Vocal folds oscillation crucially influences all the basic qualities of voice, such as pitch and loudness, as well as the spectrum. Stroboscopy provides the standard view of the larynx. Videokymography is a new diagnostic tool developed to overcome specific limitations of stroboscopy in severely dysphonic patients with an aperiodic signal. It registers the movements of the vocal folds with a high time resolution on a line perpendicular to the glottis. The main focus of this paper is on measuring and tracking quantitative parameters for objective vocal fold function assessment from videokymographic (VKG) examinations of subjects with normal and pathological laryngeal function. Active contour search is realised, by properly adjusted snake algorithm. Examples are reported, showing the robustness and reliability of the proposed technique.