ارائه یک الگوریتم آبشاری برای بهبود سرعت و دقت یک سیستم شناسایی نوع و مدل خودرو
محورهای موضوعی : مهندسی برق و کامپیوترمحسن بيگلري 1 , سیدعلی سلیمانی 2 , حمید حسن‌پور 3
1 - دانشگاه صنعتی شاهرود
2 - دانشگاه صنعتی شاهرود
3 - دانشگاه صنعتی شاهرود
کلید واژه: شناسایی دانه‌ریز اشیا شناسایی نوع و مدل وسیله نقلیه VMMR پردازش آبشاری الگوریتم آبشاری,
چکیده مقاله :
در دهه اخیر، مطالعات بسیاری بر روی طبقه‌بندی دانه‌ریز اشیا صورت گرفته است. در این نوع طبقه‌بندی گروه کلی شیء مشخص بوده و هدف تعیین زیرگروه دقیق آن است و شناسایی نوع و مدل وسیله نقلیه (VMMR) نیز در این حوزه قرار می‌گیرد. این مسئله به دلیل وجود تعداد کلاس‌های زیاد، تفاوت درون کلاسی بسیار و تفاوت بین کلاسی کم از مسایل طبقه‌بندی دشوار به شمار می‌رود. علاوه بر این معمولاً سرعت سیستم‌های شناسایی اشیا با افزایش دقت، کاهش می‌یابد و چنان که می‌بینیم یکی از چالش‌های مهم در شبکه‌های عصبی عمیق به عنوان یک ابزار قدرتمند بینایی ماشین، سرعت پردازش است. در این مقاله ابتدا روشی مبتنی بر بخش برای شناسایی نوع و مدل خودرو مختصراً معرفی می‌گردد و سپس یک الگوریتم آبشاری برای بهبود توأمان سرعت و دقت این سیستم ارائه می‌شود. الگوریتم آبشاری پیشنهادی، طبقه‌بندهای موجود در سیستم را به صورت ترتیبی به تصویر ورودی اعمال کرده تا از حجم پردازش بکاهد. چند معیار مناسب برای رسیدن به یک ترتیب کارا از طبقه‌بندها معرفی شده و در نهایت ترکیبی از آنها در الگوریتم پیشنهادی به کار گرفته شده است. نتیجه آزمایشات انجام‌شده بر روی مجموعه داده کاملاً متفاوت BVMMR و CompCars، نشان از دقت بالای سیستم شناسایی نوع و مدل خودرو دارد. پس از اعمال الگوریتم آبشاری به سیستم مورد بحث، سرعت پردازش تا 80% افزایش یافته است در حالی که دقت سیستم تنها کاهش جزئی داشته است.
In the last decade, many researches have been done on fine-grained recognition. The main category of the object is known in this problem and the goal is to determine the subcategory or fine-grained category. Vehicle Make and Model Recognition (VMMR) is a hard fine-grained classification problem, due to the large number of classes, substantial inner-class and small inter-class distance. Furthermore, improving system accuracy leads to increasing in processing time. As we can see the state-of-the-art machine vision tool like convolutional neural networks lacks in real-time processing time. In this paper, a method has been presented briefly for VMMR firstly. Secondly, a cascading scheme for improving both speed and accuracy of this VMMR system has been proposed. In order to eliminate extra processing cost, the proposed cascading scheme applies classifiers to the input image in a sequential manner. Some effective criterions for an efficient ordering of classifiers are proposed and finally a fusion of them is used in the cascade algorithm. For evaluation purposes, a new dataset with more than 5000 vehicles of 28 different makes and models has been collected. The experimental results on this dataset and comprehensive CompCars dataset show outstanding performance of our approach. Our cascading scheme results up to 80% increase in the system processing speed.
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