Motion capture for human motion measuring by using single camera with triangle markers

Hidenori Takahashi; Takayuki Tanaka; Shun'ichi Kaneko

doi:10.1117/12.649782

6 December 2005 Motion capture for human motion measuring by using single camera with triangle markers

Hidenori Takahashi, Takayuki Tanaka, Shun'ichi Kaneko

Proceedings Volume 6049, Optomechatronic Sensors and Instrumentation; 60490U (2005) https://doi.org/10.1117/12.649782
Event: Optomechatronic Technologies 2005, 2005, Sapporo, Japan

Abstract

This study aims to realize a motion capture for measuring 3D human motions by using single camera. Although motion capture by using multiple cameras is widely used in sports field, medical field, engineering field and so on, optical motion capture method with one camera is not established. In this paper, the authors achieved a 3D motion capture by using one camera, named as Mono-MoCap (MMC), on the basis of two calibration methods and triangle markers which each length of side is given. The camera calibration methods made 3D coordinates transformation parameter and a lens distortion parameter with Modified DLT method. The triangle markers enabled to calculate a coordinate value of a depth direction on a camera coordinate. Experiments of 3D position measurement by using the MMC on a measurement space of cubic 2 m on each side show an average error of measurement of a center of gravity of a triangle marker was less than 2 mm. As compared with conventional motion capture method by using multiple cameras, the MMC has enough accuracy for 3D measurement. Also, by putting a triangle marker on each human joint, the MMC was able to capture a walking motion, a standing-up motion and a bending and stretching motion. In addition, a method using a triangle marker together with conventional spherical markers was proposed. Finally, a method to estimate a position of a marker by measuring the velocity of the marker was proposed in order to improve the accuracy of MMC.

Citation Download Citation

Hidenori Takahashi, Takayuki Tanaka, and Shun'ichi Kaneko "Motion capture for human motion measuring by using single camera with triangle markers", Proc. SPIE 6049, Optomechatronic Sensors and Instrumentation, 60490U (6 December 2005); https://doi.org/10.1117/12.649782

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KEYWORDS

Cameras

Motion measurement

Calibration

3D metrology

Radon

Imaging systems

Distortion

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