Fig. 2
From: Choroidal structural changes correlate with severity of diabetic retinopathy in diabetes mellitus
Enhanced depth imaging (EDI)-OCT image and converted binary image of a normal healthy eye. An EDI-OCT image of a healthy eye (a) was converted to a binary image (b) using the ImageJ software. The luminal area (dark area, asterisk) and the interstitial area (cross) are seen. The rectangle surrounded by a red line was excised, and the dark areas were traced by the Niblack method ([c], brown area). The binarized image (b) and the margin of traced area (c) were merged, and the merged image shows that the traced areas coincide with the dark choroidal areas of the OCT image (d)