التعرف على الأشخاص عن طريق راحة اليد باستخدام تقنية التقاطعات الصفرية
Abstract
التعرف على الأشخاص باستخدام بصمة اليد يلقى الكثير من الاهتمام بالتزامن مع الحاجة إلى تقنيات جديدة ترفع من مستوى الأمان. في هذه الدراسة تم اقتراح تقنية جديدة للتعرف على الأشخاص عن طريق بصمة اليد وذلك من خلال استخلاص السمات من معاملات التحويل المويجي لصور راحة اليد بالاعتماد على فكرة التقاطعات الصفرية (عدد مرات التقاطع مع القيمة صفر). حيث تم إيجاد التحويل المويجي عند المستوى الرابع لكامل صورة اليد والذي نتج عنه أربع مصفوفات، ثلاث مصفوفات تفاصيل (أفقية – شاقولية- قطرية) ومصفوفة تقريبات وتم الاعتماد على مصفوفات التفاصيل دون التقريبات لأن المعلومات التي نحتاجها (خطوط ومنحنيات اليد) محتواة في مصفوفات التفاصيل. بعد ذلك تم استخلاص ستة عشر معامل (سمة ) من كل مصفوفة تفاصيل وترتيب هذه السمات ضمن شعاع واحد ليتشكل شعاع السمات المستخلص من كل عينة من عينات اليد والمكون من ثمان وأربعين (48) سمة والذي تم استخدامه كدخل للشبكة العصبونية المستخدمة. تم خلال هذه الدراسة بناء قاعدة بيانات مكونة من 400 صورة لراحة اليد عائدة لأربعين شخص بمعدل 10 صور لكل شخص. حيث أظهرت الاختبارات العملية أن النظام المصمم نجح في التعرف بمعدل 91.36%. Personal identification based on handprint has been gaining more attention with the increasing needs of high level of security. In this study a novel approach for human recognition based on handprint is proposed. Wavelet transform was used to extract features presented in the palm image based on wavelet zero-crossing method. Firstly the wavelet transform of the whole palm image at the fourth level was worked out, which results in four matrices; three of them are detail matrices (i.e., horizontal, vertical and diagonal) as well as one approximation matrix. Throughout this study, only the detail matrices were used because the required information (i.e., hand lines and curves) is included in those matrices. Sixteen features were extracted from each detail matrix, and then arranged in one vector. Consequently, for each palm sample a feature vector consisting of 48 input features of the used neural network was obtained. For this purpose, a database consisting of 400 palm images belonging to 40 people at the rate of 10 images per person was built. Practical tests outcome showed that the designed system successfully indentified 91.36% of the tested images.Downloads
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