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Stefan Pletschacher

Stefan Pletschacher

Room 248, Newton Building

E-mail: S.Pletschacher (append "@primaresearch.org")

University of Salford
School of Computing, Science & Engineering
Salford
Greater Manchester, M5 4WT
United Kingdom

Tel: Tel: +44-(0)161-295 5654


Stefan Pletschacher is a Lecturer in Computer Science at the University of Salford and a member of the Pattern Recognition and Image Analysis (PRImA) Research Lab. In the past he has held positions as Research Fellow at the University of Salford and Research Assistant at the Institute for Print and Media Technology at Chemnitz University of Technology. Besides his academic career he has worked as freelance software developer as well as consultant for digitisation projects. Stefan has been developer, technical advisor, and work package leader in large-scale international projects related to media production, digitisation, and Optical Character Recognition (OCR) such as SELEAC, IMPACT, SUCCEED, Europeana Newspapers, and eMOP. As technical lead he has overseen the development of numerous open source and commercial software projects implemented by the PRImA Research Lab.


Research Interests

My research activities are related to the automation of digitisation processes, including document recognition and encoding as well as methods for supporting new and emerging output devices. A main goal is the effective treatment of documents which are not suitable for traditional OCR methods.
  • Document Image Analysis
  • Image Segmentation
  • Feature Extraction
  • Block Classification
  • Vectorization Methods (raster to vector conversion)
  • Pattern Recognition especially OCR, ICR, OMR
  • Machine Learning (decision trees, neural networks, fuzzy classifiers, support vector machines, ...)
  • Clustering Methods
  • Document Encoding
  • XML/XSL Technologies
  • Automatic Layout Generation
  • Single Source Publishing
  • New and Emerging Output Devices
  • Formats for Mobile Devices
  • Automated Digitization Processes
  • Digital Preservation of Cultural Heritage


Publications for Stefan Pletschacher

Refereed Papers

2017

Effective Geometric Restoration of Distorted Historical Document for Large-Scale Digitization

P. Yang, A. Antonacopoulos, C. Clausner, S. Pletschacher, J. Qi

IET Image Processing


Unearthing the Recent Past: Digitising and Understanding Statistical Information from Census Tables

C. Clausner, J. Hayes, A. Antonacopoulos, S. Pletschacher

Proceedings of Second International Conference on Digital Access to Textual Cultural Heritage (DATeCH 2017), Goettingen, Germany, 01 - 02 June 2017

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2016

Quality Prediction System for Large-Scale Digitisation Workflows

C. Clausner, S. Pletschacher, A. Antonacopoulos

Proceedings of the 12th IAPR International Workshop on Document Analysis Systems (DAS2016), Santorini, Greece, April 11-14, 2016

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2015

The ENP Image and Ground Truth Dataset of Historical Newspapers

C. Clausner, C. Papadopoulos, S. Pletschacher, A. Antonacopoulos

Proceedings of the 13th International Conference on Document Analysis and Recognition (ICDAR2015), Nancy, France, August 2015, pp. 931-935

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ICDAR2015 Competition on Recognition of Documents with Complex Layouts – RDCL2015

A. Antonacopoulos, C. Clausner, C. Papadopoulos, S. Pletschacher

Proceedings of the 13th International Conference on Document Analysis and Recognition (ICDAR2015), Nancy, France, August 2015, pp. 1151-1155

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Europeana Newspapers OCR Workflow Evaluation

S. Pletschacher, C. Clausner, A. Antonacopoulos

Proceedings of the 2015 Workshop on Historical Document Imaging and Processing (HIP2015), Nancy, France, August 2015, pp. 39-46

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2014

Document Representation Refinement for Precise Region Description

C. Clausner, S. Pletschacher, A. Antonacopoulos

Proceedings of the First International Conference on Digital Access to Textual Cultural Heritage (DATeCH2014), Madrid, Spain, May 2014, pp. 9-13

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Efficient OCR Training Data Generation with Aletheia

C. Clausner, S. Pletschacher, A. Antonacopoulos

Short Paper Booklet of the 11th International Association for Pattern Recognition (IAPR) Workshop on Document Analysis Systems (DAS2014), Tours, France, April 2014, pp. 19-20

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2013

The Significance of Reading Order in Document Recognition and its Evaluation

C. Clausner, S. Pletschacher, A. Antonacopoulos

Proceedings of the 12th International Conference on Document Analysis and Recognition (ICDAR2013), Washington DC, USA, August 2013, pp. 688-692

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ICDAR2013 Competition on Historical Newspaper Layout Analysis – HNLA2013

