Abstract
Diabetic retinopathy is an eye problem that face by the diabetic's patient. Diabetic Retinopathy (DR) is caused by the changes of the blood vessel in the retina. In the early stage of DR, the blood vessels may swell and leak fluid. However, in the advance stage of DR a new blood vessel that fragile and abnormal may formed and leaks blood to the retina. This can caused vision loss or even blindness. Therefore, this paper proposed to extract the blood vessel based on the peak and valley detection. The proposed methods utilized a green channel image and the inversion image. Next, the resulting images from both methods are combined. Three (3) databases are utilized namely from STructured Analysis of the Retina (STARE), Digital Retina Images for Vessel Extraction (DRIVE) and a database that is acquired from the local hospital.