[vtkusers] 3D image convolution with Kernel 20x20x20

[Martin Dulovits]

On 4/2/2012 9:32 PM, David Gobbi wrote:
> On Mon, Apr 2, 2012 at 1:12 PM, Martin Dulovits
> <martin.dulovits at woogieworks.at>  wrote:
>> On 4/2/2012 8:56 PM, David Gobbi wrote:
>>> Hi Martin,
>>>
>>> I think the 7x7x7 restriction is still in place.  Would it be possible
>>> for you to use vtkSeparableConvolution instead?  It has no restriction
>>> on its kernel size.
>>>
>>> You can also look at vtkImageCorrelation.
>> Its the dosimetric distribution of a radiation source. Its symetric, even
>> circular symmetric, but does this mean it is seperable ?
>> Is this 7x7x7 constraint also in ITK ?
> The 7x7x7 constraint is only in that one VTK class.
>
> Circular symmetry is separable for a Gaussian kernel, but not for other kernels.
>
>   - David

Thats was what I remembered from my math courses, but I wasnt sure any 
more ..
I guess then I will try to work in in fourier with vtk or scipy ..
Do you know is there some sample code for convolution with fft in vtk to 
build upon ?

thx a lot again

martin
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