|CG PH||[Center of Gravity - Phase approximation ||]|
|SH||[Shift - using bilinear/trilinear interpolation ||]|
[This operation can take three or four optional register variables.
On completion of operation, if these variables are present,
First variable receives: X Center of gravity.
Second variable receives: Y Center of gravity.
With volumes, third variable receives: Z Center of gravity.
With volumes, fourth variable receives: Radius of gyration.
.INPUT FILE: PIC001
[Enter name of image/volume.]
[Only data above this threshold will be used in computation.
The COG determination is very poor with typical high noise particle images windowed from cryo-em micrographs without an appropriate threshold which is hard to determine apriori. Try 'CG PH' for such images but even these alternative central measures may have problems. ]