==================== ======== ==================
Subkey               Default  Options           
==================== ======== ==================
mask                 subtract subtract, multiply
segtype              None     None, Ring        
segradius            5        Integer > 0       
N_blobs              1        Integer > 0       
fillholes            True     True, False       
remove_small_objects False    True, False       
min_object_size      2        Integer > 0       
==================== ======== ==================