detection of exudates in retinal images

Hi I need to detect exudates from retinal images using morphological methods.There is a problem in overlaying of a binary image on a grayscale image.There is also a problem in morphological reconstruction of a image. Can anyone help me?

Answer 1

[Image Analyst]

To overlay an image, see http://blogs.mathworks.com/steve/2009/02/18/image-overlay-using-transparency/

To use imreconstruct(), see my attached demos, below in blue text.