From: Camera calibration with coplanar conics: a unified explanation and ambiguity analysis
Conics
C 1
C 2
C 3
C 4
C 5
{a,b}, 4
{a,c}, 6
{a,f}, 12
{b,c}, 6
C 6
{c,d}, 6
{b,f}, 6
{d,f}, 6
{e,f}, 4
C 7
{b,d}, 4
{c,f}, 6
{b,e}, 6
{a,e}, 12