel: Das Bild eines Kreises könnte entweder eine Null oder der Buchstabe O sein und die OCR-Engine wählt zwischen den zwei Alternativen, indem die benachbarten Zeichen berücksichtigt werden. Ist der Kreis von Ziffern umgeben, entscheidet das Programm zugunsten der Null, ansonsten wird der Kreis als der Buchstabe O interpretiert.
Ein trainiertes Muster kann nur für das Erkennen von Text verwendet werden, der mit der gleichen Schriftart und Schriftgröße gedruckt und mit der gleichen Auflösung wie das Bild gescannt wurde, mit dem das Muster trainiert wurde.

Siehe auch:

Dokumentsprachen angeben

26.03.2024 13:49:48

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