Biomedical Engineering Reference
In-Depth Information
930 cm
-1
976 cm
-1
1057 cm
-1
400
400
100
200
200
50
0
0
0
-10
-5
05
-5
0510
-10
-5
0
1142 cm
-1
1215 cm
-1
1377 cm
-1
100
200
200
0
0
0
-2
02468
-10
-5
0
-8-6-4-20 2
1443 cm
-1
1504 cm
-1
1643 cm
-1
200
200
200
100
0
0
0
-10
-5
0
-10
-5
0
-10
-5
0
5
Figure 5.24
Histograms for the second-derivative intensity at the indicated wavelengths. The
x
axis units
are arbitrary.
PC1 scores
PC2 scores
PC3 scores
PC4 scores
Figure 5.25 (See colour insert.)
The second principal component (PC2) provides the same contrast as the difference between
the bands at 1057 and 1215 cm
−1
. The first PC identifies a small region near the centre of the
image.
Search WWH ::
Custom Search