com.openkm.extractor

Class Tesseract3TextExtractor

java.lang.Object

com.openkm.extractor.AbstractTextExtractor

com.openkm.extractor.Tesseract3TextExtractor

All Implemented Interfaces:

TextExtractor, net.xeoh.plugins.base.Plugin

public class Tesseract3TextExtractor
extends AbstractTextExtractor

Text extractor for image documents. Use OCR from http://code.google.com/p/tesseract-ocr/

Constructor Summary

Constructors

Constructor and Description
Tesseract3TextExtractor() Creates a new TextExtractor instance.

Method Summary

Methods

Modifier and Type	Method and Description
String	doOcr(File tmpFileIn) Performs OCR on image file
String	doOcr(String ocr, File tmpFileIn) Performs OCR on image file
String	extractText(File input) Extract text from image using Tesseract OCR
String	extractText(InputStream stream, String type, String encoding) Returns a reader for the text content of the given binary document.
String	extractText(String ocr, File input) Extract text from image using Tesseract OCR
String	extractText(String ocr, InputStream stream, String type, String encoding)

Methods inherited from class com.openkm.extractor.AbstractTextExtractor

getContentTypes

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Tesseract3TextExtractor

public Tesseract3TextExtractor()

Creates a new TextExtractor instance.

Method Detail

extractText

public String extractText(InputStream stream,
                 String type,
                 String encoding)
                   throws IOException

Returns a reader for the text content of the given binary document. The content type and character encoding (if available and applicable) are given as arguments. The given content type is guaranteed to be one of the types reported by TextExtractor.getContentTypes() unless the implementation explicitly permits other content types.

The implementation can choose either to read and parse the given document immediately or to return a reader that does it incrementally. The only constraint is that the implementation must close the given stream latest when the returned reader is closed. The caller on the other hand is responsible for closing the returned reader.

The implementation should only throw an exception on transient errors, i.e. when it can expect to be able to successfully extract the text content of the same binary at another time. An effort should be made to recover from syntax errors and other similar problems.

This method should be thread-safe, i.e. it is possible that this method is invoked simultaneously by different threads to extract the text content of different documents. On the other hand the returned reader does not need to be thread-safe.

Parameters:

stream - binary document from which to extract text

type - MIME type of the given document, lower case

encoding - the character encoding of the binary data, or null if not available

Returns:

reader for the extracted text content

Throws:

IOException - on transient errors

extractText

public String extractText(File input)
                   throws IOException

Extract text from image using Tesseract OCR

Throws:

IOException

extractText

public String extractText(String ocr,
                 InputStream stream,
                 String type,
                 String encoding)
                   throws IOException

Throws:

IOException

extractText

public String extractText(String ocr,
                 File input)
                   throws IOException

Extract text from image using Tesseract OCR

Throws:

IOException

doOcr

public String doOcr(File tmpFileIn)
             throws IOException

Performs OCR on image file

Throws:

IOException

doOcr

public String doOcr(String ocr,
           File tmpFileIn)
             throws IOException

Performs OCR on image file

Throws:

IOException