Mr. Saroj Kumar Profile

Saroj Kumar

at Indian Institute of Technology Roorkee

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Proceedings Article | 2 February 2011 Paper

Human action recognition in a wide and complex environment

Sanoj Kumar, Sanjeev Kumar, Balasubramanian Raman, Nagarajan Sukavanam

Proceedings Volume 7871, 78710I (2011) https://doi.org/10.1117/12.872316

KEYWORDS: Cameras, Video, Databases, Feature extraction, Image classification, Video surveillance, Machine learning, Neural networks, Environmental monitoring, Surveillance systems

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In this paper, a linear discriminant analysis (LDA) based classifier employed in a tree structure is presented to recognize the human actions in a wide and complex environment. In particular, the proposed classifier is based on a supervised learning process and achieves the required classification in a multi-step process. This multi-step process is performed simply by adopting a tree structured which is built during the training phase. Hence, there is no need of any priori information like in other classifiers such as the number of hidden neurons or hidden layers in a multilayer neural network based classifier or an exhaustive search as used in training algorithms for decision trees. A skeleton based strategy is adopted to extract the features from a given video sequence representing any human action. A Pan-Tilt-Zoom (PTZ) camera is used to monitor the wide and complex test environment. A background mosaic image is built offline and used to compute the background images in real time. A background subtraction strategy has been adopted for detecting the object in various frames and to extract their corresponding silhouette. A skeleton based process is used to extract attributes of a feature vector corresponding to a human action. Finally, the proposed framework is tested on various indoor and outdoor scenarios and encouraging results are achieved in terms of classification accuracy.

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