[Insight-users] Multi Modality Multi Resolution Doubt : Panoramas, Mosaics, Stitching
Arash Jahangir
arash at vije.ca
Mon, 1 Mar 2004 00:38:26 -0500
Hi Luis,
I'd be honored to be involved on a collaborative effort with members of ITK
users community. I have to first think the requirements through and decide
on the timing before I get involved. I will take you up on this when the I
am ready.
thanks,
Arash
----- Original Message -----
From: "Luis Ibanez" <luis.ibanez at kitware.com>
To: "Arash Jahangir" <arash at vije.ca>
Cc: "ITK" <insight-users at itk.org>
Sent: Sunday, February 29, 2004 10:33 PM
Subject: Re: [Insight-users] Multi Modality Multi Resolution Doubt :
Panoramas, Mosaics, Stitching
>
> Hi Arash,
>
> I'm not aware of public programs for building mosaics via registration.
>
> However you may want to join forces with other ITK users who have
> similar interests. Anybody working on Microscopy and Teledetection
> will benefit from a framework for registering slices as mosaics.
>
> The basic elements for performing this task are already in the toolkit,
> what we should consider adding is a 'manager' class that will take a
> set of images, with a set of pair specifications (e.g. image 15 has a
> common border with image 21...) and then performs iterative refinements
> of registration by computing transforms between pairs. It will be a
class
> with a role similar to the one played by the Multi-Resolution registration
> class.
>
> If you are interested in pursuing a collaboration with other users, we
> will be happy to put an skeleton for this class and let it evolve accoding
> to your needs.
>
>
> Please let us know,
>
>
> Thanks
>
>
> Luis
>
>
>
> --------------------------
> Arash Jahangir wrote:
>
> >Thanks Luis. Do you happen to know of any public programs/examples that
I
> >could look at to get more familiar with the process?
> >
> >TIA,
> >Arash
> >
> >PS Forget Billy Crystal; they should have gotten you to host the show :-)
> >
> >
> >----- Original Message -----
> >From: "Luis Ibanez" <luis.ibanez at kitware.com>
> >To: "Arash Jahangir" <arash at vije.ca>
> >Cc: "ITK" <insight-users at itk.org>
> >Sent: Sunday, February 29, 2004 5:04 PM
> >Subject: Re: [Insight-users] Multi Modality Multi Resolution Doubt
> >
> >
> >
> >
> >>Hi Arash,
> >>
> >>The 20 to 30 degrees that a registration method can correct for
> >>are assumed to be *after* you provide an initialization.
> >>
> >>If you have images with a relative rotations that is larger than
> >>30 degrees, but you can provide an initialization by for example
> >>using landmarks, then the actual rotation that the registration
> >>method has to correct is only the residual rotation error left after
> >>the initialization.
> >>
> >>The problem of reconstructing a panorama is very similar
> >>to the problem of constructing mosaics in teledetection or
> >>stitching images in microscopy. They can be solved with
> >>the current registration framework in ITK.
> >>
> >>You will find usefult to take advantage of the masking
> >>capabilities that have been added to some metrics.
> >>
> >>The extra dificulty in mosaic is that you don't only need
> >>to register two images but a set of N images in subsets.
> >>Therefore you may have to iterate among the pairs of
> >>neighbor images and redistribute the geometric transform
> >>over the entire set of images.
> >>
> >>
> >>Regards,
> >>
> >>
> >> Luis
> >>
> >>
> >>
> >>
> >>----------------------------
> >>Arash Jahangir wrote:
> >>
> >>
> >>
> >>>Hi Luis,
> >>>Would this range of 20-30 degrees be still the limiting factor if I had
> >>>
> >>>
> >some
> >
> >
> >>>user input that could roughly identify matching regions between the
> >>>
> >>>
> >images
> >
> >
> >>>as a starting point? To put this question in perspective, let me
explain
> >>>what I am after.
> >>>
> >>>I have a set of photos that form a "panorama" with some overlap.
