Problem in Image Segmentation in an image?

I am using a code that can segment sclera from an eye image and it works fine for the first image The code that i use is as follows

but when i input this image it can't give me the result. What should i do?

Answer 1

[Image Analyst]

Like I said in your duplicate question http://www.mathworks.com/matlabcentral/answers/130082#comment_234403

"Keep working on it. Did you see the link to papers from people have have presumably solved it? It looks like color alone won't solve it if you need to find sclera that is reddish so you may have to combine with other methods like spatial location or edge detection. Maybe you have to locate the iris first and look outwards from there. I can see that it could be a very challenging problem to automatically get every possible pathological image absolutely correct. As a last resort you may have to resort to using imfreehand(). Let me know if you want a demo of that. The good thing is that if you resort to doing it manually, there aren't many images since each patient will have only a few images at most, not hundreds or thousands."

[Asif Hasan]

How can i modify this code for iris localization sir? @image analist

[Image Analyst]

I don't have any code for iris location - I don't do that kind of biometric work. Search this forum for tag "iris", or search Vision Bib: http://www.visionbib.com/bibliography/contentspeople.html#Face%20Recognition,%20Detection,%20Tracking,%20Gesture%20Recognition,%20Fingerprints,%20Biometrics