Video surveillance has significant application prospects such as security, law enforcement, and traffic monitoring.\nVisual traffic surveillance using computer vision techniques can be non-invasive, cost effective, and automated.\nDetecting and recognizing the objects in a video is an important part of many video surveillance systems which\ncan help in tracking of the detected objects and gathering important information. In case of traffic video surveillance,\nvehicle detection and classification is important as it can help in traffic control and gathering of traffic statistics that\ncan be used in intelligent transportation systems. Vehicle classification poses a difficult problem as vehicles have\nhigh intra-class variation and relatively low inter-class variation. In this work, we investigate five different object\nrecognition techniques: PCA + DFVS, PCA + DIVS, PCA + SVM, LDA, and constellation-based modeling applied to the\nproblem of vehicle classification. We also compare them with the state-of-the-art techniques in vehicle classification. In\ncase of the PCA-based approaches, we extend face detection using a PCA approach for the problem of vehicle\nclassification to carry out multi-class classification. We also implement constellation model-based approach that\nuses the dense representation of scale-invariant feature transform (SIFT) features as presented in the work of Ma\nand Grimson (Edge-based rich representation for vehicle classification. Paper presented at the international conference\non computer vision, 2006, pp. 1185ââ?¬â??1192) with slight modification. We consider three classes: sedans, vans, and taxis,\nand record classification accuracy as high as 99.25% in case of cars vs vans and 97.57% in case of sedans vs taxis. We\nalso present a fusion approach that uses both PCA + DFVS and PCA + DIVS and achieves a classification accuracy of\n96.42% in case of sedans vs vans vs taxis.
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