Roman created TIKA-4270:
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Summary: wrong skew angle in tika-parser-ocr-module
Key: TIKA-4270
URL: https://issues.apache.org/jira/browse/TIKA-4270
Project: Tika
Issue Type: Bug
Affects Versions: 2.9.1
Reporter: Roman
Attachments: for_issue
We use tika to extract text from different sources, including images with text
that is rotated at a certain angle. To extract text from image with ocr, tika
first deskew image. The skew angle is not calculated correctly. In example
[^for_issue] , the text is rotated at an angle of ~40 degrees. But the skew
angle function (org.apache.tika.parser.ocr.tess4j.ImageDeskew#getSkewAngle)
returns an angle of about 15. The slope angle calculation flag is enabled.
The documentation
(https://cwiki.apache.org/confluence/display/TIKA/TikaOCR#:~:text=To%20identify%20rotation)
does not have sufficient information for this version of tika, there is a todo
box and some relevant information for tika 1 (requires python and its
libraries, but in the version of tika we use, angle calculations are
implemented only using java)
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