Introductory Techniques for 3-D Computer Vision
Introductory Techniques for 3-D Computer Vision
Multiple View Geometry in Computer Vision
Multiple View Geometry in Computer Vision
Self-calibration using a particular motion of camera
WSEAS Transactions on Computer Research
Analysis and interpretation of ground reaction forces in normal gait
WSEAS TRANSACTIONS on SYSTEMS
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This paper presents simple, inexpensive, and fast procedure for motion kinematics analysis and measurement [1,2]. Measurement system developed in our laboratory was based on the industrial high speed camera, an active LED markers and a PC for handling the camera and data analysis. Active markers used in this work are assembled using small and lightweight white LEDs that allow large density of markers to be attached on a subject, thus tracking position and orientation of all segments relevant for motion kinematic analysis. Computer vision algorithm for marker detection and tracking was developed, followed by an algorithm for computing and analyzing kinematics data of human locomotion [3,4,5]. Procedures for camera calibration and sub pixel accuracy were also developed and integrated with the system. Accuracy and properties of our system was trialed, and results were compared with the existing referent systems used in the field. Proposed system has a few disadvantages; measurements and results that are representative in only one plane and use of battery powered active markers that could disturb subject during normal gait trial. As a greatest advantage, our system offers speed and accuracy that is comparable with the other commercially available systems at lower price [6,7,8]. Further development of our system will include additional cameras for 3D marker tracking and integration with an inertial sensor for full kinematics and kinetic measurement of a human movement.