Digital Signal Processing Reference
In-Depth Information
Fig. 10.14
Repartition in the
H
−
α
plane after classification, AM and GM, 15
x
15
sented in Fig.
10.11
. The red curve represents the limit of entropy-
couples that are
physically possible. The dotted blue lines roughly delimit areas where different scat-
tering mechanisms take place. These boundaries are not set in stone but offer a rather
quick and visual separation between mechanisms.
The repartition of the pixels in each class in the
H
α
−
α
plane after the classification
ended are presented on Fig.
10.12
for the arithmetical mean and on Fig.
10.13
for the
geometrical mean.
If we take a closer look at the most pertinent classes, like the dark and light blue
classes, we can see that the pixels belonging to these classes appear to be more
clustered. For the dark blue class, the range in both alpha and entropy is reduced,
which means that the pixels belonging to this class are more similar in the polarimetric
sense. This was expected as the classification appeared to refine the class around the
corner reflectors. For the other classes, the deviations in alpha and entropy are roughly
the same using either one of the means. We can take a look at the repartition using the
15-by-15 sliding window, represented on Fig.
10.14
. Only the red and green classes
