Posted by
Gluender-2 on
Apr 04, 2009; 11:58am
URL: http://imagej.273.s1.nabble.com/1D-autocorrelation-function-tp3692494p3692495.html
Larry,
without reading the papers (not my job)...
Could you please explain what happens with the second coordinate of
an image during the 1-D autocorrelation? Is the image projected in
one direction or is the desired result a series of 1-D
autocorrelation functions?
As far as I know imagej does'nt provide neither 1-D
Fourier-transformation nor 1-D autocorrelation which in general is
computed by Fourier-retransformation of the power spectrum.
However there are numerous applications for data/signal analyses that
allow the computation of both, autocorrelation and power spectrum of
1-D signals. Hence you may export the 1-D data from imagej to one of
these applications and then perform the desired computations.
>Hi
> I am looking for a plug-in for ImageJ that will calculate the 1-D
>autocorrelation function from a binary image.
>
>As per
>
>Journal of Petroleum Science and Engineering 16 (1996) 251-261
>Statistical analysis of the porous microstructure as a method for
>estimating reservoir permeability
>M.A. Ioannidis, M.J. Kwiecien, I. Chatzis
>
>A fourier transform of this curve will then be used to extend my neutron
>scattering data to
>Lower Q values as per
Because the Fourier transform of the autocorrelation function is the
power spectrum, I don't quite grasp why the latter isn't directly
computed, but I think I'm missing some essential information that you
may perhaps kindly provide.
>Radlinski et al. (2004) Angstron-to-millimeter characterization of
>sedimentary rock microstructure.
>J Colloid and Interface Sci. 247, 607-612.
>
>Can anyone suggest what the correct plug-in might be ?
>Thanks.
>
>--Larry
>--
>Dr. Lawrence M. Anovitz
>MS 6110 PO Box 2008
>Aqueous and Geochemistry Group
>Oak Ridge National Laboratory
>Oak Ridge, Tennessee 37831-6110
>
>865-574-5034 : phone
>865-574-4961 : fax
>
>
[hidden email]
HTH
--
Herbie
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