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    Recognition of off-line printed Arabic text using Hidden Markov Models.

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    Publication date
    27/06/2008
    End of Embargo
    2008
    Author
    Al-Muhtaseb, Husni A.
    Mahmoud, Sabri A.
    Qahwaji, Rami S.R.
    Keyword
    Signal Processing
    OCR
    Feature extraction
    Arabic text recognition
    Hidden Markov Models (HMM)
    Omni font recognition
    Rights
    © 2008 Elsevier. Reproduced in accordance with the publisher's self-archiving policy.
    Peer-Reviewed
    yes
    
    Metadata
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    Abstract
    This paper describes a technique for automatic recognition of off-line printed Arabic text using Hidden Markov Models. In this work different sizes of overlapping and non-overlapping hierarchical windows are used to generate 16 features from each vertical sliding strip. Eight different Arabic fonts were used for testing (viz. Arial, Tahoma, Akhbar, Thuluth, Naskh, Simplified Arabic, Andalus, and Traditional Arabic). It was experimentally proven that different fonts have their highest recognition rates at different numbers of states (5 or 7) and codebook sizes (128 or 256). Arabic text is cursive, and each character may have up to four different shapes based on its location in a word. This research work considered each shape as a different class, resulting in a total of 126 classes (compared to 28 Arabic letters). The achieved average recognition rates were between 98.08% and 99.89% for the eight experimental fonts. The main contributions of this work are the novel hierarchical sliding window technique using only 16 features for each sliding window, considering each shape of Arabic characters as a separate class, bypassing the need for segmenting Arabic text, and its applicability to other languages.
    URI
    http://hdl.handle.net/10454/4105
    Version
    Accepted Manuscript
    Citation
    Al-Muhtaseb, H. A., Mahmoud, S. A. and Qahwaji, R. S. R. (2008). Recognition of off-line printed Arabic text using Hidden Markov Models. Signal Processing, Vol. 88, No. 12, pp. 2902-2912.
    Link to publisher’s version
    http://dx.doi.org/doi:10.1016/j.sigpro.2008.06.013
    Type
    Article
    Collections
    Engineering and Informatics Publications

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