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Hi,<br>
Wrong assumption. It's the coordinate of point (0,0) in the
coordinate of the projection image in the word coordinates, it's not
the coordinate of the center of the first pixel. This is mentioned
in the <a href="http://www.openrtk.org/Doxygen/geometry.pdf">geometry
description file</a> on the wiki.<br>
You should not change the mhd parameters. If you want to account for
offset parameters that change from projection to projection, you can
put that offset in the computation of the detector position in world
coordinates.<br>
Simon<br>
<br>
<div class="moz-cite-prefix">On 13/01/2016 13:42, Shiras Abdurahman
wrote:<br>
</div>
<blockquote
cite="mid:CACHVGWPYpjq-F5YcGyhmzDmEjJN0kx62dM30XSXuHrSNA63AdA@mail.gmail.com"
type="cite">
<div dir="ltr">Dear all,
<div><br>
</div>
<div>I am trying to generate geometry xml file with
rtkReg23ProjectionGeometry after decomposing projection
matrix. One of the argument to the function AddReg23Projection
is detector position. I assume that, it is the position vector
of the center of the first pixel in world co-ordinates. This
will be used for computing the projection offset parameters by
projecting detector origin vector onto the u and v axis of the
detector. If that is the case, do we need to change the offset
parameters of each projection in the mhd file. Will this
create problems during displaced detector correction?</div>
<div><br>
</div>
<div><br>
</div>
<div>With regards,</div>
<div>Shiras</div>
<div><br>
</div>
</div>
<br>
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