Because
> >>>the subject was relatively close to the camera, the rotational
distortion
> >>>
> >>>
> >in
> >
> >
> >>>the overlapping region is quite obvious (as compared to say a panorama
of
> >>>the Rocky Mountains). I am trying to write a program that would merge
> >>>
> >>>
> >all
> >
> >
> >>>these photos with each other. Do you have any suggestions for how I
> >>>
> >>>
> >should
> >
> >
> >>>go about this?
> >>>
> >>>thanks,
> >>>Arash
> >>>
> >>>----- Original Message -----
> >>>From: "Luis Ibanez" <luis.ibanez at kitware.com>
> >>>To: "CSPL" <hyd2_affable at sancharnet.in>
> >>>Cc: <insight-users at itk.org>
> >>>Sent: Saturday, February 28, 2004 10:55 AM
> >>>Subject: Re: [Insight-users] Multi Modality Multi Resolution Doubt
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>>Hi Abdul,
> >>>>
> >>>>A reasonable registration proces will correct for
> >>>>rotations of about 20 to 30 degrees. Expecting
> >>>>it to correct for image orientation (axial, coronal
> >>>>saggital) is unrealistic and actually dangerous.
> >>>>
> >>>>Registration is an optimization problem that is solved
> >>>>with a cost function with multiple extrema. There is
> >>>>no magic here, if you don't initialize the registration
> >>>>close to the optimal region, you can end up anywhere,...
> >>>>and don't have to much right to complain.
> >>>>
> >>>>
> >>>>There are filters in ITK for correcting Flipping and
> >>>>orienting images:
> >>>>
> >>>>
> >>>>
>
>>>http://www.itk.org/Insight/Doxygen/html/classitk_1_1OrientImageFilter.htm
l
> >>>
> >>>
>
>>>>http://www.itk.org/Insight/Doxygen/html/classitk_1_1FlipImageFilter.html
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
>
>>http://www.itk.org/Insight/Doxygen/html/classitk_1_1ReflectImageFilter.htm
l
> >>
> >>
> >>>
> >>>
> >>>>This is something that has to be done very carfully since
> >>>>you could easily switch left-right on the patient image
> >>>>and lead a surgeon to operate on the wrong side.
> >>>>
> >>>>
> >>>>So, to answer your questions explicitly:
> >>>>
> >>>>1) Yes, you must set the orientation to be the same
> >>>>2) No, ITK will not do that for you.
> >>>>3) Yes, you need to supply parameters.
> >>>>
> >>>>
> >>>>
> >>>>Regards,
> >>>>
> >>>>
> >>>> Luis
> >>>>
> >>>>
> >>>>-----------------
> >>>>CSPL wrote:
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>>Hi,
> >>>>>
> >>>>>I need to do some registration of SPECT[brain] with MRI[segmented
> >>>>>brain]. So i have choosen Multi Modality Multi Resolution
Registration
> >>>>>and stuck with some problems. I am not getting the final results upto
> >>>>>the mark. Later i found that my MRI is in Coronal View and the SPECT
is
> >>>>>in Transverse View. I want you to clarify in this point that
> >>>>>
> >>>>>1. Do we need to set the orientation of both the volumes same? or
> >>>>>2. Does ITK will itself look for this and REGISTER? or
> >>>>>3. Do we need to supply any parameters to get REGISTRATION even in
this
> >>>>>situation?
> >>>>>
> >>>>>Please reply.
> >>>>>
> >>>>>Thanks in Advance
> >>>>>S. Abdul Rahim
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>_______________________________________________
> >>>>Insight-users mailing list
> >>>>Insight-users at itk.org
> >>>>http://www.itk.org/mailman/listinfo/insight-users
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>_______________________________________________
> >>>Insight-users mailing list
> >>>Insight-users at itk.org
> >>>http://www.itk.org/mailman/listinfo/insight-users
> >>>
> >>>
> >>>
> >>>
> >>>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >_______________________________________________
> >Insight-users mailing list
> >Insight-users at itk.org
> >http://www.itk.org/mailman/listinfo/insight-users
> >
> >
> >
>
>
>
>
>
>