This document summarizes a research paper on blood vessel segmentation in fundus images using random forest classification. The proposed method uses six steps: 1) spatial calibration of fundus images, 2) image preprocessing including illumination equalization, denoising and contrast equalization, 3) optic disc removal, 4) candidate lesion extraction, 5) dynamic shape feature extraction, and 6) random forest classification of lesions. The method was tested on public Diaretdb1 fundus image database and achieved accurate segmentation and detection of microaneurysms and hemorrhages for early diagnosis of diabetic retinopathy.