• erode—Wears away the edges of an image.

• dilate—Enlarges light objects in an image or reassembles an image which has become disjointed.

• open, close—Performs binary morphological opening or closing of an image.

• thin, skeleton—Transforms objects in an image into a set of lines that run roughly down the center of each object.

• gray_close, gray_dilate, gray_erode, gray_open—Performs grayscale morphological operations on images.