Tesseract returns empty result with custom language but not english

[Brennan Nunamaker]

Hello,

I just generated the traineddata file for an old historical version of latin text, but when I run tesseract on the .tif that I used to train tesseract for the language (as well as with other sample images), it returns an empty result. However, when I use the English language for classification, it generates text with a few errors due to a lack of recognition for some specific characters. (Meaning that the fault lies with the traineddata and not the samples I am running it on)

Why could this be? I have been struggling to even generate the traineddata, and ended up using a fairly short training text (see attachment). Do I need to use a longer training text/tif?

If anyone could point me in the right direction I would be extremely grateful.

Thanks in advance!
-Brennan

[ShreeDevi Kumar]

Did you try with the Latin traineddata 

https://github.com/tesseract-ocr/tessdata/blob/master/lat.traineddata?raw=true

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

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[Brennan Nunamaker]

I need to use my own trained data, because in the future we will be using it on text that has no trained data, so we will have to generate it ourselves. If I don't understand what I am doing wrong, I won't be able to...

Thank you anyway

[Brennan Nunamaker]

For clarification: With "text", I meant languages

[ShreeDevi Kumar]

Please see https://github.com/tesseract-ocr/langdata/tree/master/lat

which has the language data used for latin. You can use this as the basis to create your own traineddata file for an old historical version of latin 

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

To view this discussion on the web visit https://groups.google.com/d/msgid/tesseract-ocr/71c3b314-ff5f-4387-bf5f-ffc2cc6d2875%40googlegroups.com.

[ShreeDevi Kumar]

You may also find it helpful to read Training Tesseract for Ancient Greek OCR by Nick White -  http://ancientgreekocr.org/e29-a01.pdf 

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

[Brennan Nunamaker]

This is very helpful, thank you!

[ShreeDevi Kumar]

You may also want to see the latest code and the tesstrain.sh script for the newer developments in training at

https://github.com/tesseract-ocr/tesseract/tree/master/training

Also see the release history on http://ancientgreekocr.org/

since Nick updated the software for the changes in tesseract - the article is older.

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

To view this discussion on the web visit https://groups.google.com/d/msgid/tesseract-ocr/18f2c8de-df85-4afa-9aaf-e9d5be47862c%40googlegroups.com.

[Tom Morris]

Be sure to check https://github.com/tesseract-ocr/langdata before assuming that the language that you need isn't supported.  Dozens of new languages were added a couple of weeks ago.

Tom