[Insight-developers] Motion estimation itk::DemonsRegistrationFilter

[Satish Kumar B.G]

Thanks luis, that's working.
How do we grab individual frames if we have to apply filters (say itkRecursiveGaussianImageFilter) to each frame before writing them back as a single file?
Is this the right approach while dealing with multi-frame DICOM files.
Regards
- Satish

-----Original Message-----
From: Luis Ibanez [mailto:luis.ibanez at kitware.com] 
Sent: Tuesday, January 18, 2011 8:54 PM
To: Satish Kumar B.G
Cc: insight-developers at itk.org
Subject: Re: [Insight-developers] Motion estimation itk::DemonsRegistrationFilter

HI Satish,

If you have a multi-frame DICOM image in a single file,
you can read it directly with the ImageFileReader as a
3D volume.


You don't need to use the ImageSeriesReader.


We exercise that funcionality regularly in IGSTK.

Use the ImageSeriesReader only if you have a
collection of individual files, each one containing
a 2D slice out of a 3D dataset.

You will find examples in the ITK Software Guide

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



    Luis


----------------------------------------------------------------
On Thu, Jan 13, 2011 at 8:31 AM, Satish Kumar B.G <satish at compusol.in> wrote:
> 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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