شناسایی افراد از طریق رگ‌های خونی انگشت دست در فضای رادون با به کارگیری الگوهای فضایی مشترک
الموضوعات :
1 - دانشگاه صنعتی شاهرود
2 - دانشگاه صنعتی شاهرود
الکلمات المفتاحية: شناسایی رگ انگشت آستانه‌گذاری آنتروپی محلی تبدیل رادون الگوهای فضایی مشترک (CSP),
ملخص المقالة :
یکی از مناسب‌ترین بیومتریک‌ها برای شناسایی افراد، رگ‌های انگشت دست می‌باشد. در این مقاله روش جدیدی ارائه شده است که به شناسایی افراد از طریق رگ‌های خونی انگشت دست با دقت بالا می‌پردازد. این مقاله ابتدا از آستانه‌گذاری آنتروپی محلی برای قطعه‌بندی و استخراج رگ‌ها از تصاویر انگشت استفاده می‌نماید. آستانه‌گذاری آنتروپی محلی رگ‌ها را به خوبی استخراج می‌کند اما تصاویر حاصل از آن نویزی هستند به این مفهوم که رگ‌های استخراج‌شده ممکن است به صورت خطوط متقاطع ظاهر شوند. برای کم‌کردن حساسیت مرحله شناسایی نسبت به نویزهای موجود در تصاویر قطعه‌بندی شده، از تبدیل رادون استفاده می‌کنیم. تبديل رادون به علت داشتن ماهيت انتگرالي، نسبت به نويزهاي موجود در تصوير حساس نيست و بنابراین در مقایسه با سایر روش‌ها نسبت به نویز از مقاومت بیشتری برخوردار است. همچنین با استفاده از این تبدیل علاوه بر این که به استخراج خطوط رگ به طور دقیق نیاز نیست، دقت و سرعت شناسایی نیز افزایش می‌یابد. برای استخراج ویژگی از تصاویر رگ انگشت، الگوهای فضایی مشترک به بلوک‌های تبدیل رادون اعمال می‌شوند. در مرحله شناسایی نیز از دو روش نزدیک‌ترین همسایهNN) -1) و شبکه عصبی پرسپترون چندلایه (MLP) استفاده می‌شود. آزمایش‌های انجام‌شده روی مجموعه تصاویر رگ انگشت پایگاه داده دانشگاه پکینگ نرخ موفقیت 6753/99 درصد در شناسایی افراد را نشان می‌دهد.
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