[jira] [Commented] (TIKA-2696) Support output of Tesseract OSD output for psm mode 0

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[jira] [Commented] (TIKA-2696) Support output of Tesseract OSD output for psm mode 0

Tim Allison (Jira)

    [ https://issues.apache.org/jira/browse/TIKA-2696?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16643695#comment-16643695 ]

ASF GitHub Bot commented on TIKA-2696:

gdubicki commented on issue #246: TIKA-2696 Add support for OSD output, contributed by @4U6U57
URL: https://github.com/apache/tika/pull/246#issuecomment-428258530
   Hi @tballison , can you please re-review after the tests were added?

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> Support output of Tesseract OSD output for psm mode 0
> -----------------------------------------------------
>                 Key: TIKA-2696
>                 URL: https://issues.apache.org/jira/browse/TIKA-2696
>             Project: Tika
>          Issue Type: Improvement
>          Components: ocr
>            Reporter: August Valera
>            Priority: Minor
> TIKA-2357 added support for additional PSM (page segmentation modes) for Tesseract OCR, including mode 0, which is {{Orientation and script detection (OSD) only}}, meaning it does not perform OCR, just outputs orientation and script information.
> An example usage of mode 0:
> {code:java}
> $ tesseract infile.png outfile --psm 0 -l osd
> {code}
> In this mode, the usual {{outfile.txt}} is not created. Instead, and similar to other modes that run OSD in addition to extraction, the result is an {{outfile.osd}} file, like so:
> {code:java}
> Page 1
> Warning. Invalid resolution 0 dpi. Using 70 instead.
> Estimating resolution as 212
> Page number: 0
> Orientation in degrees: 0
> Rotate: 0
> Orientation confidence: 13.73
> Script: Latin
> Script confidence: 4.78
> {code}
> However, {{TesseractOCRParser#parse(...)}} is [coded|https://github.com/apache/tika/blob/master/tika-parsers/src/main/java/org/apache/tika/parser/ocr/TesseractOCRParser.java#L437] to only read the contents of {{outfile.txt}} (alternatively {{outfile.hocr}}) in all modes, so mode 0 outputs nothing regardless of input.
> This is consistent with Tika's goal to output extracted text, but against the intention of the user expecting OSD output.

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