rotation angle for the image-of 2.5 m pixel
resolution resampled from the 2.5 m pixel
resolution test image.
4-1 0 100m
EN ec
-2
= 3
NES
m 4
EM 5
EN 6c
EN 7
Test image of buildings of the
(2:1 rectangles).
10
Figure 8.
same shape
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A
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en
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0 i i + i + } +
0 10 20 30 40 50 60° 70 80 90
Rotation Angle (degree)
Figure 9. Flongatedness plotted against the
rotation angle for the image of 10 m pixel
resolution.
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0 10 20 30 40 50 60 70 80:90
Rotation Angle (degree)
Figure 10. Elongatedness plotted against
the rotation angle for the image of 2.5 m
pixel resolution resampled from the 10 m
pixel resolution test image.
572
2:1 Rectangles
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um... "gb nn Ne =
% VR
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Elongatedness (x 4 x )
©
1 1 A
20 30°40 50 60 70
Rotation Angle (degree)
Figure 11. Elongatedness plotted against
the rotation angle for the image of 2.5 m
pixel resolution resampled from the 2.5 m
pixel resolution test image.
EN
=
=
m
=
=
vd
—
c
0 ^10 80
Figure 12. Test image of 10 m pixel
resolution displayed on a computer screen.
RULE 1
IF (area) IS (medium) AND
(elongatedness) IS (small) AND
(perimeter straightness) IS (medium)
(diagonal length of MBR) is (medium)
THEN
(object is a building)
AND
CE = 0,5
The role of the rules is to identify a
portion of the n-dimensional space spanned
by n descriptors as shown in Figure 13 for
a particular building candidate, to
calculate its probability as building,
to conclude whether or not it is a
building.
and
