Retinal Vessel Diameter Measurement Using Unsupervised Linear Discriminant Analysis

Table 5

Cross-correlation comparison between the ULDM, manual measurements, and their average value.

		Observer 1	Observer 2	Observer 3	Obs_avg^a	ULDM
HRIS	Observer 1	1
	Observer 2	0.93	1
	Observer 3	0.91	0.94	1
	Obs_avg	0.97	0.98	0.97	1
	ULDM	0.83	0.86	0.87	0.87	1
CLRIS	Observer 1	1
	Observer 2	0.96	1
	Observer 3	0.97	0.96	1
	Obs_avg	0.99	0.98	0.99	1
	ULDM	0.89	0.88	0.89	0.90	1
VDIS	Observer 1	1
	Observer 2	0.93	1
	Observer 3	0.92	0.90	1
	Obs_avg	0.97	0.97	0.96	1
	ULDM	0.88	0.90	0.87	0.91	1
KPIS	Observer 1	1
	Observer 2	0.69	1
	Observer 3	0.65	0.64	1
	Obs_avg	0.90	0.87	0.87	1
	ULDM	0.50	0.47	0.41	0.52	1

^aObs_avg is the data sequence containing average of vessel diameters measured by the three observers for each vessel cross-section.