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Procedure of measuring glottis movement. (a) Original image frame. (b) Extraction of glottis. (c) Grayscale image. (d) Converting of black-white image with a grayscale threshold. (e) Inverted black-white image. (f) Removing of extra black punctae within the glottis. (g) Removing of the slim link around the glottis by using image erode. (h) Removing of small island by using an area threshold. (i) Rotation of the image. ((j) and (k)) Division of left and right part of glottis.
