Figure plots each of the four variants of
the generalised overlap measure, as a function of 79#79, the degree
of misregistration. As expected, the value decreases monotonically
with increasing misregistration, in each case. This shows that our
two gold-standard measures of misregistration (mean pixel
displacement and ground-truth overlap) are in agreement, which
validates the experimental framework.
Similarly, Figures &
plot
Generalisation and Specificity as functions of 79#79, for different
values of shuffle radius 66#66. The results are qualitatively
similar to those obtained for generalised overlap, except that
both measures increase monotonically with increasing
misregistration, as expected (see Section
. These results show that, over the range of
misregistrations investigated, the model-based measures are good
surrogates for 79#79, the mean pixel misregistration. Since the
warps used to introduce controlled misregistration were of very
general form, there is no reason to suppose that this result is dependent on the pattern of misregistration.
99#99
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