Hi,
Thanks for the help. But I'm still not entirely clear about the what the
calibration module is actually meant for, if not for drift correction.
I tried using an image of a square grating and cropped out one square for
using as the detail image. The problem at the moment is that in calibration
-> get simple error map, the moment the detail and grating images are
selected, the program segfaults and crashes. This is happening with version
2.30 on both windows and linux.
Regards,
Sameer
On 2 December 2012 13:08, Petr Klapetek <[email protected]> wrote:
>
> Dear Sameer,
>
> the detail image in simple error map module should be typically one
> "hole" in the grating.
> In fact it only does correlation search, then finds local maxima in
> correlation and tries
> to fit them on ideal positions of holes. In principle this could be used
> for drift
> correction as well, but some questions would remain, e.g. how to
> extrapolate the
> values of correction coefficients if you want use it for the same
> datafield.
>
> Best regards,
>
> Petr
>
>
> On 12/02/2012 05:26 AM, Sameer Grover wrote:
> > I'm getting a fair amount of drift with my AFM piezo.
> >
> > I would like to image a square grating, calculate the distortion in
> > that image and then apply the results to other scans. Is this possible
> > to do this with gwyddion?
> >
> > I have been trying to figure out how to use the calibration module but
> > haven't been successful so far. In calibration->create simple error
> > map, I have to specify the grating and detail. What exactly is the
> > detail image?
> >
> > I'd appreciate any help
> >
> > Thank you.
> >
> > Regards,
> > Sameer
> >
> >
> > --
> > Sameer Grover
> > Tata Institute of Fundamental Research
> >
> >
> >
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