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10
10
9
9
Power spectrum
8
7
6
5
4
Power spectrum
8
7
6
5
4
3
3
2
0 0.1 0.2 0.3 0.4 0.5
Normalized frequency
2
0 0.1 0.2 0.3 0.4 0.5
Normalized frequency
10
10
9
9
Power spectrum
8
7
6
5
4
Power spectrum
8
7
6
5
4
3
3
2
0 0.1 0.2 0.3 0.4 0.5
Normalized frequency
2
0 0.1 0.2 0.3 0.4 0.5
Normalized frequency
10
10
9
9
Power spectrum
8
7
6
5
4
Power spectrum
8
7
6
5
4
3
3
2
0 0.1 0.2 0.3 0.4 0.5
Normalized frequency
2
0 0.1 0.2 0.3 0.4 0.5
Normalized frequency
Figure 3.20 – Ensemble averaged power spectrums downn the columns for (TL) Original
image (TR) Moment matching (CL) Histogram matching (CR) IFOV method (BL)
Frequency filtering (BR) Wavelet thresholding.