计算机视觉
计算机视觉
ComputerVision
Lecture2:ImageFormation
张
超
张
超
信息科学技术学院 智能科学系
I FtiP
I
mage
F
orma
ti
on
P
rocess
•
Light conditions
•
Light
conditions
• Surfaceproperties
• Cameraoptics
•
Scene geometry
•
Scene
geometry
Otli f Td
O
u
tli
ne
f
or
T
o
d
ay
•
Properties of light
Properties
of
light
• Surfaceproperties
• PinholeCameraModel
– PerspectiveProjection
– AffineProjection
• Sensing
• HomogeneousCoordinates
•
Camera Parameters
•
Camera
Parameters
– IntrinsicParameters
Extrinsic
Parameters
–
Extrinsic
Parameters
• Radiometry
What is light?
What
is
light?
Electroma
g
netic radiation
(
EMR
)
movin
g
alon
g
g()gg
rays in space
R(λ) is EMR, measured in units of power (watts)
λ is wavelength
The visible light spectrum
The
visible
light
spectrum
•
We
“
see
”
electromagnetic radiation in a range of
We
see
electromagnetic
radiation
in
a
range
of
wavelengths
