fast-form 0.1.1

Automatically process scanned forms

fast-form

project from UniHack hackathon, helps to extract data from forms.

Installation

To use first install anaconda on your computer https://www.anaconda.com/

Then create conda environment with python 3.7.9 and poppler:

conda env create -f conda.yml -y
conda activate fast-form
pip install requirements.txt

Run

First create some folder and put there the pdfs you want to process. Then fill in the path_config.json file you have to have your template_file, configuration file, the folder where you have your scanned pdfs and finally path to excel you want to create the result sheet in (in case it does not exist it will be created)

Fist run

python process_to_validation_excel.py

it should create an excel in the data folder with the processed answers. Go through. The answers that seemed suspicious have pictures there to show you the answers. You can correct those. We use -1 for answers that had multiple crossed fields (or we think so) and -2 in case no field was crossed.

When you are satisfied, save the excel and run

python process_to_final_excel.py

which will create a sheet in the provided excel with the results

Development

Before development please run make setup Installing new dependencies added on remote

pip-sync

Adding dependencies:

add line to requirements.in and then run

pip-compile

Retrain model

We are using preparsed emnist dataset. https://www.kaggle.com/crawford/emnist

To retrain the model, you need to download it to training_data folder

fast-form
 - training_data
    - emnist-balanced-mapping.txt
    - emnist-balanced-train.csv
    - emnist-balanced-test.csv
    ...
 ...

and then first run field_recognizer/enrich_dataset.ipynb in jupyter notebook and after that use field_recognizer/emnist-neural-network.ipynb twice, once for type numbers, once for type letters (see inside of notebook )

Example form configuration - JSON

tests/form_for_test/config.json

Road map

priorities till 15.11.2020

Character Recognition

• retrain model on capital letters only
• enrich emnist dataset by different letter positioning
• use this notebook to improve the model https://www.kaggle.com/tarunkr/digit-recognition-tutorial-cnn-99-67-accuracy
• Add model for numbers
• Solve czech characters, either
  • find different dataset with czech diacritics
  • enrich emnist dataset by letters with diacritics
  • Add second clasifier, that would recognize diacritics / accute(') / carron(ˇ) / none /
  • Create our own, small dataset (maybe adding the diacritics to current dataset) and use methods here: https://arxiv.org/pdf/1904.08095.pdf
• (depends on something in section Model results processing) Create a model distinguishing X or filled circle or nothing or anomaly. Improve true/false computation for boxes

Refactoring

• Restructure repository to separate code from data
• Refactor to original emnist dataset structure instead of preparsed csv data from kaggle

Preprocessing

• smarter thresholding
• smarter corner classification
• completely drop corners, orient page based on the original file provided (fitting text on text)
• Improve just config so it centers boxes better and reponse 159 in PID1 is correctly parsed
• Change code to handle multiple pages somehow
• Better noise cancellation on the whole file
• Better noise cancellation on the level of the cropped boxes (important to do before cropping to the symbol area as it is broken by noise at the moment sometimes) many options how to approach, choose any
• Possibly (but maybe hard to do): remove bounding lines from figures.
• Speedup: the current matching teplate logic is simly tooo slow. Think what to do

• use other feature extraction method than SIFT (I have tried ORB which did not work well enough, but maybe after some tuning it would. it is way faster)
• do whathever else

• Saving of templates -> pickle is not working, but can be made working by https://stackoverflow.com/questions/10045363/pickling-cv2-keypoint-causes-picklingerror

Model results processing

• Implement logic around single choice forms return only single choice if there is only 1 true choice found, otherwise -1 (if no question answered) or -2 (if more than one question answered).
• Add to single choice logic also logic for filled in and anomaly circles.

Specific Questionnaire processing

• Prepare empty template that will have only header and some repeating thigs for PID, test how it works, potentially alter PID a bit, so it works for such empty template
• Prepare at the top of the first page space where one can fill in the patient code and add this to config as only number field

Configuration

• location of text via top left corner, bottom right corner plus number of letters
• Create a tool for config file creation

Packaging, proper output

• prepare for pdf with multiple questionnaires
• create config for the current questionnaire we are working on
• For the name of the patient use the name from questionnaire of question called patient_id. In case such question is not present, use the name of the pdf (as it is done now)
• Prepare python script that will process the scanned pdfs:

The program should get the following parameters from config file that will have to be existing in the folder:

- folder with scanned files (how should be new questionnaire recongized? new file for each?
- path to template document as pdf or jpg or something
- config file with location of answers in the template document via coordinates in pixels (see configuration above)

And it should output:

- excel file with the answers and their accuracies and also the parts of the original scan that were used for the recognition. 

• Prepare python script that will process the excel document with all the answers into an excel sheet. One questionnaire per line. params:

  • path to the excel with answers
  • path to the excel to put it in (if none, create new)
  • name of the sheet (if none create new) if the sheet is non empty put the data below the data already there

• Write readme

• Write nicer readme

• Create from this a package on pypi

• Test and especially let someone test on mac