106
3: Hua-mei Chen
O~'r------------------------.
· 100
100
200
a
b
c
Fig.3.17a-c. A pair of a Radarsat SAR (histogram equalized for display purposes), b IRS
PAN images, c the MI registration function along the rotation axis. Rotation angle along
absica is shown in degrees
a
0.22
0.2
0.18
0.16
~
0.14
0.12
0.1
0.08
·200
·100
0
Rotation angle
C
0.35
0.3
~ 0.25
0.2
100
200
· 100
b
o
Rotation angle
d
100
200
Fig.3.18a-d. a and b Partitioned SAR images. c and d the corresponding MI registration
functions along the rotation axis. In c and d, both rotation angles are represented in degrees
Mathematically, this can be expressed as follows:
Let a* = argmax {I (P,RT a )) and ai = argmax (1 (pi,RTa))
a
a
then a* = ai for every i ,
(3.2l)