[Insight-developers] Motion estimation itk::DemonsRegistrationFilter

[Satish Kumar B.G]

Hi

I have managed to use the curves2dextractor as a library in my console-app. Thanks Luis.
It gave us a good start.
Just a question, I see the extractor uses itk::ImageFileReader in order to read and write the DICOM files.
itk::ImageFileReader will only read image data from a single file I guess. But we need to read and process image data
from a single multi-frame DICOM file or series of DICOM files (frame-per-file) in a folder. 
Can we use itk::ImageSeriesReader for this? What will be the impact on the extractor? Do we need to loop through
the image-frames applying the filters on each and then write the series back to a single file? 

Regards
- Satish

-----Original Message-----
From: Luis Ibanez [mailto:luis.ibanez at kitware.com] 
Sent: Tuesday, January 11, 2011 6:05 PM
To: Satish
Cc: insight-developers at itk.org
Subject: Re: [Insight-developers] Motion estimation itk::DemonsRegistrationFilter

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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