Eye Disk Segmentation Using Luminance Channel and Active Contour

This program try to segment eye disk area using two method: luminance based and active contour. For the active contour I use Snake by Dirk-Jan Kroon (https://www.mathworks.com/matlabcentral/fileexchange/28149-snake---active-contour)
The algorithm I propose is as follows:
- Convert the color image from RGB to HSL channel
- To remove the artery, use morphological closing algorithm
- The make the image even smoother, use median filter to smooth the image
- Using the help from histogram, find the brightest area to some extend and detect it as the eye disk area
- For the use of active contour, the I use the smoothed image and the brightest pixel point to make the initial contour
To run the program, please open 'mainprogram.m'
This program is still on development and still far from perfect. I am open to any suggestion so if you have any suggestion, please tell me.
For the retinal image, there are many datasets you can get. For example is DRIVE dataset that you can get in http://www.isi.uu.nl/Research/Databases/DRIVE/