poor tesseract training

[Lada Tylich]

Hi to All!

I try to train tesseract to "computer-like" and "digital-like" fonts (rugsnatcher-demo and levi-adobe-dia in particular). I kept the training recommendations for image preprocessing, changing box file using qt-box-editor, spaces between characters. But despite these I got fails when I put the trainign command (e.g. tesseract eng.rugsnatcher_demo.exp0.tif eng.rugsnatcher_demo.exp0 box.train). In some cases I got through but finally at combine_tessdata procedure (Error: traineddata file must contain at least (a unicharset fileand inttemp) OR an lstm file.).

Editing box files seems totally useless to me since changing 1 "failing" character (that is correct btw) makes even more fails during training.

I have already tried another font sf_digital_readouts. Considering this, training was successful only for few characters, but when I put there paragraph of text I got some Fails as well. 

I am stuck at this few weeks but I am not able to make good results for this.  I am curious what am I missing? Is it possible to teach tesseract these fonts or should I take another approach?

Thank you for any response!

[ShreeDevi Kumar]

If you have the font files, best way to do training is to use tesseract-ocr/tesseract/training/tesstrain.sh - it will create the box/tiff pairs and the resulting .lstmf files (for 4.0 alpha training) or .tr files (for 3.0x training).

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

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[Lada Tylich]

Thanks for answer.

I ran the command (tesstrain.sh). It was able to generate training images but it failed during generating unicharset and unichar properties files:

Invalid Unicode codepoint: 0xffffffc2

IsValidCodepoint(ch):Error:Assert failed:in file normstrngs.cpp, line 225

ERROR: /tmp/tmp.TW7Mm4rzdo/eng/eng.unicharset does not exist or is not readable

I checked that it can relate to some older commits but I got them already. I try to find where is problem.

Do you know what else can cause the issue?

 

[Lada Tylich]

btw: I use tesseract commit 1b0379c

[Lada Tylich]

and I tried different fonts and English language, so there should not be issues like here.

[Lada Tylich]

So please, referring to my previous comments, do you have some ideas? I am stuck again :/