How to Get 1D Power Spectra from 2D FFT Image

[maveric_ben]

Dear All,
  Sorry for bothering.
  I had a 2D TEM image and I already used ImageJ to get a 2D power spectra. (FFT transform on the TEM image).
   The problem is: I wan to average the radial intensity distribution of all the direction on the 2D power spectra to get a 1D power spectra. That is to say, how to extract a 1D magnitude of the 2D transform. So, I am wondering is there such a plugin to average over the azimuthal angel to yield the radial power spectra?
   Thanks a lot and your respons will be well appreciated!
  Regards
  Ben

               
---------------------------------
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[Divakar Ramachandran]

Hi Ben,

Try the Radial Profile Plot at the ImageJ plugin page.

HTH,
Divakar


--- Ben <[hidden email]> wrote:

> Dear All,
>   Sorry for bothering.
>   I had a 2D TEM image and I already used ImageJ to get a 2D
> power spectra. (FFT transform on the TEM image).
>    The problem is: I wan to average the radial intensity
> distribution of all the direction on the 2D power spectra to
> get a 1D power spectra. That is to say, how to extract a 1D
> magnitude of the 2D transform. So, I am wondering is there
> such a plugin to average over the azimuthal angel to yield the
> radial power spectra?
>    Thanks a lot and your respons will be well appreciated!
>   Regards
>   Ben
>
>
> ---------------------------------
> Talk is cheap. Use Yahoo! Messenger to make PC-to-Phone calls.
>  Great rates starting at 1&cent;/min.
>

               
__________________________________________________________
Yahoo! India Matrimony: Find your partner now. Go to http://yahoo.shaadi.com

[Dean Waldow Email Lists]

Hi,

You can try the radial profile plugin as Divakar suggests. I also  
ended up rewriting the radial profile plugin so the x-axis is wave  
vector to compare with scattering data. If that is of interest, let  
me know.

Dean Waldow


On Mar 27, 2006, at 7:07 PM, Ben wrote:

> Dear All,
>   Sorry for bothering.
>   I had a 2D TEM image and I already used ImageJ to get a 2D power  
> spectra. (FFT transform on the TEM image).
>    The problem is: I wan to average the radial intensity  
> distribution of all the direction on the 2D power spectra to get a  
> 1D power spectra. That is to say, how to extract a 1D magnitude of  
> the 2D transform. So, I am wondering is there such a plugin to  
> average over the azimuthal angel to yield the radial power spectra?
>    Thanks a lot and your respons will be well appreciated!
>   Regards
>   Ben
>
>
> ---------------------------------
> Talk is cheap. Use Yahoo! Messenger to make PC-to-Phone calls.  
> Great rates starting at 1&cent;/min.

[Andy Gotz-2]

Hi,

I have a jpeg image as an array of bytes which I get from a server via
the network. How can I display this in ImageJ without writing the image
out to a file? I am looking for something like ColorProcessor but with a
jpeg image as input. Is there an api call to do this? Has anyone done
anything similar ?

Thanks for any help you can offer.

Andy

[Gabriel Landini]

On Tuesday 28 March 2006 05:33, Divakar@Yahoo wrote:
> Try the Radial Profile Plot at the ImageJ plugin page.

By any chance, has anybody added the option to display the standard deviation
of the averave profile to the plot?

Thanks,

G.

[Wayne Rasband]

> I have a jpeg image as an array of bytes which I get from a server via
> the network. How can I display this in ImageJ without writing the
> image out to a file? I am looking for something like ColorProcessor
> but with a jpeg image as input. Is there an api call to do this? Has
> anyone done anything similar ?
>
> Thanks for any help you can offer.

Something like this should work:

   Image img = Toolkit.getDefaultToolkit().createImage(bytes);
   new ImagePlus("title", img).show();

-wayne

[maveric_ben]

Thanks a lot Divakar, it works!
Ben

[maveric_ben]

Yes, sure it helps, we want the the x axis is k space. Thanks Dean. Hope I can get your rewrited version.
By the way, is the averaged intensity  in power spectra encoded on a linear scale or logarithmic scale?

Cheers
Ben

[Divakar Ramachandran]

Hi Dean,

X-axis in wave vector units is of interest to me too, since I
use Radial profile almost exclusively on power spectra
calculated from HRTEM images. Please let me know how to do that.

Thanks,
Divakar


--- Dean Waldow <[hidden email]> wrote:

> Hi,
>
> You can try the radial profile plugin as Divakar suggests. I
> also  
> ended up rewriting the radial profile plugin so the x-axis is
> wave  
> vector to compare with scattering data. If that is of
> interest, let  
> me know.
>
> Dean Waldow
>
>
> On Mar 27, 2006, at 7:07 PM, Ben wrote:
>
> > Dear All,
> >   Sorry for bothering.
> >   I had a 2D TEM image and I already used ImageJ to get a 2D
> power  
> > spectra. (FFT transform on the TEM image).
> >    The problem is: I wan to average the radial intensity  
> > distribution of all the direction on the 2D power spectra to
> get a  
> > 1D power spectra. That is to say, how to extract a 1D
> magnitude of  
> > the 2D transform. So, I am wondering is there such a plugin
> to  
> > average over the azimuthal angel to yield the radial power
> spectra?
> >    Thanks a lot and your respons will be well appreciated!
> >   Regards
> >   Ben
> >
> >
> > ---------------------------------
> > Talk is cheap. Use Yahoo! Messenger to make PC-to-Phone
> calls.  
> > Great rates starting at 1&cent;/min.
>

---------------------------------
 Divakar@Yahoo
---------------------------------



               
__________________________________________________________
Yahoo! India Matrimony: Find your partner now. Go to http://yahoo.shaadi.com

[originlab1]

Divakar Ramachandran wrote

Hi Dean,

X-axis in wave vector units is of interest to me too, since I
use Radial profile almost exclusively on power spectra
calculated from HRTEM images. Please let me know how to do that.

Thanks,
Divakar


--- Dean Waldow <[hidden email]> wrote:

> Hi,
>
> You can try the radial profile plugin as Divakar suggests. I
> also  
> ended up rewriting the radial profile plugin so the x-axis is
> wave  
> vector to compare with scattering data. If that is of
> interest, let  
> me know.
>
> Dean Waldow
>
>
> On Mar 27, 2006, at 7:07 PM, Ben wrote:
>
> > Dear All,
> >   Sorry for bothering.
> >   I had a 2D TEM image and I already used ImageJ to get a 2D
> power  
> > spectra. (FFT transform on the TEM image).
> >    The problem is: I wan to average the radial intensity  
> > distribution of all the direction on the 2D power spectra to
> get a  
> > 1D power spectra. That is to say, how to extract a 1D
> magnitude of  
> > the 2D transform. So, I am wondering is there such a plugin
> to  
> > average over the azimuthal angel to yield the radial power
> spectra?
> >    Thanks a lot and your respons will be well appreciated!
> >   Regards
> >   Ben
> >
> >
> > ---------------------------------
> > Talk is cheap. Use Yahoo! Messenger to make PC-to-Phone
> calls.  
> > Great rates starting at 1¢/min.
>



---------------------------------
 Divakar@Yahoo
---------------------------------



               
__________________________________________________________
Yahoo! India Matrimony: Find your partner now. Go to http://yahoo.shaadi.com

Hi Divakar and Dean,
Can any of you please share that plugin? I am laos working with HRTEM images and interested in obtaining the 1D power spectra.
--
AB