Ying Chen
x 1 1 1
a = Sa. * Ax, fr. ep mir. ra, |
i 1
Hig = Ye. * Ax, X ria) ; (8)
& 1
MES M, (6. tAy ya i)
izl J
Where, Al,Axand Ay could be soluted by chain code; x and y indicate centralized coordinates.
The scale moment invariant, which has been normalized, can be expressed as:
Hp
Toa 7, pq
Hoo
Le.
Hp
Then the following scale and rotation invariant line moments can be derived to be,
À = ho + My |
9, 7 (7b, MY +47;
Wei Wen and A.Lozzi[1993] also presented two important invariant line moments. They could be used as matching
primitives. Considering scale invariance and change them to:
Jb
+ ———
2
J^
2
On ax
min
a
2
ó
2 ©)
2 MATCHING AND CONSTRAINTS
In order to obtain a correct matching between different sensor images (reference image b and real-time image r),
following vector spatial distances would be selected. And the measurement criterion is that the total of these vector
spatial distances is minimum.
> D, (i,j)< MIN (10)
k=]
lp G0) — $7 (|
DG Ds ;
i pas ai
Gran BD DU]
D 2 (4, ) = f
m ple + 42
ur Ol uli) = dou 67)
D. (i, ) =
p-b: 0s $.I.CD
(11)
where: Parameters i and j indicate the ith and the jth edge in image b and r respectively.
180 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B3. Amsterdam 2000.