16-11-2010, 09:30 PM
INTRODUCTION
Image Reconstruction
As name implies it is the process of reconstructing the three dimensional
shape of a single frame image.
principle
The principle of 3D-reconstruction is that, the object's three dimensions
are acquired by the conversion from the shade of gray to the depth of the
information of the image.
THREE-DIMENSIONAL SHAPE RECOVERY.pdf (Size: 120.94 KB / Downloads: 70)
The basic design concept
The object surface shadeof gray can be expressed as
E(x,y) = I(x,y)cos
Where
I(x,y) = Light intensity of the optical source.
= Object surface re
ectivity.
= Included angle between optical source and object surface vertical
vector
The value of cos on the basis of inner product space is
cos = p ppi+qqi+1
p2+q2+1
p
p2
i +q2
i +1
The direction of the surface vertical vector of the brightest point of the
image is calculated as
Ei = I cos i
Emax = I coss
Where
s = Source tilt angle
i = Source tilt angle at point i
Suppose any part of the image is sphere
The coordinate of any point i on the surface is (xi ; yi ; zi )
Where
xi = x0 + r sin i cos(i