![]() In addition, a method using a triangle marker together with conventional spherical markers was proposed. 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. As compared with conventional motion capture method by using multiple cameras, the MMC has enough accuracy for 3D measurement. 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. The triangle markers enabled to calculate a coordinate value of a depth direction on a camera coordinate. The camera calibration methods made 3D coordinates transformation parameter and a lens distortion parameter with Modified DLT method. 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. 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. ![]() This study aims to realize a motion capture for measuring 3D human motions by using single camera. Takahashi, Hidenori Tanaka, Takayuki Kaneko, Shun'ichi Motion capture for human motion measuring by using single camera with triangle markers
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