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Title: An efficient, font independent word and character segmentation algorithm for printed Arabic text
Authors: Qaroush, Aziz 
Jaber, Bassam 
Mohammad, Khader 
Washaha, Mahdi 
Maali, Eman 
Nayef, Nibal 
Keywords: Arabic OCR;Machine learning;Neural networks (Computer science);Optical Character Recognition;Word segmentation;Speech perception - Arabic language;Character segmentation;Natural language processing (Computer science);Image analysis;Image processing - Digital techniques;Segmentation techniques;Baseline;Projection profile
Issue Date: 2022
Publisher: Journal of King Saud University - Computer and Information Sciences
Abstract: Characters segmentation is a necessity and the most critical stage in Arabic OCR system. It has attracted the interest of a wide range of researchers. However, the nature of the Arabic cursive script poses extra challenges that need further investigation. Therefore, having a reliable and efficient Arabic OCR system that is independent of font variations is highly required. In this paper, an indirect, font-in dependent word and character segmentation algorithm for printed Arabic text investigated. The proposed algorithm takes a binary line image as an input and produces a set of binary images consisting of one character or ligature as an output. The segmentation performed at two levels: a word segmentation performed in the first level, by employing a vertical projection at the input line image along with using Interquartile Range (IQR) method to differentiate between word gaps and within word gaps. A projection profile method used as a second level of segmentation along with a set of statistical and topological features, which are font independent, to identify the correct segmentation points from all potential points. The APTI dataset used to test the proposed algorithm with a variety of font type, size, and style. The algorithm experimented on 1800 lines (approximately 24,816 words) with an average accuracy of 97.7% for words segmentation and 97.51% for characters segmentation.
DOI: 10.1016/j.jksuci.2019.08.013
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