[Insight-users] Finding intensity range for an image

Mon, 29 Mar 2004 00:44:20 +0100

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Thanks alot

Did a search dont know how I missed that.

On Sun, 2004-03-28 at 16:10 -0500, Bing Jian wrote:

> Google on "itk min max value" will give you following message.
> 
> [Insight-users] Re: Help in identifying the Min and
> max intensity values
> Luis Ibanez luis . ibanez at kitware . com
> Fri, 26 Jul 2002 14:08:35 -0400
> 
> Previous message: [Insight-users] BSpline Interpolation
> Next message: [Insight-users] MRIRegistration example has problems
> Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
> 
> --------------------------------------------------------------------------------
> 
> Hi cspl,
> 
> In order to use the  itkMinimumMaximumImageFilter:
> http://www.itk.org/Insight/Doxygen/html/classitk_1_1MinimumMaximumImageFilter.html
> 
> to compute the lowest and highest intensity values in an
> image you have to call first the "Update()" method of the
> filter.
> 
> The values returned by GetMinimum() and GetMaximum() are
> only valid after calling Update(), before that they are
> just initialized to the numeric min,max values of the
> pixel type.
> 
> 
> You may want to use the alternative "Calculator" class:
> 
> http://www.itk.org/Insight/Doxygen/html/classitk_1_1MinimumMaximumImageCalculator.html
> 
> Which will not act as an image filter. In order to use this Calculator
> class you must call first "Compute()" and then GetMinimum(),
> and/or GetMaximum(). If you are interested in only one of them, you
> can
> use just "ComputeMinimum()" or "ComputeMaximum()" before calling
> GetMinimum(), GetMaximum().
> 
> Hope that helps
> 
>     Luis
> 
> 
> 
> 
> -- 
> Best wishes,
> Bing Jian
> bjian at cise.ufl.edu
> 
> 
> On Sun, 28 Mar 2004, Glenn Pierce wrote:
> 
> > Hi
> >
> > Does anyone know how I can acquire the maximum and mininum intensity
> > values for an image in itk ?
> >
> > Basically this so I can auto scale the intensity range using
> > SetColorWindow and SetColorLevel of vtkImageViewer for each image.
> >
> > Thanks
> >
> >
> > _______________________________________________
> > Insight-users mailing list
> > Insight-users at itk.org
> > http://www.itk.org/mailman/listinfo/insight-users
> >
> >

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Thanks alot<BR>
<BR>
Did a search dont know how I missed that.<BR>
<BR>
<BR>
<BR>
On Sun, 2004-03-28 at 16:10 -0500, Bing Jian wrote:<BR>
<BR>
<BLOCKQUOTE TYPE=CITE>
<PRE><FONT COLOR="#000000">Google on &quot;itk min max value&quot; will give you following message.</FONT>

[Insight-users] Re: Help in identifying the Min and
max intensity values
Luis Ibanez luis . ibanez at kitware . com
Fri, 26 Jul 2002 14:08:35 -0400

<FONT COLOR="#000000">Previous message: [Insight-users] BSpline Interpolation</FONT>
<FONT COLOR="#000000">Next message: [Insight-users] MRIRegistration example has problems</FONT>
<FONT COLOR="#000000">Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]</FONT>

<FONT COLOR="#000000">--------------------------------------------------------------------------------</FONT>

<FONT COLOR="#000000">Hi cspl,</FONT>

<FONT COLOR="#000000">In order to use the  itkMinimumMaximumImageFilter:</FONT>
<A HREF="http://www.itk.org/Insight/Doxygen/html/classitk_1_1MinimumMaximumImageFilter.html">http://www.itk.org/Insight/Doxygen/html/classitk_1_1MinimumMaximumImageFilter.html</A>

<FONT COLOR="#000000">to compute the lowest and highest intensity values in an</FONT>
<FONT COLOR="#000000">image you have to call first the &quot;Update()&quot; method of the</FONT>
<FONT COLOR="#000000">filter.</FONT>

<FONT COLOR="#000000">The values returned by GetMinimum() and GetMaximum() are</FONT>
<FONT COLOR="#000000">only valid after calling Update(), before that they are</FONT>
<FONT COLOR="#000000">just initialized to the numeric min,max values of the</FONT>
<FONT COLOR="#000000">pixel type.</FONT>

<FONT COLOR="#000000">You may want to use the alternative &quot;Calculator&quot; class:</FONT>

<A HREF="http://www.itk.org/Insight/Doxygen/html/classitk_1_1MinimumMaximumImageCalculator.html">http://www.itk.org/Insight/Doxygen/html/classitk_1_1MinimumMaximumImageCalculator.html</A>

Which will not act as an image filter. In order to use this Calculator
class you must call first &quot;Compute()&quot; and then GetMinimum(),
and/or GetMaximum(). If you are interested in only one of them, you
can
use just &quot;ComputeMinimum()&quot; or &quot;ComputeMaximum()&quot; before calling
GetMinimum(), GetMaximum().

<FONT COLOR="#000000">Hope that helps</FONT>

<FONT COLOR="#000000">    Luis</FONT>

<FONT COLOR="#000000">-- </FONT>
<FONT COLOR="#000000">Best wishes,</FONT>
<FONT COLOR="#000000">Bing Jian</FONT>
<A HREF="mailto:bjian at cise.ufl.edu">bjian at cise.ufl.edu</A>

<FONT COLOR="#000000">On Sun, 28 Mar 2004, Glenn Pierce wrote:</FONT>

<FONT COLOR="#000000">&gt; Hi</FONT>
<FONT COLOR="#000000">&gt;</FONT>
<FONT COLOR="#000000">&gt; Does anyone know how I can acquire the maximum and mininum intensity</FONT>
<FONT COLOR="#000000">&gt; values for an image in itk ?</FONT>
<FONT COLOR="#000000">&gt;</FONT>
<FONT COLOR="#000000">&gt; Basically this so I can auto scale the intensity range using</FONT>
<FONT COLOR="#000000">&gt; SetColorWindow and SetColorLevel of vtkImageViewer for each image.</FONT>
<FONT COLOR="#000000">&gt;</FONT>
<FONT COLOR="#000000">&gt; Thanks</FONT>
<FONT COLOR="#000000">&gt;</FONT>
<FONT COLOR="#000000">&gt;</FONT>
<FONT COLOR="#000000">&gt; _______________________________________________</FONT>
<FONT COLOR="#000000">&gt; Insight-users mailing list</FONT>
<FONT COLOR="#000000">&gt; </FONT><A HREF="mailto:Insight-users at itk.org">Insight-users at itk.org</A>
<FONT COLOR="#000000">&gt; </FONT><A HREF="http://www.itk.org/mailman/listinfo/insight-users">http://www.itk.org/mailman/listinfo/insight-users</A>
<FONT COLOR="#000000">&gt;</FONT>
<FONT COLOR="#000000">&gt;</FONT></PRE>
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