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Ethiopic Document Image Database for Testing Character Recognition Systems
Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
2006 (English)Report (Other academic)
Abstract [en]

In this paper we describe the acquisition and content of a large database of Ethiopic documents for testing and evaluating character recognition systems. The Ethiopic Document Image Database (EDIDB) contains documents written in Amharic and Geez languages. The database was built from a variety of documents such as printouts, books, newspapers, and magazines. Documents written in various font types, sizes and styles were included in the database. Degraded and poor quality documents were also included in the database to represent the real life situation. A total of 1,204 pages were scanned at a resolution of 300 dpi and saved as grayscale images of JPEG format. We also describe an evaluation protocol for standardizing the comparison of recognition systems and their results. The database is made available to the research community through http://www.hh.se/staff/josef/.

Place, publisher, year, edition, pages
Halmstad: Halmstad University , 2006. , 6 p.
National Category
Computer Systems
Identifiers
URN: urn:nbn:se:hh:diva-14930OAI: oai:DiVA.org:hh-14930DiVA: diva2:408389
Available from: 2011-04-04 Created: 2011-04-04 Last updated: 2013-01-16Bibliographically approved
In thesis
1. Multifont recognition System for Ethiopic Script
Open this publication in new window or tab >>Multifont recognition System for Ethiopic Script
2006 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis, we present a general framework for multi-font, multi-size and multi-style Ethiopic character recognition system. We propose structural and syntactic techniques for recognition of Ethiopic characters where the graphically comnplex characters are represented by less complex primitive structures and their spatial interrelationships. For each Ethiopic character, the primitive structures and their spatial interrelationships form a unique set of patterns.

The interrelationships of primitives are represented by a special tree structure which resembles a binary search tree in the sense that it groups child nodes as left and right, and keeps the spatial position of primitives in orderly manner. For a better computational efficiency, the primitive tree is converted into string pattern using in-order traversal, which generates a base of the alphabet that stores possibly occuring string patterns for each character. The recognition of characters is then achieved by matching the generated patterns with each pattern in a stored knowledge base of characters.

Structural features are extracted using direction field tensor, which is also used for character segmentation. In general, the recognition system does not need size normalization, thinning or other preprocessing procedures. The only parameter that needs to be adjusted during the recognition process is the size of Gaussian window which should be chosen optimally in relation to font sizes. We also constructed an Ethiopic Document Image Database (EDIDB) from real life documents and the recognition system is tested with respect to variations in font type, size, style, document skewness and document type. Experimental results are reported.

Place, publisher, year, edition, pages
Göteborg: Department of Signals and Systems, Chalmers University of Technology, 2006. 46 p.
Series
Technical report, 2006:21
Keyword
Ethiopic character recognition, OCR, Multifont recognition, Amharic, Direction fields, Structural and syntactic pattern recognition
National Category
Computer Vision and Robotics (Autonomous Systems)
Identifiers
urn:nbn:se:hh:diva-1978 (URN)2082/2373 (Local ID)2082/2373 (Archive number)2082/2373 (OAI)
Presentation
(English)
Supervisors
Available from: 2008-09-29 Created: 2008-09-29 Last updated: 2013-01-16Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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  • vancouver
  • Other style
More styles
Language
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More languages
Output format
  • html
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  • asciidoc
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