[Insight-users] How to connect itk::VTKImageImport with vtkImageExport

[Thomas - Kuiran Chen]

Hi Luis,

I need to use some preprocessed image data in ITK from my VTK component, and looks like itk::VTKImageImport can do that by connecting the output of VTK::vtkImageExport.

But the man page really doesn't help much to explain how to connect these two together.

Could you please give me some more details or simply, a piece of example/test code (C++)?

Thanks,
Thomas Kuiran Chen



---------------------- Original Message ------------------------
From: Luis Ibanez <luis.ibanez at kitware.com>
To: Wagner Sales <wsalles2003 at yahoo.com.br>
Sent: 2004-04-16 15:29:03
Subject: Re: [Insight-users] Creating 3D images based on slices


Hi Wagner,

If you already have the data in memory, then
the only issue is to perform interpolation.

(Assuming that the slices are actually not
  spaced uniformly)... or are they uniformly
spaced along Z ?

If the space if uniform you don't need any
interpolation...

Otherwise, You may want to look at the BSpline
interpolators in ITK as well as the KernelBase
splines.


    Regards,


       Luis


-------------------
Wagner Sales wrote:

> Hi Luis,
> 
> Luis Ibanez wrote:
> 
>>
>> Hi Wagner,
>>
>> Are your slices being stored in independent files ? 
> 
> 
> Here is the problem... Are not! But I have the data in memory, but I can 
> convert to every format. In last case, pixel by pixel... ;)
> I have the position z-axis position too... Well, if have like do this 
> withou using the serie readers, like in VTK ( vtk have one too ), better 
> to me. But if not have, or are must difficult, 'll change my program... 
> no problem.
> Thks.
> 
>>
>>
>> If so, you can simply use the ImageSeriesImageReader.
>> You will find examples in the directory:
>>
>>        Insight/Examples/IO
>>
>> they are:
>>
>>        DicomSeriesReadImageWrite.cxx
>>        ImageReadImageSeriesWrite.cxx
>>        ImageSeriesReadWrite.cxx
>>        RGBImageSeriesReadWrite.cxx
>>
>>
>>
>> This will create a 3D image with the collection of
>> 2D image from your files.
>>
>> It is still *your* responsibility to setup the Z
>> pixel spacing, since the reader has no other way to
>> figure out this value. (DICOM probably can...).
>>
>> You can use the itkChangeInformationImageFilter for
>> the purpose of setting such pixel spacing.
>>
>> There is no interpolation involved in this process.
>> The 3D image will be just a concatenation of slices.
>>
>>
>> If your slices do not correspond to a uniform
>> sampling along Z.... then.... you are in trouble...  :-/
>>
>> Are they at least parallel  ? ...
>>
>> The brute force approach will be to use KernelSplines
>> in order to interpolate intensity values... that will
>> work... but is not going to be fast.
>>
>>
>>    Regards,
>>
>>
>>       Luis
>>
>>
>>
>> ------------------------
>> Wagner Sales wrote:
>>
>>> Hi,
>>>
>>> First, thank's by the last help. like you all probabily know, I need 
>>> to use a volume in ITK. You told me to use a itkImage with dimension 
>>> = 3. I looked in the examples, and i'm convinced that that's the 
>>> right way to do it. But, now I have a different problem... like I 
>>> said before, I need to fill this 3-dimensional itkImage with n 
>>> 2-dimensional images. So, my current problem is how o put n 
>>> differents images into the 3D image, and, furthermore, how to specify 
>>> the coordinates of the images in the 3D one (the z-axis). After that, 
>>> I need to interpolate the images, because my slices aren't 
>>> contiguous, I was looked how to set the space between the images. Are 
>>> just that? I don't need to specify the interpolation?
>>>
>>> Thanks,
>>>
>>> Wagner
>>>
>>>
>>> _______________________________________________
>>> Insight-users mailing list
>>> Insight-users at itk.org
>>> http://www.itk.org/mailman/listinfo/insight-users
>>>
>>
>>
>>
>> _______________________________________________
>> Insight-users mailing list
>> Insight-users at itk.org
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>>
> 
> 
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