nrtyck/erpnext_ocr

:snake: :alembic: Optical Character Recognition using tesseract within Frappe.

ERPNext OCR

⚗️ Experimental Frappe OCR application with tesseract.

This project is a fork of ERPNext-OCR by John Vincent Fiel. Its aim is to fix and cleanup the original source code and add some new features.

Check out more on ERPNext Discuss.

📈 Changes

See CHANGELOG

🔖 Roadmap

See Taiga.io

🚧 Install

Pre-requisites: tesseract-python and imagemagick

Install tesseract-ocr, plus imagemagick and ghostscript (to work with pdf files) using this command on Debian:

sudo apt-get install tesseract-ocr imagemagick libmagickwand-dev ghostscript

Install Frappe application

bench get-app --branch develop erpnext_ocr https://github.com/Monogramm/erpnext_ocr
bench install-app erpnext_ocr

When installing Frappe app, the following python requirements will be installed:

• python binding for tesseract, tesserocr

• image processing library in python, pillow

• HTTP library in python, requests

• python binding for imagemagick, wand

🚀 Usage

File Being Read:

Sample Screenshot:

Tesseract trained data

In order to use OCR with different languages, you need to install the appropriate trained data files. Check tesseract Wiki for details: https://github.com/tesseract-ocr/tesseract/wiki/Data-Files

Development

If you wish to develop or just test locally this application, you can use docker-compose up -d at the root of the this repository. You can then access your ERPNext OCR dev env at http://localhost:8080.

Known issues

• wand.exceptions.PolicyError: not authorized '/opt/sample.pdf' @ error/constitute.c/ReadImage/412

  • This can happen due to security configuration in imagemagick preventing it to read PDF files.

  • Reference:

    • https://stackoverflow.com/questions/52699608/wand-policy-error-error-constitute-c-readimage-412
    • https://stackoverflow.com/questions/42928765/convertnot-authorized-aaaa-error-constitute-c-readimage-453

• wand.exceptions.WandRuntimeError: MagickReadImage returns false, but did raise ImageMagick exception. This can occurs when a delegate is missing, or returns EXIT_SUCCESS without generating a raster.

  • This might happen if you're missing a dependency to convert PDF, most of the time ghostscript

  • References:

    • https://stackoverflow.com/questions/57271287/user-wand-by-python-to-convert-pdf-to-jepg-raise-wand-exceptions-wandruntimeerr

• OSError: encoder error -2 when writing image file

  • This might happen when trying to open a TIFF image, but the real error is "hidden" and only displayed in console.
  • If the original error in console is Fax3SetupState: Bits/sample must be 1 for Group 3/4 encoding/decoding. that usually happens when TIFF image compression is not valid / recognized.

✅ Run tests

bench run-tests --app erpnext_ocr

👤 Authors

Monogramm

• Website: https://www.monogramm.io
• Github: @Monogramm

John Vincent Fiel

• Github: @jvfiel

🤝 Contributing

Contributions, issues and feature requests are welcome!
Feel free to check issues page. Check the contributing guide.

👍 Show your support

Give a ⭐ if this project helped you!

📄 License

Copyright © 2019 Monogramm.
This project is MIT licensed.

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