Assembly: AForge.Imaging (in AForge.Imaging.dll) Version: 18.104.22.168 (22.214.171.124)
Applied to binary image, the filter may be used connect or fill objects. Since dilatation is used first, it may connect/fill object areas. Then erosion restores objects. But since dilatation may connect something before, erosion may not remove after that because of the formed connection.
// create filter Closing filter = new Closing( ); // apply the filter filter.Apply( image );