[vtkusers] grey values from CT scan

[Mathieu Malaterre]

Viral,

	According to the doc:

http://www.vtk.org/doc/nightly/html/classvtkImageData.html#z340_0

  float vtkImageData::GetScalarComponentAsFloat  	(   	
		int   	  x,
		int  	  y,
		int  	  z,
		int  	  component
	)

So for accessing pixel (10, 20, 30) you should type:

GetScalarComponentAsFloat(10, 20, 30, 0)

HTH
mathieu
Ps: I assume your image doesn't have more than one component (such as a 
gradient image).


Viral Thakkar wrote:
> Dear Mathieu,
> Thanks. That is what I wanted. But can you please tell me code for C++. 
> what are the parameters for function 
> GetScalarComponentAsFloat(0?,0?,0?,0?) ?
> Thanks again
> Viral
> 
> */Mathieu Malaterre <Mathieu.Malaterre at creatis.insa-lyon.fr>/* wrote:
> 
>     Viral,
> 
>     Here is a python code:
> 
>     reader = vtkVolume16Reader()
>     ...
>     reader.Update()
>     print reader.GetOutput().GetScalarRange()
>     #print pixel value:
>     print reader.GetOutput().GetScalarComponentAsFloat(0,0,0,0)
> 
>     HTH
>     mathieu
>     Ps: I am not sure I understood what you meant by 'threshold value' ???
>     Therefore I translated it to scalar range...
> 
> 
>     Viral Thakkar wrote:
>      > Hi,
>      >
>      > I want to read the greyscale values of the pixels of CT scan. I
>     am using
>      > vtkVolume16Reader to read the CT scans. Can anyone help me
>     regarding how
>      > to get the threshold or greyscale values.
>      >
>      > Thanks
>      >
>      > Viral
> 
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-- 
Mathieu Malaterre
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