Correction for intensity shift

[Katrin Walther]

Hi all,

My 3D brain images have a slight intensity shift, which I would like to
correct it. Does anyone know a method to do it in ImageJ?

Thanks in advance
Katrin

[M. Nur Heriawan]

Dear list,

I have more than 100 images (2D slices) resulted from
X-ray CT scanning. I would like to show the histogram
of gray value (of original image) only for the object
apart from the background. Because I need the mean
gray value (which represents CT value) of object for
each image.

I could approximate the boundary of object by using
`polygon selections`, but really it takes time and
less accurate. `Wand tool` should be the most
appropriate tool to get the boundary of object, but
unfortunately it does not work in the original image,
except for the thresholding one.

Any advice or suggestion is very welcome.

Thank you.
   

---------------
M. Nur Heriawan
Laboratory of Applied Geoscience and Technology  
Graduate School of Science and Technology
Kumamoto University, JAPAN
http://www.civil.kumamoto-u.ac.jp/tansa


       
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[M. Nur Heriawan]

Dear list,

I have solved the problem by myself. By using
automatic threshold, we could discriminate the object
from the background and then wand tool could be used
to delineate the object. Finally we could get the
histogram of the object only.

Thank to ImageJ!

--- "M. Nur Heriawan" <[hidden email]> wrote:

> less accurate. `Wand tool` should be the most
> appropriate tool to get the boundary of object, but
> unfortunately it does not work in the original
> image,
> except for the thresholding one.


---------------
M. Nur Heriawan
Laboratory of Applied Geoscience and Technology  
Graduate School of Science and Technology
Kumamoto University, JAPAN
http://www.civil.kumamoto-u.ac.jp/tansa


       
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[Michael Doube-2]

Try my macro for working out volume fraction in stacks; it will give a
mean and mode value for the grey level in the thresholded pixels
(http://doube.net/macros.html#vfb). If you want to plot a histogram of
just the thresholded values, that's possible using something like
http://rsb.info.nih.gov/ij/macros/HistogramPlotter.txt

Hope this helps,

Mike

M. Nur Heriawan wrote:

> Dear list,
>
> I have more than 100 images (2D slices) resulted from
> X-ray CT scanning. I would like to show the histogram
> of gray value (of original image) only for the object
> apart from the background. Because I need the mean
> gray value (which represents CT value) of object for
> each image.
>
> I could approximate the boundary of object by using
> `polygon selections`, but really it takes time and
> less accurate. `Wand tool` should be the most
> appropriate tool to get the boundary of object, but
> unfortunately it does not work in the original image,
> except for the thresholding one.
>
> Any advice or suggestion is very welcome.
>
> Thank you.
>    
>
> ---------------
> M. Nur Heriawan
> Laboratory of Applied Geoscience and Technology  
> Graduate School of Science and Technology
> Kumamoto University, JAPAN
> http://www.civil.kumamoto-u.ac.jp/tansa
>
>
>        
> ____________________________________________________________________________________Yahoo! oneSearch: Finally, mobile search
> that gives answers, not web links.
> http://mobile.yahoo.com/mobileweb/onesearch?refer=1ONXIC
>  

--
Michael Doube  BPhil BVSc MRCVS
PhD Student
Dental Institute
Queen Mary, University of London
New Rd
London  E1 1BB
United Kingdom

Phone [phone] ext 2681

[Mario Guarracino]

http://yawi3d.sourceforge.net
Yawi is a wand tool working on gray scale images (8 bit). It also provides a
histogram of the selection.

Mario

> -----Messaggio originale-----
> Da: ImageJ Interest Group [mailto:[hidden email]] Per conto di M. Nur
> Heriawan
> Inviato: Thursday, May 24, 2007 3:19 AM
> A: [hidden email]
> Oggetto: Histogram for CT object
>
> Dear list,
>
> I have more than 100 images (2D slices) resulted from
> X-ray CT scanning. I would like to show the histogram
> of gray value (of original image) only for the object
> apart from the background. Because I need the mean
> gray value (which represents CT value) of object for
> each image.
>
> I could approximate the boundary of object by using
> `polygon selections`, but really it takes time and
> less accurate. `Wand tool` should be the most
> appropriate tool to get the boundary of object, but
> unfortunately it does not work in the original image,
> except for the thresholding one.
>
> Any advice or suggestion is very welcome.
>
> Thank you.
>
>
> ---------------
> M. Nur Heriawan
> Laboratory of Applied Geoscience and Technology
> Graduate School of Science and Technology
> Kumamoto University, JAPAN
> http://www.civil.kumamoto-u.ac.jp/tansa
>
>
>
> __________________________________________________________________________
> __________Yahoo! oneSearch: Finally, mobile search
> that gives answers, not web links.
> http://mobile.yahoo.com/mobileweb/onesearch?refer=1ONXIC

[Erickson, Bradley J., M.D.]

If ct is 16 bit but yawi only supports 8 bit, that may be the problem.
Brad

----- Original Message -----
From: ImageJ Interest Group <[hidden email]>
To: [hidden email] <[hidden email]>
Sent: Thu May 24 04:59:22 2007
Subject: R: Histogram for CT object

http://yawi3d.sourceforge.net
Yawi is a wand tool working on gray scale images (8 bit). It also provides a
histogram of the selection.

Mario

> -----Messaggio originale-----
> Da: ImageJ Interest Group [mailto:[hidden email]] Per conto di M. Nur
> Heriawan
> Inviato: Thursday, May 24, 2007 3:19 AM
> A: [hidden email]
> Oggetto: Histogram for CT object
>
> Dear list,
>
> I have more than 100 images (2D slices) resulted from
> X-ray CT scanning. I would like to show the histogram
> of gray value (of original image) only for the object
> apart from the background. Because I need the mean
> gray value (which represents CT value) of object for
> each image.
>
> I could approximate the boundary of object by using
> `polygon selections`, but really it takes time and
> less accurate. `Wand tool` should be the most
> appropriate tool to get the boundary of object, but
> unfortunately it does not work in the original image,
> except for the thresholding one.
>
> Any advice or suggestion is very welcome.
>
> Thank you.
>
>
> ---------------
> M. Nur Heriawan
> Laboratory of Applied Geoscience and Technology
> Graduate School of Science and Technology
> Kumamoto University, JAPAN
> http://www.civil.kumamoto-u.ac.jp/tansa
>
>
>
> __________________________________________________________________________
> __________Yahoo! oneSearch: Finally, mobile search
> that gives answers, not web links.
> http://mobile.yahoo.com/mobileweb/onesearch?refer=1ONXIC

[Ibai]

Hello! I'm trying to implement the Huffman compression in order to make a
JPEG encoder. Does anyone know if there is any plugin available, or a
implementation of it.

____________________________________________
 
Ibai Iturricha Martinez
 
Grupo PAS (Procesado Avanzado de Señal)
Facultad de Ingenieria –ESIDE
 
Universidad de Deusto
Avda. de las Universidades, 24
48007 Bilbao (Bizkaia)
Tel.: [phone] - Ext.: 2692
Fax: [phone]
e-mail(a): [hidden email]
http://www.pas.deusto.es/