Finally, mathematical modeling methods can be used extract objects. For
example, Gaussian Markov random fields can be used to segment nuclei by
modeling the local dependencies of the nuclei within predefined neighborhoods
[91, 92].
Overall, several different approaches have been developed for 3-D segmen-
tation, and the most popular approaches have combined region-based, edge-
based, and morphological methods to achieve the desired results. The general
consensus is that most applications require a customized set of specific segmen-
tation algorithms and that most images require tuned parameters for optimal
results.
14.13 Comparing Three-
Dimensional Images
In some applications it is necessary to determine the similarity between two
images or to find the