Activity recognition using binary tree SVM

Umakanthan, Sabanadesan, Denman, Simon, Fookes, Clinton, & Sridharan, Sridha (2014) Activity recognition using binary tree SVM. In IEEE Workshop on Statistical Signal Processing (SSP 2014), IEEE, Gold Coast, Qld, pp. 248-251.

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This paper presents an effective classification method based on Support Vector Machines (SVM) in the context of activity recognition. Local features that capture both spatial and temporal information in activity videos have made significant progress recently. Efficient and effective features, feature representation and classification plays a crucial role in activity recognition. For classification, SVMs are popularly used because of their simplicity and efficiency; however the common multi-class SVM approaches applied suffer from limitations including having easily confused classes and been computationally inefficient. We propose using a binary tree SVM to address the shortcomings of multi-class SVMs in activity recognition. We proposed constructing a binary tree using Gaussian Mixture Models (GMM), where activities are repeatedly allocated to subnodes until every new created node contains only one activity. Then, for each internal node a separate SVM is learned to classify activities, which significantly reduces the training time and increases the speed of testing compared to popular the `one-against-the-rest' multi-class SVM classifier. Experiments carried out on the challenging and complex Hollywood dataset demonstrates comparable performance over the baseline bag-of-features method.

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ID Code: 92900
Item Type: Conference Paper
Refereed: Yes
Keywords: Gaussian processes, Image classification, Image representation, Support vector machines, Video signal processing
DOI: 10.1109/SSP.2014.6884622
ISBN: 9781479949755
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Facilities: Science and Engineering Centre
Copyright Owner: Copyright 2014 IEEE
Deposited On: 17 Feb 2016 00:45
Last Modified: 22 Feb 2016 14:57

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