Eliminate small areas in a binary image

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Hi all,

 I have several binary images with small , middle and large  areas. I want to remove small areas  and for this I used the bwareaopen function. But the small size of some areas in an image is the middle size areas of others images . I wanted eliminate small areas using as parameter of function bwareaopen the value of the minimum area. For this, I wrote this code:

STATS = regionprops(BW, 'Area'); allareas=[STATS.Area]; min_area=min(allareas); BW2=bwareaopen(BW,min_area+1);

But the statement "min_area=min(allareas);" gives the error: "Index exceeds matrix dimensions."

Can someone tell me why the error? And how can I eliminate small for all images automatically?