System for tracking markers applied for kinematical human motion analysis

Pascual Figueroa


In this talk, I'm going to present a system for automatic tracking of markers, that we developed in the Laboratory of Instrumentamion for Biomechanics, University of Campinas, Brazil. This system is based on image sequence captured by a normal CCD camera and image processing algorithms. Markers can be defined as objets that are attached or fixed to human body. These markers help to track the movement of interested points of the body, for example, the joints. The importance of such systems is related to their application in different areas, such as clinical gait analysis, orthopedic, neurology, sports, etc.

In particular, commercial optoelectronic system based on markers and special cameras have been extensively used to record 3-D kinematics of the human motion. The tracking of the markers in most of these systems is accomplished using special purpose dedicated hardware and the applications are limited to a controlled environment. In our system we used the i.age-processtng tools, in particular, the mathematical morphology to treat the problem of tracking in an uncontrolled environment.

I'm going to show the sequence of algorithms that we developed and tested for different markers and different type of movements, such as walking, running, jumping, etc.

Maintained by Philippos Mordohai