blobs filtering is not working

Using some examples in this forum , have put a script together. I like to keep some blobs and delete the rest. M is my gray scale image.

Part of my code is shown in below. When ran it, it left me one blob (one horz. line) in the image. It should leave me two blobs or two horizontal lines?. what is wrong? How to correct that?.

L = bwlabel(M,8); 
mymeasures = regionprops(L, 'Area', 'BoundingBox');
bb = mymeasures.BoundingBox;
Keepers = (bb(4) <= 2 || bb(3) <= 2) %... etc .. more conditins to be added later;
keepersIndexes = find(Keepers );   
keeperBlobsImage = ismember(L, keeperIndexes); 
M(~keeperBlobsImage) = 0;

this prints me the two blobs (or two horz. lines) I want to see.

mymeasures = regionprops(L, 'Area', 'BoundingBox');
for n = 1 : length(mymeasures)
bb = mymeasures(k).BoundingBox;
 if (bb(4) <= 2 || bb(3) <= 2)
   fprintf('Blob #%d %d\n', n, mymeasures(n).Area);
 end
end

Answer 1

[mW]

any ideas?