主講人：謝君偉 教授(國立海洋大學資訊工程系主任)
時間：102年5月29日(星期三13:30-15:30)
地點：三峽校區人文大樓文1F11教室
題目：Vehicle Color and Model Type Classification from Roads
大綱：
SURF (Speeded Up Robust Features) is a robust and useful feature detector for various vision-based applications but lacks the ability to detect symmetrical objects. This paper proposes a new symmetrical SURF descriptor to enrich the power of SURF to detect all possible symmetrical matching pairs through a mirroring transformation. A vehicle classification application is then adopted to prove the practicability and feasibility of the method. To detect vehicles from the road, the proposed symmetrical descriptor is first applied to determine the ROI of each vehicle from the road without using any motion features. This scheme provides two advantages; there is no need of background subtraction and it is extremely efficient for real-time applications. Two MMR challenges, i.e., multiplicity and ambiguity problems, are then addressed. The multiplicity problem stems from one vehicle model often having different model shapes on
the road. The ambiguity problem results from vehicles from different companies often sharing similar shapes. To address these two problems, a grid division scheme is proposed to separate a vehicle into several grids; different weak classifiers that are trained on these grids are then integrated to build a strong ensemble classifier. The color, HOG, and SURF descriptors are adopted to train the weak classifiers through an SVM learning algorithm. Because of the rich representation power of the grid-based method and the high accuracy of
vehicle detection, the ensemble classifier can accurately recognize the color and model type of each vehicle.
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