All-caps, small-caps

[bácsi Kazi]

Hi there!

I'm playing with Tesseract 3.02, and I would need precise recognition of capital letters. Unfortunately my files are full of all caps and small caps. During the training if I included such words in the sample, I got random capitals in the rest of the text. I thought I would try to put them into a new font, same. I included them in the dictionary files, somewhat better, but still problematic at letter o, u, v etc. I.e. HELLo WoRLD & friends, despite having HELLO WORLD in dictionary.
It's quite similar to this:
https://code.google.com/p/tesseract-ocr/issues/detail?id=691
What is your experience? How to train Tesseract for caps? Is it better in later versions? Is there a configuration parameter to set?
Thanks!

Kazi

[bácsi Kazi]

Could you help? Have I missed something blatantly trivial?

Any help would be highly appreciated!

Kazi

[zdenko podobny]

When you ask for support please provide example files.

Did you try the latest version of tesseract?

Zdenko

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[bácsi Kazi]

Dear Zdenko,

I provide an example file in attachment. You can see Enrico, Antonio, Roberto in the output with this mistake, despite all these names are present in the dictionary with all-caps.

I haven't tried later versions, because you have a policy of not providing Windows installers, and I was busy with other programming. But if you say it's worth it, I'll try. Is there any guide how to create a portable version for Windows?

Thanks again!

Kazi

[zdenko podobny]

First of all - there is no such policy as not providing Windows installers.  There is no installer because there is nobody who would maintain it and provide solution (e.g. NSIS destroys my PATH variable on windows ;-) ). Everybody is busy with programming :-) (something else).

Next: there is windows build based on cygwin, so if you need windows portable version you get it (search this forum).

Next in attachment you can find output created with current tesseract code created with:

    tesseract example.png example -l spa

(I renamed your file and I hope I chose correct language for OCR). It seem that result is better than yours including capitalization. 

IMO tesseract executable is nice example how to use tesseract library. Maybe you should try to use tesseract library directly

Zdenko

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[bácsi Kazi]

Dear Zdenko!

Thank you for your reply! Even though the original file was in Italian, your output is quite impressive!

I found a guide how to compile with CygWin: http://vorba.ch/2014/tesseract-cygwin.html

So I installed CygWin64 with the necessary packages, then everything went fine with Leptonica, but I screwed up with Tesseract. During make when processing ccutil/ambigs.cpp it lacks the strtok_r.h file, but it's in the vs2010/port folder (if I place it there it finds it ambiguous). I used: CPPFLAGS="-I/usr/local/include" LDFLAGS="-L/usr/local/lib" ./configure because of my Leptonica installation.

So I can't get even a "normal" installation, not to mention the one written here: https://github.com/tesseract-ocr/tesseract/wiki/Compiling

I'm not familiar with this stuff - that's why I was asking an installer (couldn't find the one you were referring to).

I couldn't get either that you have suggested exactly in your last line.

Greetings:

Kazi

[ShreeDevi Kumar]

On cygwin Marco Atzeri has packaged Tesseract as well as the training utilities for 3.04.00 along with some training data. Instruction for cygwin installation is here: https://cygwin.com/cygwin-ug-net/setup-net.html

Tesseract specific packages to be installed:

tesseract-ocr                           3.04.00-2
tesseract-ocr-eng                       3.04-1
tesseract-training-core                 3.04-1
tesseract-training-eng                  3.04-1
tesseract-training-util                 3.04.00-2

ShreeDevi
____________________________________________________________
भजन - कीर्तन - आरती @ http://bhajans.ramparivar.com

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[bácsi Kazi]

Thanks!

Eventually the issue was this: https://groups.google.com/forum/#!msg/tesseract-ocr/FSURCa9m7Ko/

So I suppose the files from the download page resulted the error, but the newer files on Git work well when building Tesseract on Cygwin.

Greetings:

Kazi