[Insight-users] [vtkusers] Two questions regarding ITK Gradient Magnitude Recursive Gaussian Image Filter

[Dženan Zukić]

You cannot access intermediate image used in a filter. You would have to
modify the code of the filter in order to visualize the computation process.

In order to figure out the actual formula used, you need to take a look at
the GenerateData method in this file:
ITK4\Modules\Filtering\ImageGradient\include\itkGradientMagnitudeRecursiveGaussianImageFilter.hxx


On Tue, Dec 4, 2012 at 2:00 PM, Xiaopeng Yang <yxp233 at postech.ac.kr> wrote:

> Hello everyone,****
>
> ** **
>
> I have two questions regarding ITK Gradient Magnitude Recursive Gaussian
> Image Filter:****
>
> ** **
>
> **1)    **In this filter, as far as we know, a *finite difference approach
> * is used to calculate gradient magnitude of an image. My question is *what
> formula is used* by the finite difference approach implemented in this
> filter?****
>
> **2)    **The ITK Software Guide tells us that the computation process of
> this filter is equivalent to first *smoothing the image *by convolving it
> with a Gaussian kernel and then applying a differential operator. My
> question is that is there a way to get *an output of the smoothed image*?
> I want to visualize the computation process.****
>
> ** **
>
> If any of you have any idea regarding the two questions, it would be very
> appreciated if you share it with me. Thank you in advance.****
>
> ** **
>
> Best regards,****
>
> Yang****
>
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