Jiang Gao, Robert Collins, Alex Hauptmann and Howard Wactler,
"Articulated Motion Modeling for Activity Analysis,"
 IEEE Workshop on Articulated and NonRigid Motion, 
held in conjunction with CVPR'04, Washington, DC, 2004.


We propose an algorithm for articulated human motion segmentation that estimates parametric motions of body parts and segments images into moving regions accordingly. Our approach combines robust optical flow estimation, RANSAC, and region segmentation using color and Gaussian shape priors. This combination results in an algorithm that can robustly estimate and segment multiple motions, even for moving regions with small support and in lowresolution images. Based on the raw motion segmentation, consistent body motions are detected over time to characterize human activity. The effectiveness of this approach is demonstrated in a real scenario: characterizing dining activities of patients at a nursing home.

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