Feature-Based Retinal Image Registration Using D-Saddle Feature

Figure 6

(a) Pixels’ position of inner and outer rings for candidate point, p [28]. (b) Yellow dots represent pixels with the intensity slightly lower than the intensity in blue dots. (c) Red dots represent pixels within the central intensity and its offset , whereas yellow and blue dots represent pixels with the intensity slightly lower and higher than red dots, respectively.

(a)

(b)

(c)