On the determination of 3D trajectory of moving targets by stereovision

This paper describes a vision system to obtain the 3D trajectory of a moving target by stereovision. For our study, we chose to reconstruct the trajectory of a clay plate that is used in ball-trap. The plate´s path can reach 60 meters in length. The trajectory is reconstructed from videos of the moving target and plate positions between the left and right images at different times. To find the 3D coordinates of the plate, we use a triangulation algorithm on couple of points that were found prior. To obtain the whole trajectory of the object, we use a spline interpolation. Our stereovision system is very simple, it uses two classical webcams with a resolution of 640*480 pixels at 30 frames per second. We present in this paper the architecture of the developed system and show its efficiency through experimental results. We conclude with some perspectives for improvement in future work.