Natural Language Processing for Historical Texts

Natural Language Processing for Historical Texts

Michael Piotrowski
ISBN: 9781608459469 | PDF ISBN: 9781608459476
Copyright © 2012 | 157 Pages | Publication Date: 01/01/2012

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More and more historical texts are becoming available in digital form. Digitization of paper documents is motivated by the aim of preserving cultural heritage and making it more accessible, both to laypeople and scholars. As digital images cannot be searched for text, digitization projects increasingly strive to create digital text, which can be searched and otherwise automatically processed, in addition to facsimiles. Indeed, the emerging field of digital humanities heavily relies on the availability of digital text for its studies.

Together with the increasing availability of historical texts in digital form, there is a growing interest in applying natural language processing (NLP) methods and tools to historical texts. However, the specific linguistic properties of historical texts -- the lack of standardized orthography, in particular -- pose special challenges for NLP.

This book aims to give an introduction to NLP for historical texts and an overview of the state of the art in this field. The book starts with an overview of methods for the acquisition of historical texts (scanning and OCR), discusses text encoding and annotation schemes, and presents examples of corpora of historical texts in a variety of languages. The book then discusses specific methods, such as creating part-of-speech taggers for historical languages or handling spelling variation. A final chapter analyzes the relationship between NLP and the digital humanities.

Certain recently emerging textual genres, such as SMS, social media, and chat messages, or newsgroup and forum postings share a number of properties with historical texts, for example, nonstandard orthography and grammar, and profuse use of abbreviations. The methods and techniques required for the effective processing of historical texts are thus also of interest for research in other domains.

Table of Contents

NLP and Digital Humanities
Spelling in Historical Texts
Acquiring Historical Texts
Text Encoding and Annotation Schemes
Handling Spelling Variation
NLP Tools for Historical Languages
Historical Corpora

About the Author(s)

Michael Piotrowski, Leibniz Institute of European History, Germany
Michael Piotrowski is head of the Digital Humanities research group at the Leibniz Institute of European History in Mainz, Germany. Before this, he worked as a postdoc researcher with the Law Sources Foundation of the Swiss Lawyers Society and was an adjunct lecturer at the Institute of Computational Linguistics of the University of Zurich, Switzerland. He received his doctoral degree in Computer Science in 2009 from Otto von Guericke University Magdeburg, Germany. He also holds an M.A. in Computational Linguistics, English Philology, and Applied Linguistics from Friedrich-Alexander University Erlangen-Nuremberg, Germany. His main research interests are language technology for historical texts, document engineering, interactive editing and authoring aids, and e-learning technology.

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