for a large scale image with lots of information, a 2d fft should show a
(diffuse) ring of intensity showing the average (inverse) spacing. a line
profile over the diffuse ring might give you something to fit to find the
error on the measurement.
if i open your phase image, then do a 2d fft, then use the colour tool to
optimise the colour range, i find a domain of intensity clustered around the
middle - this (obv) is related only to the low frequency information and the
stuff around the outside is related to the high frequency (to pick the
frequency range you are interested in you can use fft filtering). well, the
lowest frequency stuff i can find in the image is the domain spacing, so i
just pick the frequency that fits the domain of intensity, invert it and i
get an average spacing for your image of about 14 nm. a line profile of the
fft gives me an error of about 1 order of magnitude, so about 1.4 nm.
hth
joe
On 31 August 2011 14:39, Lewis Williams <[email protected]>wrote:
> I was wondering if somebody could help me with the correct/best way to
> process my images.
>
> I'm trying to extract the average domain spacing from tapping mode AFM
> images.
> I have a lamellae structure, and I'd like to know the average
> interdomain spacing.
>
> I can extract a profile and then measure peak to peak and then average
> the values, but this is only averaged in 1 dimension over a chosen profile.
>
> Please advise.
>
> Sincerely,
> Lewis
>
>
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