UB-Mannheim / ocrd_pagetopdf

OCR-D wrapper for prima-pagetopdf

ocrd-pagetopdf

OCR-D wrapper for prima-page-to-pdf

Transforms all PAGE-XML+IMG to PDF with text layer and (optionally) polygon outlines.

(Converts original images together with text and layout annotations of all pages in the PAGE input file group to PDF. The text is rendered as an overlay.)

Requirements

• GNU make
• Python 3 with pip and venv
• OCR-D
• Java runtime (OpenJDK 8 works for PageToPdf 1.1.2)

Installation

Once you have installed Java, make, Python, and set up your virtual environment, do:

make deps # or: pip install ocrd
make install # copies into PREFIX or VIRTUAL_ENV

Usage

The command-line interface conforms to OCR-D processor specifications.

Assuming you have an OCR-D workspace in your current working directory, simply do:

ocrd-pagetopdf -I PAGE-FILGRP -O PDF-FILEGRP -p '{"textequiv_level" : "word"}'

This will run the script and create PDF files for each page with a text layer based on word-level annotations.

There is also an option to create an additional multipage file with name merged.pdf, which contain all single pages in correct order:

ocrd-pagetopdf -I PAGE-FILGRP -O PDF-FILEGRP -p '{"textequiv_level" : "word", "multipage":"merged"}'

FAQ

• Illegal reflective access by com.itextpdf.text.io.ByteBufferRandomAccessSource$1 to method java.nio.DirectByteBuffer.cleaner() If that appears, try installing OpenJDK 8.

• java.lang.NullPointerException If that appears, try (a little workaround) and set negative coordinates to zero:

  ocrd-pagetopdf -I PAGE-FILGRP -O PDF-FILEGRP -p '{"textequiv_level" : "word", "negative2zero": true}'
  

• Some letters are illegible? Please note that the standard displayed font (AletheiaSans.ttf) does not support all Unicode glyphs. In case yours are missing, set a (monospace) Unicode font yourself:

  ocrd-pagetopdf -I PAGE-FILGRP -O PDF-FILEGRP -p '{"textequiv_level" : "word", "font": "/usr/share/fonts/truetype/ubuntu/UbuntuMono-R.ttf"}'
  

• The multipage file pagelabelnames can be changed, e.g. consecutively pagenumber.

  ocrd-pagetopdf -I PAGE-FILGRP -O PDF-FILEGRP -p '{"textequiv_level" : "word", "multipage":"merged", "pagelabelname":"pagenumber"}'