تشخيص تغييرات صحنه به روش زمينه گيري هوشمند
الموضوعات :
محمود فتحی
1
(دانشگاه علم و صنعت ایران)
حسن شكوری
2
(جهاد دانشگاهی صنعتی شريف)
الکلمات المفتاحية: بلوك بندي تصاويرتركيبي از گوسين‌هاتفاضل زمينهجداسازي رو زمينه,
ملخص المقالة :
جداسازي روزمينه از زمينه، در بسياري از كاربردهاي نظارت تصويري به عنوان اولين و مهمترين قدم شناخته ميشود و "تفاضل زمينه" روشي است كه معمولاً براي اين منظور استفاده ميشود. اين روش، هر فريم را با مدلي از صحنة خالي مقايسه كرده و ناحيههايي از آنرا كه بطور قابل ملاحظهاي متفاوت به نظر ميرسند به عنوان نواحي روزمينه مشخص ميكند. اين مقاله روش جديدي براي تفاضل زمينه ارائه ميكند كه در آن ابتدا هر تصوير به بلوكهاي يكساني تفكيك شده و سپس ويژگيهاي تعيينكنندهاي از بلوكها محاسبه شده و سابقة مقادير هر يك از اين ويژگيها، به صورت تركيبي از توزيعهاي گوسين مدل ميگردد. با ورود هر فريم جديد، اين توزيعها با روش سريعي بهنگام ميشوند آنگاه توزيعهاي گوسين مدلهاي تركيبي، براي يافتن توزيعهايي كه بيانكنندة زمينه هستند ارزيابي ميشوند و هر بلوك بر اساس اينكه مقادير ويژگيهاي آن جزو كداميك از توزيعها باشد در دو كلاس زمينه و روزمينه دستهبندي ميشود. پيادهسازي نرمافزاري اين روش روي كامپيوتر شخصي، حاكي از عملكرد قابل قبول سيستم در برابر اجسام متجاوز به صحنه (مستقل از سرعت حركت آنها)، اضافه يا كاسته شدن اجسام داخل صحنه، نويز تصويربرداري و تغييرات ناخواستة صحنه است و سرعت بالا و نياز به حافظة كم، آنرا براي درصد بالايي از كاربردهاي بلادرنگ مناسب ميسازد.
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