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https://issues.apache.org/jira/browse/TIKA-93?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13937753#comment-13937753
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Luis Filipe Nassif commented on TIKA-93:
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Hi Chris,
I noticed ExternalParser before. It would be very good to leverage it to start
the OCR process, but Tesseract appends ".txt" to output filename and needs the
environment variable TESSDATA_PREFIX to be setted up. Maybe updating
ExternalParser to support an output filename suffix may be needed? And I tried
to extend Grant's work, implementing OCRParser interface, so TesseractParser
could also be used for images embedded into PDFs. Could that be done by
leveraging ExternalParser?
> OCR support
> -----------
>
> Key: TIKA-93
> URL: https://issues.apache.org/jira/browse/TIKA-93
> Project: Tika
> Issue Type: New Feature
> Components: parser
> Reporter: Jukka Zitting
> Assignee: Chris A. Mattmann
> Priority: Minor
> Fix For: 1.6
>
> Attachments: TIKA-93.patch, TIKA-93.patch, TIKA-93.patch,
> TIKA-93.patch, TesseractOCRParser.patch, TesseractOCRParser.patch,
> testOCR.docx, testOCR.pdf, testOCR.pptx
>
>
> I don't know of any decent open source pure Java OCR libraries, but there are
> command line OCR tools like Tesseract
> (http://code.google.com/p/tesseract-ocr/) that could be invoked by Tika to
> extract text content (where available) from image files.
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