Re: [Teem-users] 2D Laplacian

[James B. <bi...@cs...>]

I thought there was a way to apply any kernel to a nrrd.  There is even 
a laplacian kernel defined.

James

Gordon Kindlmann wrote:

> hi,
> 
> On Thursday, July 15, 2004, at 04:09 PM, David Weinstein wrote:
> 
>> If I have a single slice 2D slice of data, and I want to compute the 
>> (2D) Laplacian over it, is there support for this in Teem/gage?  Or do 
>> I have to build a volume that has three copies of that slice?
> 
> 
> There isn't direct support for much in the way of 2D image operations.  
> You can imagine how it could be done as three unu steps (a resample with 
> cubicdd:1,0 in X, a seperate resample in Y, then add them), but using 
> the API for this would be pretty tiresome, and its not efficient.
> 
> Gage will, as you suspect, require multiple slices.  But you should be 
> able to get by with just two slices joined together.  I decided some 
> time ago that gage was going to be 3D specific.
> 
> There is a separate library for 2D image things, called moss, but its 
> not very developed right now.  It can do image resampling and 
> transforms, but it can't compute anything other than the reconstructed 
> value.  With time it will probably turn into a gage for 2D data.
> 
> alas,
> Gordon
> 
> 
> 
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