A tool for extracting tables, figures, maps, and pictures from PDFs using Tesseract
If you are using MacOS you can install the dependencies as so:
brew install ghostscript parallel tesseract
Next, install the Python dependencies:
pip install -r requirements.txt
Assuming you have a document named my_doc.pdf, you can prepare it for processing and extract tables as so:
./preprocess.sh ./my_doc_processed ./my_doc.pdf
python do_extract.py ./my_doc_processedThis will extract tables and figures to ./my_doc_processed/tables. The first command will parse the PDF into the necessary directory structure and create the necessary data products for Tesseract. The second will extract tables.
Script for prepping a PDF for table extraction. Converts each page of the PDF to a PNG with Ghostscript, then runs the PNGs through Tesseract. Also runs each page through annotate.py to assist in debugging. Assumes local installation of tesseract-ocr.
./preprocess.sh ./my_document_processed my_document.pdf
This creates the file structure necessary for extraction:
document_name
annotated (pngs of what tesseract sees)
png (each page of the PDF as a PNG image)
tables (extractions)
tesseract (HTML for each page produced by tesseract)
orig.pdf (The original document)
text.txt (The extracted text layer)
Development supported by NSF ICER 1343760
MIT