A method of rapid, automatic extraction of consonantal articulatory trajectories from real-time magnetic resonance image sequences is described. Constriction location targets are estimated by identifying regions of maximally-dynamic correlated pixel activity along the palate, the alveolar ridge, and at the lips. Tissue movement into and out of the constriction location is estimated by calculating the change in mean pixel intensity in a circle located at the center of the region of interest. Closure and release gesture timings are estimated from landmarks in the velocity profile derived from the smoothed intensity function. We demonstrate the utility of the technique in the analysis of Italian intervocalic consonant production.
Bibliographic reference. Proctor, Michael / Lammert, Adam / Katsamanis, Athanasios / Goldstein, Louis / Hagedorn, Christina / Narayanan, Shrikanth (2011): "Direct estimation of articulatory kinematics from real-time magnetic resonance image sequences", In INTERSPEECH-2011, 281-284.