function to calculate overlap with labelfield

[jefferis]

Would like either a function or simple examples showing how to calculate overlap with a label field.

Should we be including the VFB label field in e.g. JFRC2, FCWB, T1 and IS2 space?

[jefferis]

Incidentally we could translate overlap from the space of the data collection to JFRC2 space by the use of Jacobian determinants for the bridging registration.

[jefferis]

Probably belongs in nat.templatebrains or even in nat at this point

[jefferis]

At its simplest, this would take a thresholded image and a label field and return a data.frame with counts of each label and its overlap.

[jefferis]

OK I think this should be implemented as nat::cmtk.statistics (translating nat.as::CMTKStatistics) + a function in nat.templatebrains that coordinates thesholding etc.

[jefferis]

So the status of this is that nat now has a nat::cmtk.statistics function as of natverse/nat@8d2d7c6 but the other part of the solution (coordinating the thresholding) is not yet defined or implemented.