SYSTEM AND METHOD FOR MEASURING TRACKER SYSTEM ACCURACY

摘要

The present invention relates to a simple and effective system and method for measuring camera based tracker system accuracy, especially for a helmet-mounted tracker system, utilizing Coordinate Measuring Machine (CMM). The method comprises the steps of; computing spatial relation between tracked object and calibration pattern using CMM; computing relation between reference camera and tracker camera; computing relation between reference camera and calibration pattern; computing ground truth relation between tracker camera and tracked object; obtaining actual tracker system results; comparing these results with the ground truth relations and finding accuracy of the tracker system; recording accuracy results; testing if the accuracy results is a new calculation required. The system comprises; a reference camera; a calibration pattern visible by reference camera; a camera spatial relation computation unit; a relative spatial relation computation unit a memory unit; a spatial relation comparison unit.

主权项

1. A system for measuring tracker system accuracy that exploits CMM in computing relative pose of calibration patterns with tracked objects comprising;
at least one camera spatial relation computation unit which is connected to at least one camera and configured to compute spatial relation between an object having a tracking pattern and a camera using the object's electronic pixel image acquired by these cameras, at least one spatial relation computation unit, that computes the pose of the tracked object with respect to a pre-defined coordinate system using camera spatial relation computation unit, at least one reference camera configured to acquire at least one electronic pixel image of a calibration pattern mounted on at least one tracked object and one tracked object, being tracked by a tracker camera, at least one calibration pattern which is visible by reference camera, for which the spatial relation with respect to tracked object is measured with a CMM, at least one ground truth pose value computed via the calibration pattern and the aforementioned CMM measurements, at least one memory unit configured to store at least one ground truth pose value and accuracy value, at least one spatial relation comparison unit configured to compare the tracker system's results with a given ground truth, finding an accuracy value.