[Insight-users] Image derivative

[Luis Ibanez]

Hi Moti,

You could use the RecursiveGaussianImageFilter
http://www.itk.org/Insight/Doxygen/html/classitk_1_1RecursiveGaussianImageFilter.html

in order to compute derivates along a specific direction.

You will find this filter described in the ITK Software Guide

    http://www.itk.org/ItkSoftwareGuide.pdf

Note that this filter doesn't use central differences, but
IIR filters.  Central differences is a poor method for computing
derivatives because it focuses on transitions 1-pixel wide, which
make them very susceptible to noise in the image.


Of couse,  you can also fine tune your own derivative operator
as it is explained in the ITK Software Guide, in the Iterators
chapter.


    Regards,



       Luis


-----------------------
Moti Freiman wrote:
> Hello,
> This may be a stupid question, but i want to be sure:
> I need to compute image derivative in some axis, lets say the x axis. i 
> want to compute the derivative by using the central differences scheme 
> (*not* sobel or iir or other methods).
> Is there in ITK a prepared filtre which do this, or  should i use the 
> neighbourhood iterators to compute it by myself?
> Thanks,
> Moti Freiman
> 
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