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Anai, Tetsuji
DYNAMIC ANALYSIS OF HUMAN MOTION USING HYBRID VIDEO THEODOLITE
Tetsuji ANAL, Hirofumi CHIKATSU
Tokyo Denki University, Japan
Department of Civil Engineering
{anai, chikatsu t@g.dendai.ac.jp
Working Group V/4
KEY WORDS: Hybrid Video Theodolite, Gait Analysis, Walking Elements, Walking Cycle, Skeleton Image.
ABSTRACT
Video image sequences often give important information about dynamics of human motion in the field of
rehabilitation or sports training. In order to understand dynamic analysis of the natural human motion from video
image sequences, the authors have been developing a Motorized Video Theodolite System and Digital Video
Camera. Furthermore, in order to acquire digital image sequences and camera rotation parameters
simultaneously, these systems were combined and applications for human gait analysis were investigated.
However, there were some issues for practical applications of this combined system. These problems include,
necessity of increased speed for tracking, 3D data acquisition, and synchronization of video image sequences and
camera rotation parameters while tracking.
With this objective, and for multiple applications such as 3D objects modeling or so on, Hbrid Video
Theodolite (HVT) System was developed by the authors. The applications of the HVT system for dynamic
analysis of human motion are investigated in this paper.
1 INTRODUCTION
Human motion analysis using video image sequence is one of the effective methods in the field of sports training
or rehabilitation. Generally, dynamic analysis of human motion using video image sequences has been
performed under the condition that camera position and rotation are fixed. Therefore, it is possible to calibrate
the camera parameter in advance. However, in order to analyze the most natural human motion, limitation for the
camera should be removed.
With this motive, the authors have been concentrating on developing a video theodolite system consisting of a
CCD camera, a theodolite and a video recorder. It have been concluded that the video theodolite system have
ability to determine camera parameters while recording a moving objects, and the effectiveness of the video
theodolite system for dynamic analysis of human motion have been demonstrated [Chikatsu and Murai, 1995,
Chikatsu and et. al, 1996, Anai and et al, 1998].
On the other hand, from the viewpoint of digital imaging, the digital video camera system for human motion
analysis have been developed by the authors, and the remarkable features of the digital video camera system
have been also demonstrated [Anai, Chikatsu and Murai, 1998]. Furthermore, in order to acquire digital
sequential images and camera rotation parameters simultaneously, digital video camera was mounted on the
motorized video theodolite, and human gait analyses have been performed [Anai and Chikatsu, 1999].
However, there are some issues, which need to be resolved before this combined system may become
operational in the field of sports training or rehabilitation. These problems include synchronization with the
video theodolite and digital video camera, increasing tracking speed and 3D data acquisition.
For this goal, and for multiple application such as 3D modeling, auto-tracking for moving object and real-time
positioning or so on, the Hybrid Video Theodolite (HVT) System was developed by the authors [Chikatsu and
Anai, 2000]. After brief describing the HVT, the effectiveness of the HVT System for human gait analysis are
investigated in this paper.
2 HYBRID VIDEO THEODOLITE (HVT) SYSTEM
The HVT system consists of 6 parts: sensor, pan head and tilt body, imaging, recording, control and monitors.
Figure 1 shows the configuration of the HVT System, and the remarkable points are as follows:
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B5. Amsterdam 2000.
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