The images obtained through the relation (2) are shown in
Fig. 5. It is possible to see how the images showing more spatial
details are those obtained by using the second and the third principal
component (Figs. 5b and 5c). Figure 5a does not
contain any spatial detail; this fact was quite expected because the PC1
image is not sensible to the spectral content of the data.
In order to quantitatively evaluate the performances of the enhancement
technique in terms of spatial details, in Fig. 6
horizontal profiles across
Bessel and Dawes craters taken, respectively, on the
and
images are shown. Here, we have used
obtained by
means of the PC2 and PC3 images. Note the great increase of spatial
contrast. The two peaks visible in the center-right plots correspond to
the western and eastern rim of the two craters. The technique has
spatially resolved the rims of the Bessel and Dawes craters, not visible
in the raw image. The effect of the technique has been to remove the
surrounding mare contribution from the compositional different craters
rim.
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Figure 5: Enhanced images obtained by means of relation (2). b-c) show more spatial details respect to the raw image shown in Fig. 2 |
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Figure 6:
Profiles across the Bessel and Dawes craters taken on the 0.7
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