Retinal Vessel Diameter Measurement Using Unsupervised Linear Discriminant Analysis

Table 4

Comparison of vessel diameter measurement accuracy and precision between the proposed ULDM, established techniques, and manual measurement for the KPIS database^a.

KPIS database
Method name	Success rate (%)	Diameter		Difference
		Average 𝜇1	SD 𝜎1	Average 𝜇2	SD 𝜎2
Observer 1	100	7.97	0.47	0.45	0.234
Observer 2	100	7.60	0.42	0.08	0.213
Observer 3	100	7.00	0.52	−0.52	0.233
HHFW	96.3	6.47	—	−1.05	0.389
1D Gaussian	100	4.95	—	−2.57	0.399
2D Gaussian	100	5.87	—	−1.65	0.337
ESP method	100	6.56	—	−0.96	0.328
Graph-based method	99.4	6.38	0.59	−1.14	0.67
Proposed ULDM	100	7.02	0.67	−0.50	0.60