Human Activity Recognition Using Spatiotemporal 3-D Body Joint Features with Hidden Markov Models

• Md. Zia Uddin,
• Jaehyoun Kim,

Vol. 10, No. 6, June 29, 2016
10.3837/tiis.2016.06.017, Download Paper (Free):

• Human-activity Recognition
• Body Joints
• Generalized Discriminant Aanalysis
• Hidden Markov Models

Abstract

Video-based human-activity recognition has become increasingly popular due to the prominent corresponding applications in a variety of fields such as computer vision, image processing, smart-home healthcare, and human–computer interactions. The essential goals of a video-based activity-recognition system include the provision of behavior-based information to enable functionality that proactively assists a person with his/her tasks. The target of this work is the development of a novel approach for human-activity recognition, whereby human-body-joint features that are extracted from depth videos are used. From silhouette images taken at every depth, the direction and magnitude features are first obtained from each connected body-joint pair so that they can be augmented later with motion direction, as well as with the magnitude features of each joint in the next frame. A generalized discriminant analysis (GDA) is applied to make the spatiotemporal features more robust, followed by the feeding of the time-sequence features into a Hidden Markov Model (HMM) for the training of each activity. Lastly, all of the trained-activity HMMs are used for depth-video activity recognition.

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