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    <p>You might want to consider Active Contours. This will give you a continous boundary of the object rather than patchy edges. </p> <p>Below are links to </p> <p>A book:</p> <p><a href="http://www.amazon.co.uk/Active-Contours-Application-Techniques-Statistics/dp/1447115570/ref=sr_1_fkmr2_1?ie=UTF8&amp;qid=1377248739&amp;sr=8-1-fkmr2&amp;keywords=Active+shape+models+Andrew+Blake%2C+Michael+Isard" rel="nofollow">http://www.amazon.co.uk/Active-Contours-Application-Techniques-Statistics/dp/1447115570/ref=sr_1_fkmr2_1?ie=UTF8&amp;qid=1377248739&amp;sr=8-1-fkmr2&amp;keywords=Active+shape+models+Andrew+Blake%2C+Michael+Isard</a></p> <p>A demo: <a href="http://users.ecs.soton.ac.uk/msn/book/new_demo/Snakes/" rel="nofollow">http://users.ecs.soton.ac.uk/msn/book/new_demo/Snakes/</a></p> <p>and some Matlab code on the File Exchange: <a href="http://www.mathworks.co.uk/matlabcentral/fileexchange/28149-snake-active-contour" rel="nofollow">http://www.mathworks.co.uk/matlabcentral/fileexchange/28149-snake-active-contour</a></p> <p>and a link to a description on how to implement it: <a href="http://www.cb.uu.se/~cris/blog/index.php/archives/217" rel="nofollow">http://www.cb.uu.se/~cris/blog/index.php/archives/217</a></p> <p>Using the implementation on the File Exchange, you can get something like this:</p> <pre><code>%% Load the image % You could use the segmented image obtained previously % and then apply the snake on that (although I use the original image). % This will probably make the snake work better and the edges % in your image is not that well defined. % Make sure the original and the segmented image % have the same size. They don't at the moment I = imread('33kew0g.jpg'); % Convert the image to double data type I = im2double(I); % Show the image and select some points with the mouse (at least 4) % figure, imshow(I); [y,x] = getpts; % I have pre-selected the coordinates already x = [ 525.8445 473.3837 413.4284 318.9989 212.5783 140.6320 62.6902 32.7125 55.1957 98.6633 164.6141 217.0749 317.5000 428.4172 494.3680 527.3434 561.8177 545.3300]; y = [ 435.9251 510.8691 570.8244 561.8311 570.8244 554.3367 476.3949 390.9586 311.5179 190.1085 113.6655 91.1823 98.6767 106.1711 142.1443 218.5872 296.5291 375.9698]; % Make an array with the selected coordinates P=[x(:) y(:)]; %% Start Snake Process % You probably have to fiddle with the parameters % a bit more that I have Options=struct; Options.Verbose=true; Options.Iterations=1000; Options.Delta = 0.02; Options.Alpha = 0.5; Options.Beta = 0.2; figure(1); [O,J]=Snake2D(I,P,Options); </code></pre>
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