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https://issues.apache.org/jira/browse/TIKA-93?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13896483#comment-13896483
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Luis Filipe Nassif commented on TIKA-93:
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I have tried Tess4J a few months ago. The main problem was JVM crashes with
some kinds of images, probably related with native code execution. So I changed
to the Tesseract exec approach, that obviously did not cause JVM crashes. But
the OCRing of a few images never terminates and some timeout control was
necessary, like for other existing Tika parsers.
> 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
> Attachments: TIKA-93.patch, TIKA-93.patch, TIKA-93.patch,
> TIKA-93.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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