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

[Jeremy Lecoeur]

  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 
> <mailto: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
>>     <mailto: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  <tel:%2B1%20615%20343%207798>
>     Fax:+1 615 343 5459  <tel:%2B1%20615%20343%205459>
>
>


-- 
Jeremy Lecoeur, Ph.D.
Research Associate
Vanderbilt University
Phone: +1 615 343 7798
Fax: +1 615 343 5459

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