Fig. 3.

Illustration of varying size image features. (a) Original fundus autofluorescence (FAF) image. (b) to (e) Image features with a sliding window size of $s_x*s_y=2*2$ pixels with (b) mean intensity, (c) angular second moment, (d) entropy, and (e) inverse difference moment extracted from gray-level co-occurrence matrix with $(dx,dy)=(\mathrm{3,3})$. (f) to (i) Image features with a sliding window size of $s_x*s_y=6*6$ pixels with (f) mean intensity, (g) angular second moment, (h) entropy, and (i) inverse difference moment extracted from gray-level co-occurrence matrix with $(dx,dy)=(\mathrm{5,5})$ pixels. (j) to (m) Image features with a sliding window size of $s_x*s_y=12*12$ pixels with (j) mean intensity, (k) angular second moment, (l) entropy, and (m) inverse difference moment extracted from gray-level co-occurrence matrix with $(dx,dy)=(\mathrm{7,7})$ pixels.