# How to find the lower eyelid in an image?

I have an image of 480x360 px that contains eye portion only i.e., sclera iris, pupil, eyebrows etc. Now I have to find the lower eyelid in the image.

What I've done till now is that cut the image in 2 parts upper and lower half. Now apply edge detector (Canny) on lower part and then parabola fitting on the resultant image.

I am getting ok results but eyelid is not parabola so sometimes the parabola goes into the sclera region also.

I am thinking to doing curve fitting but a better idea looks like funding a curved line in the edge map.

Can you help in finding the curved line in the edge map ?

• Do you have any example images showing the problem and your current solution & results? – Chris Jun 6 '12 at 14:48
• You should look into "Template Matchig" Its a machine learning skill that would be used for this. – CyberMen Jun 11 '12 at 15:57
• You could try to perform smoothing B-spline fitting – heltonbiker Jul 5 '12 at 20:52

• Thanks @MarcusMüller : The reason link-only answers are bad is that it makes it nearly impossible to find the information once the link dies. Adding additional information (like the full citation you've added) means I can search for $that$ instead and actually find the information linked to rather than a 404 error. – Peter K. Oct 14 '15 at 16:40