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<p class="MsoNormal">Hello Andrew,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In ITK the result of a registration maps points from the fixed image coordinate system to the moving coordinate system, so T(p_f) = p_m and the TRE is || T(p_f) – p_m||. I suspect you just need to use the inverse transform.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">You may be interested in this SimpleITK notebook (<a href="http://insightsoftwareconsortium.github.io/SimpleITK-Notebooks/Python_html/67_Registration_Semiautomatic_Homework.html)">http://insightsoftwareconsortium.github.io/SimpleITK-Notebooks/Python_html/67_Registration_Semiautomatic_Homework.html)</a>
which has a linked cursor GUI (gui.<span style="font-size:10.0pt;font-family:"Courier New",serif">
</span>RegistrationPointDataAquisition). The source code for the UI is here: <a href="https://github.com/InsightSoftwareConsortium/SimpleITK-Notebooks/blob/master/Python/gui.py">
https://github.com/InsightSoftwareConsortium/SimpleITK-Notebooks/blob/master/Python/gui.py</a> .
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> hope this helps<o:p></o:p></p>
<p class="MsoNormal"> Ziv<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.5pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">Andrew Harris <aharr8@uwo.ca><br>
<b>Date: </b>Wednesday, June 28, 2017 at 3:14 PM<br>
<b>To: </b>Insight-users <insight-users@itk.org><br>
<b>Subject: </b>[ITK-users] [ITK] applying a transform to an ITK Point object results in it moving the opposite direction from the image<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi there, <o:p></o:p></p>
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<p class="MsoNormal">I have been trying for a while to get this working: I want to be able to select corresponding points in a fixed and moving image, and determine how well the moving image is transformed to overlay the fixed image by using target registration
error. The problem is, using the same transform I applied to a moving image that translated it to the left, the point selected in the moving image gets translated to the right for example. <br clear="all">
<o:p></o:p></p>
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<p>--<o:p></o:p></p>
<p>AH<o:p></o:p></p>
<p><o:p> </o:p></p>
<p>Andrew Harris, Honours BSc (Medical Physics)<o:p></o:p></p>
<p>PhD (CAMPEP) & MClSc Candidate<o:p></o:p></p>
<p>-----------------------------------------------------------------------------------------------<o:p></o:p></p>
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