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LINGUISTIC CRITERIA FOR ARABIC TEXT OPTICAL RECOGNITION
Abstract
Each written text could be considered as a sequence of symbols put up in groups organized in a certain order and assembled in a linear sequence, which is may be arranged horizontally or vertically. The existing methods of optical character recognition (OCR) aim at linear and vertical segmentation of written texts basing on interword spaces and intervals between letters as the demarcation markers of lexical units and characters respectively. This strategy is effective for many languages meanwhile building robust OCR techniques for Arabic still remains extremely challenging task. The problem lies primarily in the very character of the Arabic script in which letters may vary depending on their position in words and have different lengths and heights not talking about its cursiveness. In this case, pure mathematical methods of OCR have limited efficiency. We suggest methodology which along with 'traditional' attitudes takes into consideration such linguistic data as character entries frequency index, compatibility of characters within words, word frequency index for Arabic. This data are among the indicators that facilitate interpretation and identification of written text and should be used as the components to build a robust method of OCR for Arabic based scripts.
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References13
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Alginahi Y.M., Kabir M.N., Tayan O., An Enhanced Kashida-Based Watermarking Approach for Increased Protection in Arabic Text-Documents Based on Frequency Recurrence of Characters, International Journal of Computer and Electrical Engineering, vol. 6, No 5, pp. 381- 392, October 2014, p. 384.
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