[Gwyddion-users] "calculate 1D statistical functions" on masked regions?

[luis vazquez]

Hi,

I am interested in performing on a masked image some analysis by using
the "calculate 1D statistical functions" tool (for instance ACF). I want
to do it only on the masked regions. In principle, it seems that the
tool allows it as at the left bottom of the window appears the "Masking
Mode" section in which one can choose to exclude/include the masked
regions or use the entire image. However, this option appears always as
inactive and it is not possible to do these choices. In contrast, this
is not the case for the "Statistical quantities" tool where it works
without problems. So, does this option really work (and how) in the
"calculate 1D statistical functions" tool?

Thanks in advance,

regards,

Luis

[David Nečas (Yeti)]

Post by luis vazquez
I am interested in performing on a masked image some analysis by using
the "calculate 1D statistical functions" tool (for instance ACF). I want
to do it only on the masked regions. In principle, it seems that the
tool allows it as at the left bottom of the window appears the "Masking
Mode" section in which one can choose to exclude/include the masked
regions or use the entire image. However, this option appears always as
inactive and it is not possible to do these choices.

The option is available only for some quantities for which it is
actually implemented. Which currently means the height distribution.

It is possible to calculate the ACF and other related quantities for
arbitrary regions (http://dx.doi.org/10.1016/j.ultramic.2012.08.002) but
I have only ever implemented it separately using FFTW. There is no
implementation in Gwyddion (yet).

Regards,

Yeti