[Insight-developers] passing ghost data

[Matthew McCormick (thewtex)]

Hi Andriy,

What type of tensors are these?  How is the solver using them?  What
does the architecture look like?  Is it related to this patch?  Are
there other patches?

http://review.source.kitware.com/#change,2688

Thanks,
Matt

On Mon, Sep 19, 2011 at 5:12 PM, Andriy Kot <andriy.kot at gmail.com> wrote:
>  Greetings,
>
> there is a feature selection filter which selects a fraction of image
> pixels. Block matching filter takes those pixels and computes an
> initial displacement field. The displacement field is then passed to
> solver to compute the final displacement field. Among other things,
> the solver needs tensors for the selected pixels but block matching
> does not.
>
> When this projects was a single black-box application the perfect
> place to compute tensors was at feature selection phase. With the
> application being broken into several components it is not so clear
> anymore.
> Right now the tensors are computed in feature selection filter and
> stored with selected points. Inside block matching filter tensors are
> copied over and stored with the output displacement field.
> While it works, a user is unaware tensors and being computed and
> passed between filters.
>
> I was wondering what people in ITK community would suggest. What would
> be a proper place to compute tensors and how to properly pass it to
> the solver?
>
> Thanks
>
> --
> Andriy
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