[Insight-developers] Motion estimation itk::DemonsRegistrationFilter

[Luis Ibanez]

Hi Satish,

The DemonsRegistrationFilter will help you detect motion,
*only* if the objects that are moving have an overlap between
two consecutive frames.

(or if you blur them enough for them to become overlapped).

This is the basis of "optical flow" methods.

You may want to look at this presentation:
http://www.na-mic.org/Wiki/images/6/67/Insight-DeformableRegistration-Demons.ppt


So,
the question becomes: are the catheters moving at a speed
that is slow enough for them to have overlapping edges
between two consecutive frames ?

---

If these are catheters that are sliding inside blood vessels,
you may want to rather detect them as tubular artifacts and
track their ending points.

See for example:
http://www.itk.org/ITK/applications/Curve2DExtraction.html


---


About the integration between ITK and OpenCV,

As part of the preparation for ITKv4, we are working
on a software bridge between these two toolkits:

http://www.itk.org/Wiki/ITK_Release_4/A2D2_Projects/Video_Bridge

It should be ready by June, and will be presented
in a tutorial at the upcoming CVPR 2011 conference.


     Luis


------------------------------------------------------------
On Tue, Jan 11, 2011 at 1:39 AM, Satish <Satish at compusol.in> wrote:
> Hi
>
>
>
> We are having to read a multi-frame DICOM from a XA modality (2D),
> containing catheters in motion.
>
> Then we need to detect catheter-tip movement.
>
> Will itk::DemonsRegistrationFilter help in detecting the movement? What are
> the other options?
>
> Is there a way to integrate itk with opencv for the same?
>
>
>
> Regards,
>
> Satish Kumar B.G
>
>
>
> Technical Architect
>
> COMPUSOL
>
>
>
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