[Insight-users] transfer functions..

[Luis Ibanez]

Hi Kalphathi,

ITK doesn't have the built-in notion of transfer functions.

This is mostly a visualization concept. You could however easily
implement such functionalities by using the itk::UnaryFunctorFilter
in the case of the pure intensity color mapping, and by using the
itk::BinaryFunctionImageFilter for the combined intensity & gradient
color mapping.

You may find interesting to look at the use of this filter in the
WatershedSegmentation1.cxx example in

         Insight/Examples/Segmentation/
                 WatershedSegmentation1.cxx


You could also combine a set of RecursiveGradientImageFilter
in order to feed a multi-input functor image filter.

ImageAdaptors are also a good option for implementing transfer
fuctions, in particular if you are concerned about memory consumption.


For a discussion on the use of ImageAdaptors, you may want to look
at the SoftwareGuide

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

Chapter 12, pdf-page 521.



    Regards,



        Luis




---------------
Kalpathi R Subramanian wrote:

> Folks:
> 
> Beyond just linear color mapping of data values, are there any other
> transfer function
> capability in VTK or ITK?  In particular, are there any implementations
> of Kindleman's multi-dimensional transfer functions (using directional
> derivatives)?
> 
> Thanks.
> 
>     == krs
> 
> 
> 
> 
> --
> K.R.Subramanian                        Phone: (704) 687-4872
> Department of Computer Science         FAX:   (704) 687-4893
> UNC Charlotte, CARC 311                Email: krs at uncc.edu
> Charlotte, NC 28223-0001               Web: http://www.cs.uncc.edu/~krs
> 
> 
> 
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