Image Processing Reference
In-Depth Information
Fig. 4.4
Performance evaluation of the scheme of input-based band selection for various values of
κ
.
a
entropy measure, and
b
average gradient
F
x
2
XY
x
1
F
y
2
¯
=
+
,
g
(4.11)
y
where
F
x
is the gradient of
F
along the
x
-axis. This quantity
g
is called average
gradient which evaluates the quality of the image by measuring its gradient at all
pixels. We can make a similar observation from Fig.
4.4
basinFig.
4.4
a which shows
the variation in the values of average gradient for various values of the threshold
parameter
¯
.
We shall compare the resultant fused images for various values of the threshold
parameter
κ
to examine the quality of the fused images, and thus, to examine the
efficiency of the band selection technique. Consider fused images for various values
of the threshold parameter
κ
, as well as the same resulting from fusion of the entire
dataset (without any band selection) when
κ
κ
=
0 using the same fusion method.
The result with
κ
=
0 is considered as the reference image and the radiometric
