Retinal Vessel Diameter Measurement Using Unsupervised Linear Discriminant Analysis

Table 2

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

CLRIS database
Method name	Success rate (%)	Diameter		Difference
		Average 𝜇1	SD 𝜎1	Average 𝜇2	SD 𝜎2
Observer 1	100	13.19	4.01	−0.61	0.566
Observer 2	100	13.69	4.22	−0.11	0.698
Observer 3	100	14.52	4.26	0.72	0.566
HHFW	0	—	—	—	—
1D Gaussian	98.6	6.3	—	−7.5	4.137
2D Gaussian	26.27	7.0	—	−6.8	6.019
ESP method	93.0	15.7	—	−1.90	1.469
Graph-based method	94.1	14.05	4.47	0.08	1.78
Proposed ULDM	98.2	13.23	3.55	−0.55	1.79