Expand a coordinate array to be wider

Using bwboundary and regionprops, I have created a coordinate array of segmented objects "A". I have 64 "A" objects that have been segmented and I have their boundary coordinates (PixelList from regionprops). I am trying to elimate other objects "B" that are within 10 pixels of any "A" object. "A" and "B" never overlap but their close proximity has a negative effect on my final data analysis. Is there a way to expand on the "A" coordinate array so that I can separate A and B better?

Answer 1

[Matt J]

I'm assuming A and B are the struct output from regionprops:

Z=false(size(BW));

Aunion=Z;
for i=1:numel(A)

    Aunion(A(i).PixelIdxList)=1;
    
end

D=bwdist(Aunion)>=10;

discard=false(1,numel(B));
for i=1:numel(B)
    
    Bi=Z;
    Bi(B.PixelIdxList)=1;
    
    discard(i)=any(Bi(:)&D(:)); %test for intersection
        
end
    
B(discard)=[];