Resolution of problem with use of closing for texture segmentation

The morphological closing operation is widely known to be useful for separating regions containing high and low densities of particles. It is shown that the area of the region of high density becomes enlarged as the density of particles in the low density region increases-an effect that also occurs if impulse noise appears. It is found that the size increase is calculable and can approximately be cancelled by application of a suitable additional erosion operation, thereby improving the accuracy of the final representation