Figure 4
From: A Method of Drusen Measurement Based on the Geometry of Fundus Reflectance
Clinical case of drusen. A) Standardized color image with the inner, middle and outer regions of the Wisconsin template. Multiple large, soft drusen are present; B) the same image contrast-enhanced in Photoshop to assist in drusen identification. Note that pigment figures also stand out in this image; C) Final segmentation in the green channel after luteal correction and macular background leveling in the combined middle and central subfields, and choice of a global threshold. Close inspection shows small errors of segmentation and/or drusen boundaries with this threshold, but these are rather randomly distributed between the central and middle subfields, as well as between the four quadrants. There do not appear to be noticeable systematic errors here.