Crop object from image

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I am using code something like this to detect and count object on image.

    BW = imread('blobs.png');
[B,L,N,A] = bwboundaries(BW);
figure, imshow(BW); hold on;
colors=['b' 'g' 'r' 'c' 'm' 'y'];
for k=1:length(B)
    boundary = B{k};
    cidx = mod(k,length(colors))+1;
    plot(boundary(:,2), boundary(:,1),...
         colors(cidx),'LineWidth',2);
    %randomize text position for better visibility
    rndRow = ceil(length(boundary)/(mod(rand*k,7)+1));
    col = boundary(rndRow,2); row = boundary(rndRow,1);
    h = text(col+1, row-1, num2str(L(row,col)));
    set(h,'Color',colors(cidx),...
        'FontSize',14,'FontWeight','bold');
end
figure; spy(A);