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    I already tried that. Results are different but still not correct...<br>
    <br>
    On 15/11/2011 10:20, Dženan Zukić wrote:
    <blockquote
cite="mid:CAPf2UMSr168tbMsh4p9QLSsk-sdDDiB2FCrdn==cQK2STSSSpw@mail.gmail.com"
      type="cite"><font size="2"><font face="verdana,sans-serif">The
          order in which you apply rotation and translation is
          important. Try the opposite of what you are doing right now.<br>
        </font></font><br>
      <div class="gmail_quote">2011/11/15 Jeremy Lecoeur <span
          dir="ltr">&lt;<a moz-do-not-send="true"
            href="mailto:jeremy.lecoeur@vanderbilt.edu">jeremy.lecoeur@vanderbilt.edu</a>&gt;</span><br>
        <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
          0.8ex; border-left: 1px solid rgb(204, 204, 204);
          padding-left: 1ex;">
          <div bgcolor="#ffffff" text="#000000"> 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. <br>
            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.<br>
            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.<br>
            <br>
            Jeremy
            <div>
              <div class="h5"><br>
                <br>
                On 11/11/2011 02:39, Dženan Zukić wrote:
                <blockquote type="cite"><font size="2"><font
                      face="verdana,sans-serif">Maybe this example will
                      help:<br>
                      <a moz-do-not-send="true"
href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/VolumeRendering/itkVtkImageConvert"
                        target="_blank">http://www.vtk.org/Wiki/VTK/Examples/Cxx/VolumeRendering/itkVtkImageConvert</a><br>
                      <br>
                    </font></font><br>
                  <div class="gmail_quote">On Thu, Nov 10, 2011 at
                    21:28, Jeremy Lecoeur <span dir="ltr">&lt;<a
                        moz-do-not-send="true"
                        href="mailto:jeremy.lecoeur@vanderbilt.edu"
                        target="_blank">jeremy.lecoeur@vanderbilt.edu</a>&gt;</span>
                    wrote:<br>
                    <blockquote class="gmail_quote" style="margin: 0pt
                      0pt 0pt 0.8ex; border-left: 1px solid rgb(204,
                      204, 204); padding-left: 1ex;"> <br>
                      <br>
                      Hello,<br>
                      <br>
                      I have two 3D images, one is a sub-volume of the
                      other but is not in the<br>
                      same orientation.<br>
                      For the big image, I know its size and also the
                      coordinates in mm of its<br>
                      first voxel with respect to a frame of reference.<br>
                      For the small image, I know its size, the
                      coordinates in mm of its first<br>
                      voxel with respect to the same frame of reference
                      and also the 3 euler<br>
                      angles (phi, theta, psi) that defines its
                      orientation.<br>
                      With that, how can I compute the transformation
                      matrix that will allow<br>
                      me to see the small image in the big image, at the
                      right place? I know<br>
                      it's supposed to be fairly simple but I cannot
                      figure it out.<br>
                      <br>
                      Jeremy<br>
                      <br>
                      -- <br>
                      Jeremy Lecoeur, Ph.D.<br>
                      <br>
                      <br>
                      <br>
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                    </blockquote>
                  </div>
                  <br>
                </blockquote>
                <br>
                <br>
              </div>
            </div>
            <font color="#888888">
              <pre cols="72">-- 
Jeremy Lecoeur, Ph.D.
Research Associate
Vanderbilt University
Phone: <a moz-do-not-send="true" href="tel:%2B1%20615%20343%207798" value="+16153437798" target="_blank">+1 615 343 7798</a>
Fax: <a moz-do-not-send="true" href="tel:%2B1%20615%20343%205459" value="+16153435459" target="_blank">+1 615 343 5459</a></pre>
            </font></div>
        </blockquote>
      </div>
      <br>
    </blockquote>
    <br>
    <br>
    <pre class="moz-signature" cols="72">-- 
Jeremy Lecoeur, Ph.D.
Research Associate
Vanderbilt University
Phone: +1 615 343 7798
Fax: +1 615 343 5459</pre>
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