Alpha composition functions of ImageJ Z-projections

[alo200]

Hi ImageJ'ers,

Does anyone know which general alpha composition (Duff-Porter?) functions ImageJ uses to make its Z-projections?

I want to perform the same Z-projection functions using ImageMagick code rather than an ImageJ macro.  For example, what would be the equivalent composition method in Imagemagick for a maximum Z-projection?  Average Z-projection?  Etc...  

I'd like to know all the equivalents of the ImageJ projection methods (Avg. intensity, Max, Min, Sum, Stdev, Median) if anyone knows.

Sincerely,
Adam Oberstein
Department of Molecular Biology
Princeton University

[Gabriel Landini]

On Friday 23 October 2009 19:17:15 alo200 wrote:
> Does anyone know which general alpha composition (Duff-Porter?) functions
> ImageJ uses to make its Z-projections?

My understanding it that IJ computes the statistics that the names imply,
rather than doing alpha composition.

G.

[alo200]

I just want to sure I'm understanding what is going on here.  I'm new to image processing.

By "computing statistics" do you mean reading pixel intensity values of pixel x,y for each image slice, performing the math and then rendering a new image?  For example, would a maximum projection simply take the maximum pixel values of x,y of all the z sections and then use those to render the projection?  

Thanks,
Adam

Gabriel Landini wrote

On Friday 23 October 2009 19:17:15 alo200 wrote:
> Does anyone know which general alpha composition (Duff-Porter?) functions
> ImageJ uses to make its Z-projections?

My understanding it that IJ computes the statistics that the names imply,
rather than doing alpha composition.

G.

[Gabriel Landini]

On Friday 23 October 2009 21:17:33 alo200 wrote:
> By "computing statistics" do you mean reading pixel intensity values of
> pixel x,y for each image slice, performing the math and then rendering a
>  new image?  For example, would a maximum projection simply take the
>  maximum pixel values of x,y of all the z sections and then use those to
>  render the projection?

Yes, that is right.
Regards

G.

[Gabriele Umbriaco]

Dear all,
I search a lot of plugin for measure fringes on Twymann-Green
interferometry, on optical test, contrast measeurements, etc.
Thanks.

Gabriele

[Joachim Wesner]

Hi Gabrielle,

(you should better not use reply to in a forum as this one, if you ask
everbody, you should also make all replies available to everybody!)

I have been working on some ImageJ plugins for wavefront analysis and
related stuff, including different phase shifting based tools, Zernike
fitting,
static fringe analysis based on FT, 2 dimensional phase unwrapping, etc.
there was/is also an old website of mine, that unfortunatelly in the moment
is totally
outdated.

What exactly is your application? Fringe density? Any closed fringes?

For more details you can also contact me directly by PM!

Mit freundlichen Grüßen / Best regards

Joachim Wesner


Leica Microsystems CMS GmbH | GmbH mit Sitz in Wetzlar | Amtsgericht
Wetzlar  HRB 2432
Geschäftsführer:  Dr. Stefan Traeger | Dr. Wolf-Otto Reuter | Dr. David Roy
Martyr | Colin Davis
www.leica-microsystems.com


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[TatiaraLRS]

I'm working with wavefront analysis and I'm new to ImageJ. I read that you worked with Zernike Moments. Please, which Zernike plugin did you use for processing digital image by ImageJ?