Retinal Vessel Diameter Measurement Using Unsupervised Linear Discriminant Analysis

Table 1

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

HRIS database
Method name	Success rate (%)	Diameter		Difference
		Average 𝜇1	SD 𝜎1	Average 𝜇2	SD 𝜎2
Observer 1	100	4.12	1.25	−0.23	0.288
Observer 2	100	4.35	1.35	0.002	0.256
Observer 3	100	4.58	1.26	0.23	0.285
HHFW	88.3	4.97	—	0.62	0.926
1D Gaussian	99.6	3.81	—	−0.54	4.137
2D Gaussian	98.9	4.18	—	−0.17	6.019
ESP method	99.7	4.63	—	0.28	0.42
Graph-based method	100	4.56	1.30	0.21	0.567
Proposed ULDM	99.6	4.19	1.35	0.21	0.79