Table 4.

Feature symbols for each feature set obtained by sequential AUC maximisation for optic disc and optic cup region determination

Optic disc	Optic cup
${\mathcal{N}}_R\left(16\right)$, I mn(4, 8),	${\mathcal{N}}_R\left(16\right)$, ${\mathcal{N}}_{\mathrm{xxR}}\left(16\right)$,
B Y (4, 8), L u,uG(8),	Γ16,4,G, L u,uG(8),
${\mathcal{N}}_G\left(16\right)$, L uuG(16),	B Y (4, 7),I mn(4, 8),
L qq,γ−normR(16),	L uv,vuG(16), ${\mathcal{N}}_G\left(16\right)$,
I mn(4, 7), B Y (4, 7),	I mn(4, 7), I mn(3, 7), ${\mathcal{N}}_R\left(8\right)$,
L uvR(4), L uv,vuG(2),	${\mathcal{N}}_G\left(16\right)$, ${\mathcal{N}}_{\mathrm{yG}}\left(8\right)$,
L uuG(2), L uvG(4),	${\mathcal{N}}_{\mathrm{yyG}}\left(16\right)$, ${\mathcal{N}}_{\mathrm{xxR}}\left(8\right)$,
L uuR(16), L uv,vuR(16),	L qq,γ−normG(8),
L uv,vuG(16), Γ8,4,R,	R G(4, 8), ${\mathcal{N}}_{\mathrm{xxG}}\left(16\right)$,
L qq,γ−normG(16), Γ4,2,G,	Γ16,4,G
L uv,vuR(8)