A. Antonacopoulos, C. Clausner, C. Papadopoulos, S. Pletschacher

Proceedings of the 12th International Conference on Document Analysis and Recognition (ICDAR2013), Washington DC, USA, August 2013, pp. 1486-1490

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ICDAR2013 Competition on Historical Book Recognition – HBR2013

A. Antonacopoulos, C. Clausner, C. Papadopoulos, S. Pletschacher

Proceedings of the 12th International Conference on Document Analysis and Recognition (ICDAR2013), Washington DC, USA, August 2013, pp. 1491-1495

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The IMPACT Dataset of Historical Document Images

C. Papadopoulos, S. Pletschacher, C. Clausner, A. Antonacopoulos

Proceedings of the 2013 Workshop on Historical Document Imaging and Processing (HIP2013), Washington DC, USA, August 2013, pp. 123-130

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2012

A robust hybrid approach for text line segmentation in historical documents

C. Clausner, A. Antonacopoulos, S. Pletschacher

Proceedings of the 21st International Conference on Pattern Recognition (ICPR2012), Tsukuba, Japan, November 11-15, 2012, IEEE-CS Press, pp. 335-338

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2011

Scenario Driven In-Depth Performance Evaluation of Document Layout Analysis Methods

C. Clausner, S. Pletschacher, A. Antonacopoulos

Proceedings of the 11th International Conference on Document Analysis and Recognition (ICDAR2011), Beijing, China, September 2011, pp. 1404-1408

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Aletheia - An Advanced Document Layout and Text Ground-Truthing System for Production Environments

C. Clausner, S. Pletschacher, A. Antonacopoulos

Proceedings of the 11th International Conference on Document Analysis and Recognition (ICDAR2011), Beijing, China, September 2011, pp. 48-52

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Historical Document Layout Analysis Competition

A. Antonacopoulos, C. Clausner, C. Papadopoulos, S. Pletschacher

Proceedings of the 11th International Conference on Document Analysis and Recognition (ICDAR2011), Beijing, China, September 2011, pp. 1516-1520

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Grid-Based Modelling and Correction of Arbitrarily Warped Historical Document Images for Large-Scale Digitisation

P. Yang, A. Antonacopoulos, C. Clausner, S. Pletschacher

Proceedings of the 2011 Workshop on Historical Document Imaging and Processing (HIP2011), Beijing, China, September 2011, pp. 106-111

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2010

The PAGE (Page Analysis and Ground-Truth Elements) Format Framework

S. Pletschacher, A. Antonacopoulos

Proceedings of the 20th International Conference on Pattern Recognition (ICPR2010), Istanbul, Turkey, August 23-26, 2010, IEEE-CS Press, pp. 257-260

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2009

A New Framework for Recognition of Heavily Degraded Characters in Historical Typewritten Documents Based on Semi-Supervised Clustering

S. Pletschacher, J. Hu, A. Antonacopoulos

Proceedings of the 10th International Conference on Document Analysis and Recognition (ICDAR2009), Barcelona, Spain, July 2009, pp. 506-510

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A Self-Adaptive Method for Extraction of Document-Specific Alphabets

S. Pletschacher

Proceedings of the 10th International Conference on Document Analysis and Recognition (ICDAR2009), Barcelona, Spain, July 2009, pp. 656-660

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A Realistic Dataset for Performance Evaluation of Document Layout Analysis

A. Antonacopoulos, D. Bridson, C. Papadopoulos, S. Pletschacher

Proceedings of the 10th International Conference on Document Analysis and Recognition (ICDAR2009), Barcelona, Spain, July 2009, pp. 296-300

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ICDAR2009 Page Segmentation Competition

A. Antonacopoulos, S. Pletschacher, D. Bridson, C. Papadopoulos

Proceedings of the 10th International Conference on Document Analysis and Recognition (ICDAR2009), Barcelona, Spain, July 2009, pp. 1370-1374

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2008

Representation of Digitized Documents Using Document Specific Alphabets and Fonts

S. Pletschacher

Proceedings of the 5th IS&T Archiving Conference, Bern, Switzerland, June 2008, pp. 198-202

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2006

Vectorization of Glyphs and Their Representation in SVG for XML-Based Processing

S. Pletschacher, M. Eckert, A.C. Huebler

Digital Spectrum: Integrating Technology and Culture, Proceedings of the 10th International Conference on Electronic Publishing, Bansko, Bulgaria, June 2006, pp. 299-308

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2005

OCR Alternatives for Electronic Publishing of Digitised Documents

S. Pletschacher

From Author to Reader: Challenges for the Digital Content Chain, Proceedings of the 9th ICCC International Conference on Electronic Publishing, Leuven-Heverlee, Belgium, June 2005, pp. 35-41

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