[Insight-developers] DifferenceOfGaussiansGradientImageFilter

[Miller, James V (Research)]

> > 3) the calculation does not appear to be a difference of gaussian 
> > gradient calculation
> 
> I'll defer this to George - it's based on his code. As I 
> understand it, 
> this filter approximates a DOG computation when run in tandem 
> with the 
> BinomialBlurImageFilter.
> 
> 

So there are lots of issues with this filter's name then.  At best it computes a gradient of the
image.  However, it is not doing a difference of Gaussians approach internally to the filter.  If you
have to pass it a blurred image, then it is merely doing a gradient calculation.  Now if I am feeding
with a BinomialBlur, then I am not really doing a difference of Gaussians either.


I would say if you can use another gradient calculator in the system, then use that.  I do think it
would be nice to have a DifferenceOfGaussians filter.  It should take a single intensity image and
two sigmas.