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<p class=MsoNormal align=left style='text-align:left;text-autospace:none'><span
lang=EN-US style='font-size:14.0pt'>I try some cases in Examples\Registration,
and outputs of them can give </span><span lang=EN-US style='font-size:14.0pt;
font-family:NSimSun;color:green'>explicit deformation field, </span><span
lang=EN-US style='font-size:14.0pt'>I am not sure the meaning of deformation
field.<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;text-autospace:none'><span
lang=EN-US style='font-size:14.0pt;font-family:NSimSun'><o:p> </o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;text-autospace:none'><span
lang=EN-US style='font-size:14.0pt;font-family:NSimSun'>In source code of the
cases, there are often existing two lines as follows<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;text-autospace:none'><span
lang=EN-US style='font-size:14.0pt;font-family:NSimSun'><o:p> </o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;text-indent:7.0pt;
text-autospace:none'><span lang=EN-US style='font-size:14.0pt;font-family:NSimSun'> <span
style='color:blue'>typedef</span> itk::Vector< <span style='color:blue'>float</span>,
ImageDimension > VectorType;<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;text-autospace:none'><span
lang=EN-US style='font-size:14.0pt;font-family:NSimSun'> <span
style='color:blue'>typedef</span> itk::Image< VectorType, ImageDimension
> DisplacementFieldType;<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:14.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:14.0pt'>I review ItkSoftwareGuide
in which it is explained as “<b><i>write the deformation field as an
image of vectors</i></b><i>. ” </i>and<i> “<b>Note that the file
format used for writing the deformation field must be capable of representing multiple
components per pixel. This is the case for the MetaImage and VTK file formats
for example.</b>” </i>In page No. 447.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:14.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:14.0pt'>Each pixel in
deformation field has a vector of d dimensional components, whether the
components store the displacements such as a pixel(i,j) under 2D image
coordinates system has 2 components representing the pixel’s position
translation?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:14.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;text-autospace:none'><span
lang=EN-US style='font-size:14.0pt'>Which the suffix of deformation field file should
be if I want the deformation field? With the case of DeformableRegistration4.cxx,
I get a .mha deformationField output file, and find that it is not a 2DX3 image,
but a 2D only.<o:p></o:p></span></p>
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