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Alternatives

There are more than a single alternative to be looked at and many different aspects call for attention as the earlier parts explain. Here is a short summary that may help guide future endeavours:

1. Speed-up: The methods operate very slowly for most globally-driven approaches. A solution to this is desirable because not only would it stimulate more experiments and experiment feedback, but it would also make these methods usable and marketable.
2. Data extension: The simple existing bump which is generated in MATLAB needs to be extended, possibly by conversion to a smoother bump as the one described in the research of Davies and Taylor.
3. Lambda: Lambda coefficient in the objective function weighs appearance against shape and its value is subjective to the problem. Experiments can find alternative solutions or better assignments for lambda.
4. Automation: It would be desirable to create a (compilable) system that copes with the full cycle of analysis without outside intervention and without any pre-existent data annotation.
5. Generalisation: Many ad-hoc algorithms are currently used for group-wise registration. An more impressive system would deal with arbitrary data without compromise to the quality of the results.