[Insight-users] 3D image sub-volume and transform matrix

[Dženan Zukić]

I spent a few hours at least trying to get it right. You can also look
through these discussions:
http://vtk.1045678.n5.nabble.com/Announcement-New-image-rendering-classes-for-VTK-td4526574.html
http://vtk.1045678.n5.nabble.com/Question-for-relationship-between-ITK-and-VTK-coordination-system-td3350578.html#a3354743
and the older version of the example:
http://vtk.1045678.n5.nabble.com/Convert-ITK-image-to-VTK-volume-keeping-proper-orientation-and-position-td4553107.html

2011/11/15 Jeremy Lecoeur <jeremy.lecoeur at vanderbilt.edu>

> **
> I already tried that. Results are different but still not correct...
>
>
> On 15/11/2011 10:20, Dženan Zukić wrote:
>
> The order in which you apply rotation and translation is important. Try
> the opposite of what you are doing right now.
>
> 2011/11/15 Jeremy Lecoeur <jeremy.lecoeur at vanderbilt.edu>
>
>>  So, if I got this right, my translation should be the difference (in mm)
>> between the 1st voxel of each image and my rotation should be based on the
>> three Euler angles.
>> When I do that, the orientation looks good but not the the translation.
>> Is there a trick related to the fact that the two images have different
>> resolutions.
>> Small volume is 0.0683 x 0.0683 x 0.5 mm and big volume is 0.5 x 0.5 x
>> 0.5 mm.
>>
>> Jeremy
>>
>>
>> On 11/11/2011 02:39, Dženan Zukić wrote:
>>
>> Maybe this example will help:
>>
>> http://www.vtk.org/Wiki/VTK/Examples/Cxx/VolumeRendering/itkVtkImageConvert
>>
>>
>> On Thu, Nov 10, 2011 at 21:28, Jeremy Lecoeur <
>> jeremy.lecoeur at vanderbilt.edu> wrote:
>>
>>>
>>>
>>> Hello,
>>>
>>> I have two 3D images, one is a sub-volume of the other but is not in the
>>> same orientation.
>>> For the big image, I know its size and also the coordinates in mm of its
>>> first voxel with respect to a frame of reference.
>>> For the small image, I know its size, the coordinates in mm of its first
>>> voxel with respect to the same frame of reference and also the 3 euler
>>> angles (phi, theta, psi) that defines its orientation.
>>> With that, how can I compute the transformation matrix that will allow
>>> me to see the small image in the big image, at the right place? I know
>>> it's supposed to be fairly simple but I cannot figure it out.
>>>
>>> Jeremy
>>>
>>> --
>>> Jeremy Lecoeur, Ph.D.
>>>
>>>
>>>
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>>
>>
>>
>>   --
>> Jeremy Lecoeur, Ph.D.
>> Research Associate
>> Vanderbilt University
>> Phone: +1 615 343 7798
>> Fax: +1 615 343 5459
>>
>>
>
>
> --
> Jeremy Lecoeur, Ph.D.
> Research Associate
> Vanderbilt University
> Phone: +1 615 343 7798
> Fax: +1 615 343 5459
>
>
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