Warning using bwareafilt: "Some objects were not selected"

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Nut on 20 Jan 2017
Commented: Walter Roberson on 20 Jan 2017
I'm using the function bwareafilt to select the twelve largest objects on a binary image. Sometimes, this warning occurs:
Warning: One or more ties for n-th place occurred when selecting objects. Some objects were not selected.
What does it mean, in details? It seems it doesn't affect my processing, I can't observe any visible effect.
And how can I avoid its occurrence?
Thanks for your answers, warm regards.

Accepted Answer

Anand on 20 Jan 2017
This typically means there were 2 or more objects with the same area, i.e. a tie. So bwareafilt had to pick some and leave out the rest.
For example, if image BW has 5 objects of areas 10, 15, 15, 20 and 25 and you ask for the 3 largest objects, you will get the warning. This is because only one among the 2 objects with area 15 was picked.
BW = [true(1,10),false,true(1,15),false,true(1,15),false,true(1,20),false,true(1,25)];
BWsel = bwareafilt(BW,3);
Walter Roberson
Walter Roberson on 20 Jan 2017
After you run the area filter, ask for the area of all of the results, take max and min, and then go back and rerun the area filter using that max and min instead of asking for such and such a number of results.

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