Grey scale mathematical morphology methods are used to process fundus image. Morphology OPENCLOSE transform is used to erase high frequency noise, and TOP HAT transform is used to enhance blood vessels.

• 在对灰度眼底图象进行处理的过程中，形态学的OPENCLOSE变换被用来去除眼底图象中的高频噪声，TOP－HAT变换被用来进行血管突出。