This paper describes a system that performs depth measurement of complex objects, and presents preliminary results using the system to measure an electropalatograph (EPG) palate and the lower face of a speaker. The depth measurements can be used to enhance electropalatography images, to reconstruct the face shape on a screen where it can be observed from any angle, to allow automatic distance measurements on EPG patterns, and to derive acoustically-significant parameters such as mouth shape during speech. The system uses structured light (parallel lines with a carefully coded colour sequence) projected onto the object, which is then recorded with a video camera; the images are then post-processed. Although the essential aspects of this process are the same for static and dynamic objects, the two cases present different experimental problems. Calibration methods and factors affecting resolution are discussed, as is comparison of this system to an existing double-video projection system developed in Grenoble.
Keywords: Articulatory synthesis, face shape data, electropalatography, structured light
Bibliographic reference. Shadle, Christine H. / Carter, J. N. / Monks, T. P. / Field, J. (1993): "Depth measurement of face and palate by structured light", In EUROSPEECH'93, 1745-1748.