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[Solved] tesseract ocr outputs empty files
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The_Document
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Joined: 03 Feb 2018
Posts: 266

PostPosted: Mon Mar 05, 2018 12:59 am    Post subject: [Solved] tesseract ocr outputs empty files Reply with quote

I have a lot of docs to ocr and I choose tesseract, heres some info:
Code:

[ Legend : U + final flag setting for installation]
[        : I + package is installed with flag     ]
[ Colors : set, unset                             ]
 * Found these USE flags for app+text/tesseract+3.05.01:
 U I
 + + doc         : Add extra documentation (API, Javadoc, etc). It is recommended to enable per package instead of globally
 + + examples    : Install examples, usually source code
 + + jpeg        : Add JPEG image support
 + + l10n_ar     : Arabic
 + + l10n_bg     : Bulgarian
 + + l10n_ca     : Catalan
 + + l10n_chr    : Cherokee
 + + l10n_cs     : Czech
 + + l10n_da     : Danish
 + + l10n_de     : German
 + + l10n_el     : Modern Greek
 + + l10n_es     : Spanish
 + + l10n_fi     : Finnish
 + + l10n_fr     : French
 + + l10n_he     : Hebrew
 + + l10n_hi     : Hindi
 + + l10n_hu     : Hungarian
 + + l10n_id     : Indonesian
 + + l10n_it     : Italian
 + + l10n_ja     : Japanese
 + + l10n_ko     : Korean
 + + l10n_lt     : Lithuanian
 + + l10n_lv     : Latvian
 + + l10n_nl     : Dutch
 + + l10n_no     : Norwegian
 + + l10n_pl     : Polish
 + + l10n_pt     : Portuguese
 + + l10n_ro     : Romanian
 + + l10n_ru     : Russian
 + + l10n_sk     : Slovak
 + + l10n_sl     : Slovenian
 + + l10n_sr     : Serbian
 + + l10n_sv     : Swedish
 + + l10n_th     : Thai
 + + l10n_tl     : Tagalog
 + + l10n_tr     : Turkish
 + + l10n_uk     : Ukrainian
 + + l10n_vi     : Vietnamese
 + + l10n_zh+CN  : Chinese (China)
 + + l10n_zh+TW  : Chinese (Taiwan)
 + + math        : Enable support for recognition of equations.
 + + opencl      : Enable opencl support for speedup using GPU computation.
 + + osd         : Enable support orientation and script detection.
 + + png         : Add support for libpng (PNG images)
 + + scrollview  : Install viewer to debug recognition (ScrollView).
 + + static+libs : Build static versions of dynamic libraries as well
 + + tiff        : Add support for the TIFF image format
 + + training    : Install training applications to add support for new languages.
 + + webp        : Enable support for webp image format.


I don't understand why it doesn't work, I run:

Code:
$ tesseract test.png out.txt
[DS] Profile read from file (tesseract_opencl_profile_devices.dat).
[DS] Device[1] 1:AMD CARRIZO (DRM 3.23.0 / 4.15.6-gentoo, LLVM 5.0.1) score is 0.595572
[DS] Device[2] 0:(null) score is 3.304872
[DS] Selected Device[1]: "AMD CARRIZO (DRM 3.23.0 / 4.15.6-gentoo, LLVM 5.0.1)" (OpenCL)
Tesseract Open Source OCR Engine v3.05.01 with Leptonica


it makes a file called out.txt and its empty, the ocr engine isn't working. How can I get it to work?


Last edited by The_Document on Mon Mar 05, 2018 7:09 am; edited 1 time in total
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blopsalot
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PostPosted: Mon Mar 05, 2018 6:13 am    Post subject: Reply with quote

i dont think it autodetects language.
Code:
tesseract imagename outputbase [-l lang] [--oem ocrenginemode] [--psm pagesegmode] [configfiles...]
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The_Document
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PostPosted: Mon Mar 05, 2018 6:23 am    Post subject: Reply with quote

blopsalot wrote:
i dont think it autodetects language.
Code:
tesseract imagename outputbase [-l lang] [--oem ocrenginemode] [--psm pagesegmode] [configfiles...]


I read somewhere the default is english if no language is specified and I was told to disable opencl support.
https://github.com/tesseract-ocr/tesseract/issues/1361
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blopsalot
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PostPosted: Mon Mar 05, 2018 6:36 am    Post subject: Reply with quote

makes sense, yeah i dont use it still.
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The_Document
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PostPosted: Mon Mar 05, 2018 7:08 am    Post subject: Reply with quote

Issue solved it works however after testing tesseract I found it a poor ocr engine, Im sure acrobat is more accurate.
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