how to find the smallest object in the coin image?

how to find the smallest object in the image below ? the code I wrote below does not work

A = imread('eight.tif');
C=imbinarize(A, 'adaptive', 'ForegroundPolarity', 'dark');
figure,imshow(C)

BW3=bwareafilt(C,1,'smallest');

Warning: One or more ties for n-th place occurred when selecting objects. Some objects were not selected.

figure, imshow(BW3)

Answer 1

[Matt J]

This should make it easier:

A = imread('eight.tif');
C=imbinarize(A, 'adaptive', 'ForegroundPolarity', 'dark');
C=bwareafilt( bwconvhull(~C,'objects') ,4);

figure,imshow(C)

[betty]

then it will be written like this, right ;

A = imread('eight.tif');
C=imbinarize(A, 'adaptive', 'ForegroundPolarity', 'dark');
F=bwareafilt( bwconvhull(~C,'objects') ,4);
figure,imshow(F)

BW3=bwareafilt(F,1,'smallest');
figure, imshow(BW3)

[Matt J]

Is it giving you the result that you want?

[betty]

yes, I think he finds the smallest object

[Matt J]

okay, well if you think the problem is solved, then please Accept-click the answer to indicate so.