بخش‌بندي تصاوير رنگي بيروني به هدف تشخيص اشياء به كمك هيستوگرام با دقت دوگانه
الموضوعات :جواد راستي 1 , سید امیرحسن منجمی 2 , عباس وفایی 3
1 - مهندسی پزشکی
2 -
3 - دانشگاه اصفهان
الکلمات المفتاحية: تصاوير بيروني, خوشه‌بندي, بخش‌بندي رنگي, دقت تصوير,
ملخص المقالة :
يكي از مسايل مهم در پردازش خودكار تصاوير بيروني، نحوه بخش‌بندي اين تصاوير به هدف تشخيص شيء در آنها مي‌باشد. مشخصات خاص اين تصاوير از جمله تنوع رنگ، اثرات نوري متفاوت، وجود سايه‌هاي رنگي، جزييات بافتي زياد و وجود اشياء كوچك و ناهمگن باعث مي‌شود مسأله بخش‌بندي تصاوير بيروني به ويژه بخش‌بندي رنگي با چالش‌هاي جدي مواجه شود. در تحقيقات قبليبراي خوشه‌بندي رنگي تصاوير بيروني به هدف بخش‌بندي ابتدايي، روشي مبتني بر الگوريتم خوشه‌بندي k-means در بستري با دقت چندگانه پيشنهاد شده بود.اين روش با استفاده از محو عمدي جزييات بافتي تصوير و حذف كلاسهاي محرز در تصاوير محو شده و سپس اضافه كردن كلاسها در تصاوير با دقت بالاتر، كارايي مناسبي براي بخش‌بندي ابتدايي اين تصاوير در مقايسه با روش k-means عادي نشان مي‌داد.در اين مقاله، يك روش تطبيق‌پذير با تصوير با استفاده از هيستوگرام حلقوي ته‌رنگ براي تشخيص كلاسهاي محرز در تصاوير محوشده در بستري با دقت دوگانه پيشنهاد گرديده است.كارايي اين الگوريتم به كمك يك روش ارزيابينظارت‌شده روي دو پايگاه داده از تصاوير بيروني بررسي شده كه حدود 20% كاهش خطاي پيكسلي در بخش‌بندي و نيز دقت و حدود 30% سرعت بيشتر در همگرايي الگوريتم خوشه‌بندي، نشانگر كيفيت بالاتر روش پيشنهادي نسبت به روش عادي است.
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