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Investigating OCR and Text PDFs from Digital Collections

bibwild.wordpress.com · published 18 July 2023

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https://digital.sciencehistory.org/
digital.sciencehistory.org
https://archive.org/details/birdbookillustra00reedrich/page/229/mode/1up?view=theater&q=owl
archive.org
https://d.lib.ncsu.edu/collections/catalog/ua100_016-003-bx0020-001-000
d.lib.ncsu.edu
https://ia803406.us.archive.org/16/items/birdbookillustra00reedrich/birdbookillustra00reedrich.pdf
ia803406.us.archive.org
https://www.youtube.com/watch?v=DqA1YPfDlhg
youtube.com
https://en.wikipedia.org/wiki/HOCR
en.wikipedia.org
https://tesseract-ocr.github.io/
tesseract-ocr.github.io
https://aws.amazon.com/textract/
aws.amazon.com
https://github.com/internetarchive/archive-pdf-tools
github.com
https://github.com/internetarchive/archive-pdf-tools/issues/63
github.com
https://github.com/internetarchive/archive-pdf-tools/issues/64
github.com
https://en.wikipedia.org/wiki/Mixed_raster_content
en.wikipedia.org
https://github.com/internetarchive/archive-pdf-tools/issues/51
github.com
https://github.com/ocropus/hocr-tools
github.com
https://github.com/eloops/hocr2pdf
github.com
https://exactcode.com/opensource/exactimage/
exactcode.com
https://rubygems.org/gems/pdfbeads
rubygems.org
https://github.com/tesseract-ocr/tesseract
github.com
https://en.wikipedia.org/wiki/CuneiForm_(software
en.wikipedia.org
Tesseract 4 is here! State of the art OCR in R! Read at the source ↗
ropensci.org
https://tesseract-ocr.github.io/tessdoc/Data-Files-in-different-versions.html
tesseract-ocr.github.io
https://github.com/tesseract-ocr/tesstrain
github.com
https://github.com/cneud/ocr-conversion
github.com
https://aws.amazon.com/textract/pricing/
aws.amazon.com
https://cloud.google.com/vision/docs/ocr
cloud.google.com
https://www.neweditions.net/sites/default/files/product-sample-files/QuickGuideforAccessiblePDF.pdf
neweditions.net
https://github.com/kba/hocrjs
github.com
https://youtu.be/DqA1YPfDlhg?t=381
youtu.be
https://github.com/not-implemented/hocr-proofreader
github.com
https://www.not-implemented.de/hocr-proofreader/
not-implemented.de
https://github.com/internetarchive/archive-hocr-tools
github.com
https://github.com/internetarchive/archive-hocr-tools/blob/master/bin/pdf-to-hocr
github.com
https://stackoverflow.com/questions/11412802/pdf-and-text-layer/11418938
stackoverflow.com
https://github.com/tesseract-ocr/tesseract/blob/main/tessdata/pdf.ttf
github.com
https://github.com/tesseract-ocr/tesseract/issues/712
github.com
https://github.com/kba/hocr-spec/issues/17
github.com
https://en.wikipedia.org/wiki/ALTO_(XML
en.wikipedia.org
https://queiroz.divp.org/papers/ei99mrc.pdf
queiroz.divp.org
https://www.pdfblog.at/2022/02/pdfcompressor-pdf-mrc-mixed-raster-content-compression-reduce-document-color-scans-by-a-factor-of-8-to-10/?lang=en
pdfblog.at
https://www.gdpicture.com/blog/advanced-mrc-compression/
gdpicture.com
https://archive-pdf-tools.readthedocs.io/en/latest/
archive-pdf-tools.readthedocs.io
https://youtu.be/DqA1YPfDlhg?t=1278
youtu.be
https://github.com/internetarchive/archive-pdf-tools/issues/52
github.com
https://www.gdpicture.com/
gdpicture.com
https://pdfocr.orpalis.com/
pdfocr.orpalis.com
https://www.gdpicture.com/blog/pdf-optimization-series-part6-mrc-compression/
gdpicture.com
https://avepdf.com/hyper-compress-pdf
avepdf.com
https://passportpdf.com/
passportpdf.com
https://passportpdf.com/developers/api-reference
passportpdf.com
https://support.abbyy.com/hc/en-us/articles/360016544840-Highly-Compressed-MRC-PDF-Export
support.abbyy.com
https://github.com/internetarchive/archive-pdf-tools/issues/61
github.com
https://digital.sciencehistory.org/works/wuaoqyg/viewer/dhc6a4r
digital.sciencehistory.org
https://digital.sciencehistory.org/works/o1cckoa/viewer/wg8ie02
digital.sciencehistory.org
https://digital.sciencehistory.org/works/o0fzyf1
digital.sciencehistory.org
https://github.com/tesseract-ocr/tesseract/issues/660
github.com
https://github.com/agl/jbig2enc
github.com
https://launchpad.net/~alex-p/+archive/ubuntu/jbig2enc
launchpad.net
https://snapcraft.io/install/jbig2enc/ubuntu
snapcraft.io
https://formulae.brew.sh/formula/jbig2enc
formulae.brew.sh
https://github.com/agl/jbig2enc/issues/15
github.com
https://github.com/agl/jbig2enc/pull/78
github.com
https://github.com/agl/jbig2enc/issues/76
github.com
https://github.com/agl/jbig2enc/issues/10
github.com
https://github.com/internetarchive/archive-pdf-tools/blob/a7878d4811224126ee1bf84e084c30bbce04d7bf/internetarchivepdf/pdfrenderer.py
github.com
https://github.com/MerlijnWajer
github.com
https://github.com/ocropus/hocr-tools/blob/master/hocr-pdf
github.com
https://www.npmjs.com/package/@warren-bank/node-hocr-resizer
npmjs.com
https://github.com/NCSU-Libraries/ocracoke/blob/master/app/processing_helpers/hocr_resizer.rb
github.com
https://github.com/eloops/hocr2pdf/pull/6
github.com
https://github.com/eloops/hocr2pdf/pull/5
github.com
https://github.com/d235j/pdfbeads
github.com
https://github.com/ifad/pdfbeads/
github.com
https://my.diffend.io/gems/pdfbeads/1.1.1/1.1.3
my.diffend.io
https://github.com/d235j/pdfbeads/blob/master/lib/pdfbeads/pdfbuilder.rb
github.com
https://github.com/d235j/pdfbeads/blob/master/doc/pdfbeads.en.html
github.com
OCRmyPDF Read at the source ↗
github.com
https://github.com/ocrmypdf/OCRmyPDF/blob/7bd0e43243a05e56a92d6b00fcaa3c826fb3cccd/src/ocrmypdf/hocrtransform.py
github.com
https://ocrmypdf.readthedocs.io/en/latest/advanced.html
ocrmypdf.readthedocs.io
https://github.com/ocrmypdf/OCRmyPDF/issues/541
github.com
https://github.com/jbrinley/HocrConverter/blob/master/HocrConverter.py
github.com
https://xplus3.net/2009/04/02/convert-hocr-to-pdf/
xplus3.net