[Insight-users] Gaussian of masked images

[Luis Ibanez]

Hi Kai,

If you are using large Gaussians you will find more
efficient to use the LaplacianRecursiveGaussian filter

http://www.itk.org/Insight/Doxygen/html/classitk_1_1LaplacianRecursiveGaussianImageFilter.html

This filter internally uses IIR filters and therefore
its computation time is independent of the size of your
sigma.

You will find examples on the use of this filter in the
files


   Insight/Examples/Filtering/
        LaplacianRecursiveGaussianImageFilter1.cxx
        LaplacianRecursiveGaussianImageFilter2.cxx
        ScaleSpaceGenerator2D.cxx




   Regards,


     Luis



-------------
Kai Li wrote:

> Hi,
>   I'm in a situation where Laplacian of Gaussian(LoG) of masked images has
> to be computed. I'm wondering if ITK has already provided something to
> archieve this.
> 
>   The method that I can come up with at this point is to use a
> Difference-Of-Gaussian operator that can compute the Gaussian derivatives
> for each pixel and mask the kernel of the operator dynamically for each pixel.
> This method seems OK but not efficient for the computation in large
> scale(sigma).
> 
>   Any suggestion is highly appreciated.
> 
> Kai
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