[Insight-users] gaussian filter example

[ycl lydia]

Dear Luis,
It would be really helpful if you create a variant of the example. This will 
help me in better exploiting and using the GUI for 2D and 3D dsiplys and 
also the templated classes.
Thanks
Lydia


>From: Luis Ibanez <luis.ibanez@kitware.com>
>To: ycl lydia <ycllydia@hotmail.com>
>CC: insight-users@public.kitware.com
>Subject: Re: [Insight-users] gaussian filter example
>Date: Mon, 15 Apr 2002 10:59:29 -0400
>
>
>Lydia,
>
>ITK is N-Dimensional !!
>
>These flexibility has been implemented using
>templates in order to get the performance
>advantage of compile time instantiations.
>
>The GaussianFilter example however was writen
>explicitly for 3D.
>
>As you may have already noticed, the actual ITK
>content of the example should be about 10% while
>the rest of the code is dedicated to User
>Interaction.
>
>Loading a volume with only one slice will not
>behave correctly as a 2D image because the filters
>in the example will still try to smooth it along Z.
>
>The recursive (IIR Infinite Impultional Response)
>filters used for the Gaussians expect to find a
>minimum of 9 pixels along the direction of the
>filtering (because the order of the recursive
>filter is 4 and it is applied first going forward
>along a line and the going backbard).
>
>It should be relatively easy to modify the example
>to make it 2D.  It is mostly removing code  :-)
>and replacing part of the GUI.
>
>To convert the ITK part to 2D you just need to modify
>lines 35 and 36 in liFilterConsoleBase.h
>
>typedef   itk::Image< InputPixelType, 3 >   InputImageType;
>typedef   itk::Image< PixelType, 3 >        ImageType;
>
>replace the "3"'s by "2"'s and you are done !
>
>All the filters are templated over the image type and
>will automatically adjust the dimension at compile time.
>So,... that's the easy part.
>
>The slow part is the GUI, in which the 3D aspect is more
>hard wired. I'll be glad to make these changes and create
>a variant of the example if you are interested in have it.
>
>Just let me know.
>
>
>Thanks
>
>
>Luis
>
>
>==================================================
>
>
>
>
>
>
>
>ycl lydia wrote:
>>Stephen,
>>thanks for your help but
>>I tried with
>>ElementSpacing = 1.48 1.48 1.48
>>and
>>ElementSpacing = 1.48 1.48 1 but it didn't work.
>>
>>Maybe it works only with a volume of slices stored in the same raw file.
>>
>>Lydia
>>
>>>From: "Stephen R. Aylward" <aylward@unc.edu>
>>>To: ycl lydia <ycllydia@hotmail.com>
>>>CC: insight-users@public.kitware.com
>>>Subject: Re: [Insight-users] gaussian filter example
>>>Date: Mon, 15 Apr 2002 09:40:23 -0400
>>>
>>>Hi,
>>>
>>>I think the problem is the 0 in the z-dimension of element spacing.  Try
>>>using
>>>ElementSpacing = 1.48 1.48 1.48
>>>
>>>Also, MetaImage does support 2D images, but you're correct that the
>>>Gaussian filter example won't.
>>>
>>>s
>>>
>>>ycl lydia wrote:
>>>
>>>>Hi,
>>>>When I use the gaussian filter example with the brain web data, it works
>>>>fine.
>>>>I made my own metafile but using just one slice
>>>>This is the file
>>>>NDims = 3
>>>>DimSize = 256 256 1
>>>>ElementType = MET_USHORT
>>>>ElementSpacing = 1.48 1.48 0
>>>>ElementByteOrderMSB = False
>>>>ElementDataFile = mr29.raw
>>>>
>>>>mr29 contains only one mri slice. These are the problems:
>>>>
>>>>1.the image is loaded by the reader but is not displayed as it is. it's
>>>>dark and without thresholding, i can't see waht 's inside
>>>>2. When I execute the filter, I get my screen becoming white.
>>>>Did any one see this problem before?
>>>>thank you for any hints
>>>>Lydia
>>>>
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>>>
>>>
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>>
>>
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