MATLAB: Using Watershed to seperate Ellipsis

ellipsisimage processingImage Processing Toolboxwatershed

Hi, I habe a problem regarding the watershed-function…
I tried it with circles, which worked basically as I intended.
Now I want to seperate ellipsis, but it doesn't work…
Here's the code I used:
bw = imread('111.jpg'); % read Image
bw=im2bw(bw); % Binarize
bw=~bw; % invert
%% Smooth edges
windowSize = 51;
kernel = ones(windowSize) / windowSize ^ 2;
blurryImage = conv2(single(bw), kernel, 'same');
binaryImage = blurryImage > 0.8; % Rethreshold
%% Using the Watershed function as the Matlab-help suggests
bw = binaryImage;
D = bwdist(~bw);
D = -D;
D(~bw) = Inf;
L = watershed(D);
L(~bw) = 0;
rgb = label2rgb(L,'jet',[.5 .5 .5]);
It doesn't really separate the ellipsis, does it even work for objects that aren't circles?
If it does, has anybody an idea how to solve this problem?
Thanks in advance and best regards
Karsten

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