Table 3. Breakdown of training samples used.

Classifier	Images used	Sub-region used	Training sample type	Testing images for EA
Blood vessel (G)	300	2789	Image regions	1000
Microaneurysms (G)	100	2100	15×15 sub-images	1500
Haemorrhage (G)	278	1785	Image regions	1000
Background (L)	300	1750	32×32 sub-images	1000
Dark lesion (L)	278	2100	32×32 sub-images	1000
Blood vessel (L)	300	4210	32×32 sub-images	1000
Bright lesion(L)	250	1889	32×32 sub-images	1000

G and L indicate the corresponding classifier is either global or local classifier.