Rotating Callipers Macro

[Michael Doube]

Hi All

I've just written (with Gabriel's generous help) a macro to calculate
the diameter (maximum) and width (minimum) of an ROI, as it would be
measured with real callipers.  It's a rough and ready implementation for
ImageJ of the technique described here
http://cgm.cs.mcgill.ca/~orm/rotcal.html

You can check out the code here:
http://doube.org/macros.html#rotcal

It's still fairly beta, and I'm pretty sure that it's not as efficient
as it could be but it does give the correct 'answer'.

Cheers

Mike