diameter automatic calculation

[Marco Ballestri]

I'm interesting to determinate the diameters of nanoparticles
obtained by SEM, do you know how is possible make it
automatically or is it possible to use a macro for this?
thanks a lot for your attention,  Marco Ballestri

--

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    Marco Ballestri              http://www.isof.cnr.it/

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[Joachim Wesner]

Hi there,

I´m planning to write a ImageJ plugin for fringe processing (of
interferometric data etc.) based on the so-called "spatial carrier phase
measurement" method. As I´m pretty new to ImageJ and because the algorithm
in one step requires a fully complex inverse FFT, I have been looking
carefully at the existing FFT and FHT code (I will need to split that
complex FFT in two appropritate FHTs).

However, I am wondering about some strange issues in the FFT class:

As I understand, this class is meant to be both a Plugin to be used for the
current image(s) ("manually", or from a macro), but also exports some
public methods for more general usage.

I´m wondering why does doForewardTransform (and also the private
doInverseTransform) require an FHT object AND an image processor object ip?
Everything about the current image should already be available through he
FHT object, or no?

Even more, the argument ip seems not to be referenced at all in the code
for both methods, but instead, IMHO incorrectly, a reference to a private
Imageplus imp is used. This works as long as the class is only used as a
plugin, but if you call the public method from another place, the old (if
it even already exists?!) imp from the last "manual" call of the plugin
will be referenced. Am I missing something here?


BTW, ImageJ does not yet seem to have any plugin for (2-dimensional) phase
unwrapping - OR? I could not find one, so I will add that too.


Sincerely

Joachim Wesner


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[Robert Dougherty]

Jochim,

One way to deal with FHTs in ImageJ plugins is illustrated in FHT 3D.  My
solution was to hack some source code from ImageJ.  Not very OO, but
effective.  It does seem like it might be useful if FHT.rc2DFHT and
FHT.dfht3 were available as public static methods.

Bob

Robert P. Dougherty, Ph.D.
President, OptiNav, Inc.
Phone [phone]
Fax [phone]
www.optinav.com

 

> -----Original Message-----
> From: ImageJ Interest Group [mailto:[hidden email]] On Behalf Of
> Joachim Wesner
> Sent: Thursday, March 16, 2006 8:59 AM
> To: [hidden email]
> Subject: "Unclean code" in FFT class
>
> Hi there,
>
> I´m planning to write a ImageJ plugin for fringe processing (of
> interferometric data etc.) based on the so-called "spatial carrier phase
> measurement" method. As I´m pretty new to ImageJ and because the algorithm
> in one step requires a fully complex inverse FFT, I have been looking
> carefully at the existing FFT and FHT code (I will need to split that
> complex FFT in two appropritate FHTs).
>
> However, I am wondering about some strange issues in the FFT class:
>
> As I understand, this class is meant to be both a Plugin to be used for
> the
> current image(s) ("manually", or from a macro), but also exports some
> public methods for more general usage.
>
> I´m wondering why does doForewardTransform (and also the private
> doInverseTransform) require an FHT object AND an image processor object
> ip?
> Everything about the current image should already be available through he
> FHT object, or no?
>
> Even more, the argument ip seems not to be referenced at all in the code
> for both methods, but instead, IMHO incorrectly, a reference to a private
> Imageplus imp is used. This works as long as the class is only used as a
> plugin, but if you call the public method from another place, the old (if
> it even already exists?!) imp from the last "manual" call of the plugin
> will be referenced. Am I missing something here?
>
>
> BTW, ImageJ does not yet seem to have any plugin for (2-dimensional) phase
> unwrapping - OR? I could not find one, so I will add that too.
>
>
> Sincerely
>
> Joachim Wesner
>
>
> ______________________________________________________________________
> This email has been scanned by the MessageLabs Email Security System.
> For more information please visit http://www.messagelabs.com/email
> ______________________________________________________________________

[Joachim Wesner]

Bob,

I think you are right.

As I'm still mostly a "procedural" programmer and not an OO one, it seems
best/fastest to me for getting to a working version of a more complex
plugin: Extract the needed FHT routines (that directly work with arrays
etc.) from the sources and base the plugin on that code, instead of
immediately dealing with image processors whose intermediate images won´t
be displayed anyhow!

Later one could cleanup the code and convert it to use straight IPs and
FHTs.

Joachim





                                                                                                                                       
                      Robert Dougherty                                                                                                
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                      16.03.2006 19:23                                                                                                
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Jochim,

One way to deal with FHTs in ImageJ plugins is illustrated in FHT 3D.  My
solution was to hack some source code from ImageJ.  Not very OO, but
effective.  It does seem like it might be useful if FHT.rc2DFHT and
FHT.dfht3 were available as public static methods.

Bob

Robert P. Dougherty, Ph.D.
President, OptiNav, Inc.
Phone [phone]
Fax [phone]
www.optinav.com


 ______________________________________________________________________



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