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Great project! I've had success using camelot-py (https://camelot-py.readthedocs.io https://camelot-py.readthedocs.io) to extract tabular data from PDFs (for im

Great project! I've had success using camelot-py (https://camelot-py.readthedocs.io https://camelot-py.readthedocs.io) to extract tabular data from PDFs (for images, I use imagemagick to convert those to PDF). If your table has borders the default method (lattice) works quite well. For non-bordered table there is the option to use 'stream' option but usually requires bit more preprocessing to get usable results.

f430 6y ago
how does camelot extract tables from pdf? does it convert to image and then does OCR?
- mkl 6y ago
  From the link: "Camelot only works with text-based PDFs and not scanned documents." If you have character data, using it is almost always going to be more accurate than OCR. I don't know how OP uses it with images converted to PDFs though, as that would be just like a scan, and ImageMagick doesn't do OCR as far as I can tell.
  - punnerud 6y ago
    It uses pytesseract and Open-CV, so there is image processing.
    - mkl 6y ago
      Looks like it's a bit in-progress: https://github.com/camelot-dev/camelot/pull/209 https://github.com/camelot-dev/camelot/pull/209 "Update docs" isn't checked, and that's what I was going on.
      - vortex_ape 6y ago
        Yes I need to work on that PR, haven't been getting a lot of free time these days. It adds OCR support using EasyOCR, which I found on HN some time ago!
- vortex_ape 6y ago
  Hey! Camelot maintainer here. You can check out this doc for details on how Camelot extracts tables from PDFs: https://camelot-py.readthedocs.io/en/master/user/how-it-works.html https://camelot-py.readthedocs.io/en/master/user/how-it-work... As pointed out in this thread, right now it only works with text-based PDFs. But there's a PR[1] which will add OCR support (using EasyOCR) for image-based PDFs in some time. [1] https://github.com/camelot-dev/camelot/pull/209 https://github.com/camelot-dev/camelot/pull/209
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f430 6y ago

how does camelot extract tables from pdf? does it convert to image and then does OCR?

mkl 6y ago
From the link: "Camelot only works with text-based PDFs and not scanned documents." If you have character data, using it is almost always going to be more accurate than OCR. I don't know how OP uses it with images converted to PDFs though, as that would be just like a scan, and ImageMagick doesn't do OCR as far as I can tell.
- punnerud 6y ago
  It uses pytesseract and Open-CV, so there is image processing.
  - mkl 6y ago
    Looks like it's a bit in-progress: https://github.com/camelot-dev/camelot/pull/209 https://github.com/camelot-dev/camelot/pull/209 "Update docs" isn't checked, and that's what I was going on.
    - vortex_ape 6y ago
      Yes I need to work on that PR, haven't been getting a lot of free time these days. It adds OCR support using EasyOCR, which I found on HN some time ago!
vortex_ape 6y ago
Hey! Camelot maintainer here. You can check out this doc for details on how Camelot extracts tables from PDFs: https://camelot-py.readthedocs.io/en/master/user/how-it-works.html https://camelot-py.readthedocs.io/en/master/user/how-it-work... As pointed out in this thread, right now it only works with text-based PDFs. But there's a PR[1] which will add OCR support (using EasyOCR) for image-based PDFs in some time. [1] https://github.com/camelot-dev/camelot/pull/209 https://github.com/camelot-dev/camelot/pull/209

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