NDLI: On lexical resources for digitization of historical documents

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On lexical resources for digitization of historical documents

Content Provider	ACM Digital Library
Author	Ringlstetter, Christoph Reffle, Ulrich Schulz, Klaus U. Gotscharek, Annette
Abstract	Many European libraries are currently engaged in mass digitization projects that aim to make historical documents and corpora online available in the Internet. In this context, appropriate lexical resources play a double role. They are needed to improve OCR recognition of historical documents, which currently does not lead to satisfactory results. Second, even assuming a perfect OCR recognition, since historical language differs considerably from modern language, the matching process between queries submitted to search engines and variants of the search terms found in historical documents needs special support. While the usefulness of special dictionaries for both problems seems undisputed, concrete knowledge and experience are still missing. There are no hints about what optimal lexical resources for historical documents should look like. The real benefit reached by optimized lexical resources is unclear. Both questions are rather complex since answers depend on the point in history when documents were born. We present a series of experiments which illuminate these points. For our evaluations we collected a large corpus covering German historical documents from before 1500 to 1950 and constructed various types of dictionaries. We present the coverage reached with each dictionary for ten subperiods of time. Additional experiments illuminate the improvements for OCR accuracy and Information Retrieval that can be reached, again looking at distinct dictionaries and periods of time. For both OCR and IR, our lexical resources lead to substantial improvements.
Starting Page	193
Ending Page	200
Page Count	8
File Format	PDF
ISBN	9781605585758
DOI	10.1145/1600193.1600236
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2009-09-16
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Historical spelling variants Electronic lexica Information retrieval
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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