[Insight-users] how to decide parameters

[Luis Ibanez]

Hi Adithya,

Please read the ITK Software Guide

    http://www.itk.org/ItkSoftwareGuide.pdf

in particular, you must read

    Section 9.1.1. "Connected Threshold"

in pdf-pages 536-539.

The numbers:


    Seed X = 60
    Seed Y = 116


are the (x,y) index coordinates of a pixel
inside the region that you want to segment.

As illustrated in Table 9.1 in pdf-page 538,
this seed point is inside white matter in
the case of the input image file:

Insight/Examples/Data/BrainProtonDensitySlice.png


The numbers:

      Lower  threshold 150
      Uppper threshold 180

define the range of intensities of the white
matter in this particular dataset. That is,
we want to capture all pixesl whose intensities
are between 150 and 180.


In order to apply this example to your images,
you must:


    A) Use a visualization tool for locating
       the index coordinates of one pixel
       inside of  the region that you want
       to segment.

    B) Use a visualization tool for measuring
       the range of intensity values of the
       anatomical structure that you want to
       extract.


   Regards,


       Luis


-----------------------
adithya acharya wrote:
> hi
> In connected threshold image filter how do we set the 7 parameters i.e 
> exe file, input image,
> output image, seedX,  seedY, lower threshold, upperthreshold...........??
> in the .cxx file they have given examples
> seedX- 60
> seedY-112
> lower threshold-150
> upper threshold-180
> 
> pls help me how to decide these numbers......??
> how did they decide 60, 112, 150, 180..................??
> 
> 
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