Analysis of Visual Appearance of Retinal Nerve Fibers in High Resolution Fundus Images: A Study on Normal Subjects

Table 3

The table summarizes the Spearman’s correlation coefficients computed from samples in particular image. The mean value, standard deviation, and minimum and maximum values are presented together with mean 𝑃 value. The described features (mean 𝜇, standard deviation 𝜎, and Shannon entropy 𝐸) were estimated in different channels (R, G, B, and GB).

Feature	𝑅𝑆 mean	𝑅𝑆 st. deviation	𝑅𝑆 min	𝑅𝑆 max	Mean P value
𝜇R	0.461	0.193	0.161	0.726	0.114
𝜎R	0.344	0.258	0.037	0.811	0.301
𝐸R	0.212	0.249	−0.205	0.583	0.387
𝜇G	0.758	0.088	0.621	0.867	0.001
𝜎G	0.706	0.110	0.563	0.873	0.002
𝐸G	0.646	0.104	0.492	0.830	0.006
𝜇B	0.750	0.116	0.516	0.874	0.003
𝜎B	0.702	0.107	0.549	0.872	0.002
𝐸B	0.566	0.241	−0.015	0.848	0.110
𝜇GB	0.765	0.099	0.590	0.874	0.001
𝜎GB	0.708	0.108	0.559	0.869	0.002
𝐸GB	0.657	0.096	0.531	0.844	0.004