The present invention relates to a collision force analysis (CFA) method for obtaining in vivoestimates of contact force and pressure in the vocal cords directly from laryngeal videoendoscopies. The method comprises the steps of: providing at least a high-speed laryngeal videoendoscopy (also called High Speed Videoendoscopy or HSV) to generate at least one image and videos of the vocal cords； pre-processing the image in a processing unit, to define a region of interest (ROI) of the location of the glottis； detecting in the processing unit, the edges of the vocal folds in the images obtained by means of the HSV； recording in the processing unit, the points of the edges detected by means of a sequence of images； estimating in the processing unit, the path of the vocal cord edge during collision throughout time； and estimating the values of contact and impact of the vocal cords by means of a collision model.
