I. INTRODUCTION
This work aims to automatically track the movement of speed skaters on an indoor ice rink and to present this data in a comprehensive and synthetized way to coaches. From the computer vision point of view, several problems present themselves: partial occlusions when skaters are very close to each other; the size of the skaters range from about 20 by 20 pixels to 50 by 50 pixels; skaters are often tracked simultaneously in two or more cameras; the calibration of the cameras in such a large area. From a user-centric point of view, the problems are related to the usability of the system; manipulation, correction and management of the data series; potential integration of external systems; creation of simple yet useful tools to assess performance from trajectories.
The remainder of this paper is organized as follows: the next section explore the related work in sports. Section II is the overview of the proposed system. Section IV explains the camera calibration is carried out using GIS-style image rectification. Section V describes the tracking method based on particle filtering and introduces the notion of instant center of rotation as a part of the dynamics model. Section VI shows the geometric and power balance models of simulated data that provides a basis for human