Biomedical Engineering Reference
In-Depth Information
Reference
Test
alpha=0.5
alpha=0.9
alpha=1.3
alpha=2.5
Figure 9.6: The reference (top left) and test (top right) images. The test image
warped by landmark warping for
α
=
0
.
5 (middle left),
α
=
0
.
9 (middle right),
α
=
1
.
3 (bottom left), and
α
=
2
.
5 (bottom right). The landmark positions are
marked with white squares and were identical in all cases.
When a sufficient number of test images and landmarks are available, a suit-
able
α
for a given application can be determined by the
leave-one-out
technique:
One or several landmarks are not taken into consideration when calculating the
correspondence function. Their real position is then compared to their position
predicted by the interpolation. Finally, the
α
yielding the smallest average error
