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tessdata_ocrb

traineddata for MRZ using OCR-B fonts

This is a proof of concept traineddata in response to this post in tesseract-ocr forum

Feel free to clone the repo and rerun training with your own custom training_text and fonts.

Update: April 15, 2019

Retrained to add missing X using 3 OCRB fonts and a larger training text compared to previous version. Both float/best and integer/fast versions are provided.

Trained by plus finetuning tessdata_best/eng.traineddata

(800 iterations - char train=0.273%, word train=3.47%, word train=0%)

Evaluation

ocrb_eval folder has synthetic MRZ samples in the same 3 fonts for evaluation. The box/tiff pairs are also saved.

  • lstmeval of the files with tessdata_best/eng gives Eval Char error rate=44.954738, Word error rate=89.583333.
  • lstmeval of the files with ocrb and ocrb_int gives Eval Char error rate=0, Word error rate=0.

Test

tesseract ./ocrb_eval/eng.OCR-B_10_BT.exp0.tif - -l ocrb --tessdata-dir ./

Failed to load any lstm-specific dictionaries for lang ocrb!!
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Other projects

There are other github repos with MRZ solutions (I have not tried them).