On 5/4/07, <b class="gmail_sendername">IsabelleNg</b> <<a href="mailto:isabelleNg@homeworking.org">isabelleNg@homeworking.org</a>> wrote:<div><span class="gmail_quote"></span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br>ITK-users,<br><br>I wish to test one of the registration algorithm by applying random<br>transformations to the moving image. This is often done in papers that<br>report registration results as tests of robustness and capture range. Is it
<br>valid to perform these tests by simply initializing the transform with<br>random numbers? i..e by calling<br><br>registration->SetInitialTransformationParameters( randomXform)? </blockquote><div><br>Hi Isabelle<br>
<br>Yes. It is identical. <br></div><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Or, do we actually need to physically write out the randomly misaligned
<br>images and then feed back into the algorithm?<br><br>How would results differ with these 2 approaches?</blockquote><div><br>There wouldn't be a difference. There would be a marginal difference depending on the transform used to resample the moving image before writing to the disk. In the first case, the initial transform is the same as the one used for registration.
<br><br><br>-- <br>Karthik Krishnan<br>R&D Engineer,<br>Kitware Inc. <br></div></div>