The tool uses a multi-stage algorithm to determine the reading order:
- Elementary Sorting: Parsing the underlying document flow order based on the Poppler library
- typology::
- Header elements are prioritized (keeping the internal original order)
- Main content (text/tables, etc.) reordered for visual reading habits
- Mandatory posting of footers and footnotes
- visual correction: for non-text elements (e.g., images), the nearest text element is associated with the location.
Technology Optimization: Solve common PDF problems such as multi-column layout and floating objects through visual grid analysis (VGT core competency). For scanned documents, secondary layout analysis is performed after OCR is completed to enhance sequential accuracy.
Hands-on advice: If anomalies in the order are found, the /visualize interface can be used to generate annotated PDFs for manual calibration, or to adjust the model parameters for re-analysis.
This answer comes from the articleAutomatically parse PDF content and extract text and tables of open source servicesThe
May not be reproduced without permission:AI productivity tools " How does the tool determine the reading order of PDF elements? What are the optimization mechanisms?
