{"id":41,"date":"2011-12-02T22:20:03","date_gmt":"2011-12-02T21:20:03","guid":{"rendered":"http:\/\/localhost\/~johan\/wordpress\/?p=41"},"modified":"2014-07-20T20:48:25","modified_gmt":"2014-07-20T18:48:25","slug":"a-textscanning-workflow","status":"publish","type":"post","link":"https:\/\/www.chaosgeordend.nl\/wordpress\/2011\/12\/02\/a-textscanning-workflow\/","title":{"rendered":"A textscanning workflow"},"content":{"rendered":"

For a project that involved dozens of print pages to be saved as textdocuments, I used the Tesseract OCR<\/a> program together with the Netpbm<\/a> library. Here’s what the three step workflow looks like.<\/p>\n

<\/p>\n

From print to an OpenOffice textdocument in three steps:
\nNote that a little command-line proficiency is required here.<\/p>\n

    \n
  1. \n

    scan all documents
    \nThe printed text consisted of A4 pages as well as small (A5) booklets.
    \nThe A4 pages were scanned in full, booklets two pages at a time. Scanner settings: 300 dpi, B\/W (1 bit), saved as .tif files with a     sequencenumber suffixed filename<\/a><\/p>\n

  2. \n

    process the .tif files in batch with this shell script<\/a>. Adjust it to your specific needs, e.g. the pixelsize of the scan images.<\/p>\n

  3. \n

    heavily relying on the spellchecker, use OpenOffice to cleanup the raw .txt and save the final text as .odt<\/p>\n<\/ol>\n

    Et voila!<\/p>\n

    Software used<\/strong>
    \nTesseract 3.00,     Macports<\/a> package
    \nXDialog 2.3.1, idem<\/p>\n

    Tesseract trained data<\/strong>
    \nCopied to \/opt\/local\/share\/tessdata
    \n    Dutch<\/a>
    \n    English<\/a>
    \n    Hindi<\/a><\/p>\n

    Sample text<\/strong> (dutch)
    \nThe scanned original: (textsnippet taken from this     lecture<\/a>)<\/p>\n

    \"Scanned<\/div>\n

    Tesseract OCR result:<\/p>\n

    \"Raw<\/div>\n

    The final text after editing:<\/p>\n

    \"Final<\/div>\n","protected":false},"excerpt":{"rendered":"

    For a project that involved dozens of print pages to be saved as textdocuments, I used the Tesseract OCR program together with the Netpbm library. Here’s what the three step workflow looks like.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,5,6,13],"tags":[],"class_list":["post-41","post","type-post","status-publish","format-standard","hentry","category-devanagari","category-dtp","category-oss","category-taallanguage"],"_links":{"self":[{"href":"https:\/\/www.chaosgeordend.nl\/wordpress\/wp-json\/wp\/v2\/posts\/41","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.chaosgeordend.nl\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.chaosgeordend.nl\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.chaosgeordend.nl\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.chaosgeordend.nl\/wordpress\/wp-json\/wp\/v2\/comments?post=41"}],"version-history":[{"count":11,"href":"https:\/\/www.chaosgeordend.nl\/wordpress\/wp-json\/wp\/v2\/posts\/41\/revisions"}],"predecessor-version":[{"id":118,"href":"https:\/\/www.chaosgeordend.nl\/wordpress\/wp-json\/wp\/v2\/posts\/41\/revisions\/118"}],"wp:attachment":[{"href":"https:\/\/www.chaosgeordend.nl\/wordpress\/wp-json\/wp\/v2\/media?parent=41"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.chaosgeordend.nl\/wordpress\/wp-json\/wp\/v2\/categories?post=41"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.chaosgeordend.nl\/wordpress\/wp-json\/wp\/v2\/tags?post=41"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}