I have an image like the one above, and what I need to find are the red circled areas. They are caused by how the nerve layer is in the eye, and I have no idea what method to use to extract them. (I am looking for a brighter background from the nerve layer) I have found all the blood vessels, so I can ignore those area easily. But I don't have any concept of how to begin the search for these areas. Note that the bright spots on the right top side (lets say 12 o clock / 1 o clock from the image center) are not caused by the nerve layer, but from being in a young persons eye.
Can someone point me to a method to extract these areas? Note that the areas could also be non-existant, or be formed like a cross, or like an hourglass.