Precision of Marker-Based Finger Tracking for Broad Biomechanical Studies Using 6DOF Targets.

Abstract

In the production the hand is subjected to high loads, because connections between two parts are often done using fasteners. Biomechanical hand models can be found in literature, where systems using single marker tracking showed the highest accuracy. Our system is focused on target tracking, which means tracking of a rigid body with at least 4 markers. The paper therefore describes a 6DOF target tracking procedure and compares the results to a commercial available system within two studies. The first study (n=5) deals with calibrations that are captured for computational determination of anthropometric data. The results show, that the anthropometry is calculated accurate, with e.g. 1.28 mm difference in thickness compared to an anthropometer. The measurement seems reliable with a test-retest variability of less than 10%. The second study (n=5) estimate the accuracy and precision of the fingertips using a design to grasp cylinders. The fingertips penetrate the cylinder 0.8 mm with a RMSE of 2.59 mm. Thus it is possible to measure difference between a gentle and a strong touch.

Keywords: Motion Capturing, Multi-Body-System, Hand, Kinematics

DOI: 10.54941/ahfe1001902