Holes, HoleArea, Perforation  
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Menu:   Measure > Parameters  
Script:   SelectParam ("Holes", "HoleArea", "Perforation")  

Select these parameters to compute the number and area of holes in objects in Blob Measurements
Holes are defined as 4-connected regions of background pixels located inside the blobs.

returns the number of holes found in the object.

HoleArea returns the area of holes found in the object

Perforation returns the ratio of the area of holes divided by the outline area
.of the object.