Video-scanning system for measurement of lip and jaw motion

Abstract

An instrument for measuring labial and mandibular positions during speech is described. A modified video system is used to measure the positions of small reflecting glass beads attached at selected points on the face and to a thin wire anchored on a mandibular tooth. The system allows continuous data collection from up to 16 reflector points at a sampling rate of 100 Hz. Reflector movements with instantaneous velocities up to 45 cm/sec can be determined with a 0.3-mm resolution. Techniques for data acquisition and analysis and display are described.