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CORE: Sophisticated PDFReader with Image and Table extraction #127

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janaka opened this issue Oct 16, 2023 · 1 comment
Open

CORE: Sophisticated PDFReader with Image and Table extraction #127

janaka opened this issue Oct 16, 2023 · 1 comment

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@janaka
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janaka commented Oct 16, 2023 •
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Current

The LlamaIndex PDFReader (part of the SimpleDirectoryReader) currently only handles simple (naive) text extraction. It uses the pypdf package. It iterates through pages (pypdf.pdfreader.pages) then uses the page.extract_text() method to grab to text for the document.

The following are ignored:

  • Images
  • Tables
  • PDF Metadata
  • Document structure such as headings

We should be able to improve retrieval by extracting information present in these components

Solution

Fork the standard LlamaiIndex PDFReader and customise it. Look into the various LlamaIndex Image readers.

Alternatives

Use readers from Unstructured.io
@janaka
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janaka commented Oct 23, 2023

Also look into LayoutPDFReader by LLMSherpa

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@janaka