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A few improvements to the registration algorithms were inspired by improvements antecedently made to the landmark selection algorithm. At times even some existing code was used to give ideas of how to improve registration, fix bugs and compensate for clutter.
One such example is the rollback for parameterisations which cause evaluation to exacerbate. The optimiser has a nature of returning an even greater value once bad warps have been picked. This needs to be fixed manually, by making some decisions outside the main optimisation routine.