Raf. J. of Comp. & Math’s. , Vol. 6, No. 1, 2009 169 Arabic Character Recognition Using Fractal Dimension Khalil I. Alsaif Karam Hatim Thanoon khalil_alsaif@uomosul.edu.iq karamhatim@uomosul.edu.iq College of Computer Sciences and Mathematics University of Mosul, Iraq Received on: 13/10/2008 Accepted on: 04/12/2008 ABSTRACT In this work the concepts of the pattern recognition was used to recognize printed Arabic characters, and the Fractal geometric dimension method was used. The input for the system is image, with bitmap format , then the image of character is recognized, and after that it is feeding to the OCR system. A feature space containing the values of the fractal dimension for the letters of Arabic was constructed. These features were used in the recognition phase. In this phase a comparison was made between the values in the feature space and the values of the letter inputs to be recognized, the comparison was done by the minimum Euclidian distance. Results of this work are 75% succeeded. And Matlab 6.5 is used to write the functions and subroutines for this work. Keywords: Fractal Dimension, optical character recognition, feature extraction. تخدام البعد الكسريي بأس تمييز الحرف العرب ابراهيم السيفيل أ.م.د خل م. م حاتم ذنو كرم ن اضياتب والريلحاسو كلية علوم ا/ موصلمعة ال جا ستلم:ريخ ال تا13 / 10 / 2008 قبول:ريخ ال تا04 / 12 / 2008 ملخص ال استخدام طريقةطبوعة. تمز الحروف العربية المنماط لغرض تميي تمييز الفهوم م في هذا البحث استخدام أبعادعمل.ة في هذا الة الكسري الهندس نوع من تكون ئي وسح الضولماستخدام الصورة بال ادخا يتم اbmp ، وبعد ذه اللك تغذى ه ذز الحرف الضوئي تمييلى نظام صورة ا(OCR) . ة الكسرية الهندسبعاد استخدم في البحث ا لخاصة بالحرص الخواص استخل ل ف عملث يتم طور التمييز ، حيستخدم فيي ت الخواص هي التذه العربي، وه لمقارنة باذه امت همييز وت لغرض التمدخلصة وقيم الحرف المستخلن قيم الخواص ال مقارنة بي سلمسافة تخدام ا دية الصغرىقلي ال علىحصول . تم ال75 خدمت لغةئج الصحيحة واستلنتا من ا% Matlab 6.5 ء الد لبنا وال امج الفرعية لهذا البحث والبر. لمفتاحيةت اكلما ال: ص الخواص.حروف، استخل، تمييز ال البعد الكسري 1. Introduction : The word fractal dimension was used at the first time in the geometry area by the scientist Mandelbrote, which is made a big changes in the area of dealing with the natural images that is containing natural parts like trees, mountains, clouds, cost borers, … etc [10]. The calculation of fractal dimension is done by depending on self similarity, which is depending on dividing a shape into many parts, each part is similar to the base shape, and the process of dividing to smaller parts gives the same results. This means that the image is the same if the vision measure is changed [10]. For understanding the fractal dimension in a better way, specially in the area of images, it is important to mention topological dimension [4]. The topological dimension for a strait line or curve is one, for two dimensional shapes or surfaces is two, like square and rectangle, and for three dimensional shapes like cylinder or cube is three.