Triangulation
Method I
: intersect viewing rays in 3D,
minimize:
•
X
is the unknown 3D point
•
C
j
is the optical center of camera
j
•
V
j
is the
viewing ray
for pixel (
u
j
,
v
j
)
•
s
j
is unknown distance along
V
j
Advantage: geometrically intuitive
X