Hit-or-miss and Skeletons

Hit-or-miss transformations involve SEs composed of two sets: the first has to fit the object under study while the second has to miss it. Hence, the name fitand-miss would have been more appropriate. Hit-or-miss transformations are applied to binary images for extracting neighbourhood configurations such as those corresponding to isolated background and foreground pixels. Adding all pixels having a given configuration to an image leads to the definition of thickenings and subtracting them from the image defines the thinning operator.