Adding New Fonts to Tesseract 3

Question

I'm trying to add new fonts to tesseract ocr. I'm following this tutorial but I'm having some problems.

Here's what I've done so far:

1. Create training document

   convert eng.myfont.exp0.pdf eng.myfont.exp0.tif

2. Train Tesseract

   tesseract eng.myfont.exp0.tif eng.myfont.exp0 batch.nochop makebox

   This created my eng.myfont.exp0.box file.

   I open the file with moshpytt and make sure it was detected correctly.

3. Feed the box file back into tesseract

   tesseract eng.myfont.exp0.tif eng.myfont.exp0.box nobatch box.train.stderr

   I have this result:

   Tesseract Open Source OCR Engine v3.03 with Leptonica
   APPLY_BOXES:
   Boxes read from boxfile: 146
   Found 146 good blobs.
   TRAINING ... Font name = myfont.exp0
   Generated training data for 6 words

   • eng.myfont.exp0.box.tr file and eng.myfont.exp0.box.txt generated

4. try to detect the Character set used in the box file (this is where I get stuck)

   unicharset_extractor *.box

Result:

unicharset_extractor: command not found

I also tred unicharset_extractor eng.myfont.exp0.box with the same result.

I'm using:

• tesseract 3.03
• leptonica-1.70
• libgif 4.1.6(?) : libjpeg 8d : libpng 1.2.50 : libtiff 4.0.3 : zlib 1.2.8 : webp 0.4.0
• Ubuntu 14.04.1 LTS

Answer 1

The training tools for Tesseract 3.03 RC were omitted from Ubuntu 14.04. So either fall back to Tesseract 3.02 or upgrade to Ubuntu 14.10, which should have it.

Answer 2

Ok, I googled this for you. Here's the answer:

You need to run all commands in the same folder where are located your input files.

From:

• https://code.google.com/p/tesseract-ocr/issues/detail?id=945 and
• https://code.google.com/p/tesseract-ocr/wiki/TrainingTesseract3#Background_and_Limitations