Removes 4 pixels size isolated black dots in the 8 directions: E, NE, SE, S, SW, W, NW, N on a GdPicture image or into an area of a GdPicture image defined by SetROI() function. 

This function should be use only on bitonal images.

public GdPictureStatus FxBitonalRemoveIsolatedDots2x2(
    int ImageID
);

Public Function FxBitonalRemoveIsolatedDots2x2(
    ByVal ImageID As Integer
) As GdPictureStatus

A member of the GdPictureStatus enumeration.