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Human Legs Motion Estimation by using a Single Camera and a Planar Mirror  

Lee, Seok-Jun (경북대학교 컴퓨터공학과)
Lee, Sung-Soo (경북대학교 전자전기컴퓨터학부)
Kang, Sun-Ho (경북대학교 전자전기컴퓨터학부)
Jung, Soon-Ki (경북대학교 컴퓨터학부)
Publication Information
Journal of KIISE:Computing Practices and Letters / v.16, no.11, 2010 , pp. 1131-1135 More about this Journal
Abstract
This paper presents a method to capture the posture of the human lower-limbs on the 3D space by using a single camera and a planar mirror. The system estimates the pose of the camera facing the mirror by using four coplanar IR markers attached on the planar mirror. After that, the training space is set up based on the relationship between the mirror and the camera. When a patient steps on the weight board, the system obtains relative position between patients' feet. The markers are attached on the sides of both legs, so that some markers are invisible from the camera due to the self-occlusion. The reflections of the markers on the mirror can partially resolve the above problem with a single camera system. The 3D positions of the markers are estimated by using the geometric information of the camera on the training space. Finally the system estimates and visualizes the posture and motion of the both legs based on the 3D marker positions.
Keywords
Motion Capture; Rehabilitation System; Computer Vision;
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